JP2001086028A - Mobile wireless terminal device and wireless circuit - Google Patents

Abstract

(57) [Problem] To provide a mobile radio terminal device and a radio circuit capable of reducing the size of a circuit and reducing cost. SOLUTION: TDD (Time D) is used for transmission and reception with a base station.
ivision Duplex) system, especially a wireless circuit of a mobile wireless terminal device adopting a transmission loop system for a transmission system,
At the transmission timing, the down converter 102 is used to down-convert the transmission RF signal and generate a transmission loop signal, while at the reception timing, the reception RF signal is used.
This is used for down-converting a signal to a reception IF signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a dual band communication system for performing communication by selectively using two communication bands.
In particular, the present invention relates to a mobile wireless terminal device and a wireless circuit that employ a transmission loop system or a modulation loop system for a transmission circuit using a division duplex system.

[0002]

2. Description of the Related Art As is well known, a radio section of a conventional mobile radio terminal has a configuration as shown in FIG. This mobile radio terminal device is used in a dual band communication system that performs communication by selectively using two communication bands.

First, the reception system will be described. The reception RF signals Rx-A and Rx-B of two communication bands A and B are described.
Are input to the selection unit 101Rx. The selection unit 101Rx is configured to receive the received RF signals Rx-A, Rx-B
Is selected and output to the receiving down converter 102Rx.

The receiving down converter 102Rx converts the received RF signal selected by the selecting means 101Rx into
Using an RF local signal (RF-Lo) generated by a local oscillation circuit (not shown), the signal is down-converted into an IF band signal.

The signal in the IF band down-converted by the receiving down converter 102Rx is supplied to an IF filter 1
03Rx suppresses unnecessary waves, and the gain control amplifier 121
Is input to

The gain control amplifier 121 controls the gain to control the level of the input IF signal.
Here, the level-controlled IF signal is output to a quadrature demodulator (Q
-DEM) 122.

The quadrature demodulator 122 includes a gain control amplifier 12
An IF local signal (IF-Lo) generated by a local oscillator circuit (not shown)
, The received signal Rx-BB (Rx
-I, Rx-Q).

On the other hand, in the transmission system, a quadrature modulator (Q-MO
D) 111 quadrature-modulates the IF local signal (IF-Lo) generated by a local oscillation circuit (not shown) using a baseband transmission signal Tx-BB (Tx-I, Tx-Q). , And generates a transmission IF signal.

The transmission IF generated by the quadrature modulator 111
The phase of the signal is compared by a phase comparator (PD) 113 with an IF local signal for phase comparison from an IF filter 103Tx to be described later. The result of this phase comparison is input to the charge pump (CP) 114.

The charge pump 114 is connected to the phase comparator 11
The current of the phase comparison result of No. 3 is charged to generate a control signal for the transmission loop voltage controlled oscillators 116a and 116b described later. After the unnecessary signal is suppressed by the low-pass filter 115, the control signal is input to the transmission loop voltage control oscillators 116a and 116b as a control signal.

The transmission loop voltage controlled oscillator 116a, 1
16b indicates transmission RF signals Tx-A and Tx-A having frequencies in mutually different bands according to the voltage of the control signal.
Oscillate B. One of these transmission RF signals is selectively input to the transmission down converter 102Tx through the hybrid circuit 101Tx.

The transmission down-converter 102Tx converts the transmission RF signal selectively output from the hybrid circuit 101Tx into an R signal generated by a local oscillation circuit (not shown).
Using the F local signal (RF-Lo), the signal is down-converted into an IF band signal.

The IF band signal down-converted by the transmission down converter 102Tx is supplied to an IF filter 1
03Tx, unnecessary waves are suppressed, and the phase comparator 11
3 is input as an IF local signal for phase comparison.

With the above configuration, the conventional mobile radio terminal can transmit and receive data to and from a base station (not shown) by using T.
The dual band communication has been performed using the DD system and the transmission loop system in the transmission system.

By the way, recently, with the development of circuit integration technology, a portion surrounded by a broken line in FIG. 11 can be integrated into one IC, which contributes to miniaturization of a mobile radio terminal device. ing. However, mobile wireless terminals are required to be further downsized.

[0016]

Conventionally, in a mobile radio terminal device and a radio circuit provided in this device, it is desired to reduce the size of the circuit in order to reduce the size and cost of the mobile radio terminal device. There was a request.

SUMMARY OF THE INVENTION The present invention has been made to meet the above-mentioned demands, and has as its object to provide a mobile radio terminal device and a radio circuit capable of reducing the size of a circuit and reducing costs.

[0018]

In order to achieve the above object, a first invention is used in a dual band communication system for performing communication by selectively using first and second communication bands. , TDD (Ti
In a mobile wireless terminal device that performs wireless communication according to the “me Division Duplex” method, a transmission RF signal and a reception RF signal of two communication bands are input, respectively, and these four R signals are input.
Selecting means for selectively outputting any one of the F signals in accordance with the communication operation of the TDD system; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal; A first branching unit that branches the IF signal obtained by the down-conversion of the conversion unit into two, and an IF signal that has a pass characteristic according to the first communication band and is branched by the first branching unit A first filter that suppresses unnecessary waves from one of the IF signals, and a second filter that has a pass characteristic according to the second communication band and suppresses unnecessary waves from the other of the IF signals branched by the first branching unit. , An IF signal that has passed through each of the first filter and the second filter, a second branching unit that selects one of them, and branches the signal into two, I branched at Demodulation means for performing demodulation processing on one of the signals using a local IF signal, modulation means for performing modulation processing on the local IF signal using an information signal, and modulation obtained by the modulation means Phase comparing means for comparing the phase between the result and the other of the IF signals branched by the second branching means; and transmitting RF signal of the first communication band based on the phase comparison result of the phase comparing means. A first oscillating unit for generating a signal and inputting it to the selecting unit, and a second oscillating unit for generating a transmitting RF signal of the second communication band based on the phase comparison result of the phase comparing unit and inputting the RF signal to the selecting unit And means.

Further, the eleventh invention provides a TDD (Time Division) between a base station of a dual band communication system that performs communication by selectively using the first and second communication bands.
In a wireless circuit for performing wireless communication according to the ion-duplex method, a transmission RF signal of two communication bands and a reception R signal
F signal is input, and any one of these four RF signals is selectively output according to the TDD communication operation, and the RF signal output from this selection means is converted into an IF signal. Frequency converting means for down-converting, first branching means for splitting an IF signal obtained by down-conversion of the frequency converting means into two and outputting the signal to the outside of the radio circuit, and Two IF signals output to the outside are input after unnecessary waves are suppressed, and one of them is selected and
A second branching unit for branching one of the IF signals, a demodulation unit for performing demodulation processing on one of the IF signals branched by the second branching unit using a local IF signal, and a local IF
A modulating means for modulating a signal by using an information signal, a phase comparison between a modulation result obtained by the modulating means and the other of the IF signals branched by the second branching means; And a control signal generating means for generating a control signal for generating an RF signal based on the phase comparison result of the phase comparing means.

In the mobile radio terminal device and the radio circuit having the above-described configurations, the RF signal of the communication band to be used is selectively inputted to the frequency conversion means from the selection means in accordance with the communication operation of the TDD system. Thus, down-conversion of the received RF signal into an IF signal and generation of an IF signal for a transmission loop based on the transmitted RF signal are performed.

Therefore, according to the mobile radio terminal device and the radio circuit having the above configurations, one frequency conversion means
Since the down-conversion of the reception RF signal into the IF signal and the generation of the transmission loop IF signal based on the transmission RF signal are performed, the size of the circuit can be reduced, and the cost can be reduced.

Further, the second invention is used in a dual band communication system for performing communication by selectively using the first and second two communication bands, and TDD (Time) between the system and a base station of the system. In a mobile wireless terminal device that performs wireless communication according to the Division Duplex method, a transmission RF signal and a reception RF signal of two communication bands are input, respectively, and one of these four RF signals is transmitted to a TDD communication. Selecting means for selectively outputting according to the operation, frequency converting means for down-converting the RF signal output from the selecting means to an IF signal, and unnecessary wave from the IF signal obtained by down-converting the frequency converting means , A branching means for branching the IF signal passed through the filter into two, and one of the IF signals branched by the branching means On the other hand, demodulation means for performing demodulation processing using a local IF signal, modulation means for performing modulation processing on a local IF signal using an information signal, a modulation result obtained by this modulation means, Means for comparing a phase with the other of the IF signals branched by the means, and a transmitting RF signal of a first communication band based on the phase comparison result of the phase comparing means, And a second oscillating unit that generates a transmission RF signal of a second communication band based on the phase comparison result of the phase comparing unit and inputs the RF signal to the selecting unit. I did it.

The twelfth aspect of the present invention relates to a TDD (Time Division) between a base station of a dual band communication system that performs communication by selectively using the first and second two communication bands.
In a wireless circuit for performing wireless communication according to the ion-duplex method, a transmission RF signal of two communication bands and a reception R signal
F signal is input, and any one of these four RF signals is selectively output according to the TDD communication operation, and the RF signal output from this selection means is converted into an IF signal. Frequency conversion means for down-converting and outputting to the outside of the radio circuit, and an IF signal output from the frequency conversion means to the outside after the unnecessary waves are suppressed, and the IF signal is branched into two. Branching means for performing demodulation processing using one of the IF signals branched by the branching means using a local IF signal, and performing modulation processing using an information signal with respect to the local IF signal. Modulating means, a phase comparing means for comparing a phase between the modulation result obtained by the modulating means and the other of the IF signals branched by the branching means, and a phase ratio of the phase comparing means. Based on the results, and to be configured by including a control signal generating means for generating a control signal for generating an RF signal.

In the mobile radio terminal device and the radio circuit having the above-described configurations, the RF signal of the communication band to be used is selectively inputted to the frequency conversion means from the selection means in accordance with the communication operation of the TDD system. Then, down-conversion of the received RF signal to an IF signal and generation of an IF signal for a transmission loop based on the transmitted RF signal are performed, and one filter is used to suppress unnecessary waves of these IF signals. ing.

Therefore, according to the mobile radio terminal device and the radio circuit having the above configurations, one frequency conversion means
Down-conversion of the received RF signal to an IF signal and generation of an IF signal for a transmission loop based on the transmitted RF signal can be performed, and one filter suppresses unnecessary waves of the two IF signals. The size can be reduced, and the cost can be reduced.

Further, the third invention is used in a dual-band communication system for performing communication by selectively using the first and second two communication bands, and TDD (Time) between the base station and the system. In a mobile wireless terminal device that performs wireless communication according to the Division Duplex method, a switching oscillation unit that generates a transmission RF signal having a communication band corresponding to a switching signal and a frequency according to a control signal, and the switching oscillation unit includes: A selection unit that receives the generated transmission RF signal and the reception RF signal, and selectively outputs any one of these three RF signals in accordance with the TDD communication operation; Frequency conversion means for down-converting the output RF signal to an IF signal;
A filter for suppressing unnecessary waves from an IF signal obtained by down-conversion of the frequency converting means, a branching means for branching the IF signal passed through the filter into two,
For one of the IF signals branched by this branching means,
Demodulation means for performing demodulation processing using a local IF signal; modulation means for performing modulation processing on the local IF signal using an information signal; modulation results obtained by this modulation means; A phase comparison unit that performs a phase comparison with the other of the branched IF signals; and a control signal generation unit that generates a control signal based on a phase comparison result of the phase comparison unit. did.

According to a thirteenth aspect, a TDD (Time Division) is transmitted to / from a base station of a dual band communication system that performs communication by selectively using the first and second two communication bands.
A transmission RF signal and two reception RF signals are input to a wireless circuit for performing wireless communication according to an ion Duplex method, and any one of the three RF signals is input.
Selecting means for selectively outputting the signal in accordance with the communication operation of the TDD system, frequency converting means for down-converting the RF signal output from the selecting means to an IF signal and outputting the IF signal to the outside of the radio circuit; An IF signal output from the frequency conversion means to the outside, after the unnecessary wave is suppressed, and input, and a branching means for splitting the IF signal into two;
For one of the IF signals branched by this branching means,
Demodulation means for performing demodulation processing using a local IF signal; modulation means for performing modulation processing on the local IF signal using an information signal; modulation results obtained by this modulation means; Phase comparing means for performing a phase comparison with the other of the branched IF signals; and control signal generating means for generating a control signal for generating an RF signal based on a phase comparison result of the phase comparing means. It was made to comprise.

In the mobile radio terminal device and the radio circuit having the above-described configuration, the RF signal of the communication band to be used is selectively inputted to the frequency conversion means from the selection means in accordance with the communication operation of the TDD system. Then, down-conversion of the received RF signal to an IF signal and generation of an IF signal for a transmission loop based on the transmitted RF signal are performed, and one filter is used to suppress unnecessary waves of these IF signals. ing.

In the mobile radio terminal having the above configuration, only one means for generating an RF signal (switching oscillation means) is provided to generate RF signals of two communication bands.

Therefore, according to the mobile radio terminal device and the radio circuit having the above configurations, one frequency converting means
The mobile radio terminal is capable of down-converting a received RF signal to an IF signal and generating an IF signal for a transmission loop based on the transmitted RF signal, and suppressing unnecessary waves of the two IF signals with one filter. Since the apparatus has only one means for generating an RF signal, the size of the circuit can be reduced and the cost can be reduced.

Further, the fourth invention is used for a dual band communication system for performing communication by selectively using the first and second two communication bands, and the TDD (TDD) is used between the system and a base station of the system. In a mobile wireless terminal device that performs wireless communication according to the Time Division Duplex method, a transmission RF signal and a reception RF signal of two communication bands are input, and one of these four RF signals is transmitted to a TD.
Selection means for selectively outputting in accordance with the D-system communication operation, frequency conversion means for down-converting the RF signal output from the selection means into an IF signal, and IF obtained by down-conversion of the frequency conversion means A filter that suppresses unnecessary waves from signals and differentially outputs two IF signals having phases opposite to each other, and demodulates one of the differential outputs obtained by this filter using a local IF signal. Demodulation means for performing
Modulation means for performing a modulation process using an information signal, a modulation result obtained by this modulation means, and a phase comparison means for performing a phase comparison between the other of the differential output obtained by the filter,
Based on the phase comparison result of the phase comparison unit, a transmission RF signal of the first communication band is generated, and the first oscillation unit is input to the selection unit. And a second oscillating means for generating a transmission RF signal of the communication band of (1) and inputting the generated signal to the selecting means.

Also, a fourteenth aspect of the present invention relates to the first and second aspects.
TDD (Time Div.) Between a base station of a dual band communication system that performs communication by selectively using one communication band.
In a wireless circuit for performing wireless communication by an ision duplex method, a transmission RF signal and a reception RF signal of two communication bands are respectively input, and one of these four RF signals is transmitted to a TDD communication. Selecting means for selectively outputting the signal in accordance with the operation; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal and outputting the signal to the outside of the radio circuit; The output IF signal is input as two differential outputs having phases opposite to each other after unnecessary waves are suppressed. One of these differential outputs is subjected to demodulation processing using a local IF signal. Demodulating means for performing modulation processing on the local IF signal using the information signal, and a modulation result obtained by the modulation means and the other of the differential output. A phase comparison means for performing phase comparison,
A control signal generator for generating a control signal for generating an RF signal based on the phase comparison result of the phase comparator is provided.

In the mobile radio terminal device and the radio circuit having the above-described configurations, the RF signal of the communication band to be used is selectively inputted to the frequency conversion means from the selection means in accordance with the communication operation of the TDD system. Then, down-conversion of the received RF signal to an IF signal and generation of an IF signal for a transmission loop based on the transmitted RF signal are performed, and a single filter is used to suppress unnecessary waves of these IF signals. Receive the two differential outputs of the filter
It is used as a signal and an IF signal for a transmission loop.

Therefore, according to the mobile radio terminal device and the radio circuit having the above configuration, one frequency conversion means
It can down-convert a received RF signal to an IF signal and generate an IF signal for a transmission loop based on the transmitted RF signal, and further suppresses unnecessary waves of the two IF signals with one filter. Since the two differential outputs are used as a reception IF signal and an IF signal for a transmission loop, no branching unit is required, the size of the circuit can be reduced, and the cost can be reduced.

According to a fifth aspect of the present invention, in the first to fourth aspects, there is provided a transmission filter for suppressing transmission spurious from the modulation result obtained by the modulation means, and the phase comparison means modulates the transmission spurious. The phase comparison between the result and the output of the filter is performed. According to the mobile wireless terminal device having this configuration, even if a transmission spurious is generated in the modulation result obtained by the modulation unit, it can be suppressed.

The mobile radio terminal according to the sixth aspect of the present invention is the mobile radio terminal according to the first aspect of the present invention, wherein the modulating means modulates the local IF signal instead of the second branch. In the mobile radio terminal device according to the first aspect of the present invention, the phase comparison means compares the phase of the IF signal branched by the second branching means with the IF signal branched by the second branching means. Instead of this, the phase is compared with the local IF signal.

In the mobile radio terminal according to the sixth aspect of the present invention having the above-described configuration, the reception frequency can be changed by one frequency conversion means, similarly to the mobile radio terminal according to the first aspect.
Since the down conversion of the F signal to the IF signal and the generation of the transmission loop IF signal based on the transmission RF signal are performed, the size of the circuit can be reduced and the cost can be reduced.

The mobile radio terminal according to the seventh aspect of the present invention is the mobile radio terminal according to the second aspect of the present invention, wherein the modulating means modulates the local IF signal instead of the second branch. In the mobile radio terminal device according to the second aspect of the present invention, the phase of the IF signal branched by the second branching means is compared with the phase of the IF signal branched by the second branching means. Instead of this, the phase is compared with the local IF signal.

Even in the mobile radio terminal according to the seventh aspect of the present invention having the above-mentioned configuration, the reception frequency can be reduced by one frequency conversion means, similarly to the mobile radio terminal according to the second aspect.
Since the down-conversion of the F signal to the IF signal and the generation of the IF signal for the transmission loop based on the transmission RF signal can be performed, and one filter suppresses the unnecessary waves of the two IF signals, the circuit size is large. And cost can be reduced.

The mobile radio terminal according to the eighth aspect of the present invention is the mobile radio terminal according to the third aspect of the present invention, wherein the modulating means modulates the local IF signal instead of the second branch. In the mobile radio terminal device according to the third aspect of the present invention, the phase comparison means compares the phase of the IF signal branched by the second branching means with the IF signal branched by the second branching means. Instead of this, the phase is compared with the local IF signal.

In the mobile radio terminal device according to the eighth aspect of the present invention having the above-described structure, the reception frequency can be reduced by one frequency conversion means, similarly to the mobile radio terminal device according to the third aspect.
Down-conversion of the F signal into an IF signal and generation of an IF signal for a transmission loop based on the transmission RF signal can be performed, and one filter suppresses unnecessary waves of the two IF signals and further reduces the RF signal. Since only one generating unit is provided, the size of the circuit can be reduced and the cost can be reduced.

The mobile radio terminal according to the ninth aspect of the present invention is the mobile radio terminal according to the fourth aspect of the present invention, wherein the modulating means modulates the local IF signal instead of the second branch. In the mobile radio terminal device according to the fourth aspect of the present invention, the phase comparison means compares the phase of the IF signal branched by the second branching means with the IF signal branched by the second branching means. Instead of this, the phase is compared with the local IF signal.

In the mobile radio terminal according to the ninth aspect of the present invention having the above-described structure, the reception R is obtained by one frequency conversion means, similarly to the mobile radio terminal of the fourth aspect.
Down-conversion of the F signal to an IF signal and generation of an IF signal for a transmission loop based on the transmission RF signal can be performed, and one filter suppresses unnecessary waves of the two IF signals. Since the two differential outputs are used as the reception IF signal and the transmission loop IF signal, respectively, no branching unit is required, the size of the circuit can be reduced, and the cost can be reduced.

According to a tenth aspect, in the sixth to ninth aspects, there is provided a transmission filter for suppressing transmission spurious from a modulation result obtained by the modulation means, and the phase comparison means transmits the modulated signal having passed the transmission filter. The phase comparison between the result and the output of the filter is performed. According to the mobile wireless terminal device having this configuration, even if a transmission spurious is generated in the modulation result obtained by the modulation unit, it can be suppressed.

A wireless circuit according to a fifteenth aspect of the present invention comprises:
In the radio circuit according to the eleventh aspect, the modulating means modulates the IF signal branched by the second branching means instead of modulating the local IF signal.
In the radio circuit according to the eleventh aspect, the phase comparison unit compares the phase with the local IF signal instead of comparing the phase with the IF signal branched by the second branching unit. is there.

In the radio circuit according to the fifteenth aspect of the present invention having the above-described configuration, similarly to the radio circuit according to the eleventh aspect, the IF conversion of the received RF signal is performed by one frequency conversion means.
Since the signal is down-converted and the transmission loop IF signal is generated based on the transmission RF signal, the size of the circuit can be reduced and the cost can be reduced.

Further, a radio circuit according to a sixteenth aspect of the present invention comprises:
In the radio circuit according to the twelfth aspect, the modulation unit modulates the IF signal branched by the second branching unit instead of modulating the local IF signal.
In the wireless circuit according to the twelfth aspect, the phase comparison means compares the phase with the local IF signal instead of comparing the phase with the IF signal branched by the second branch means. is there.

In the wireless circuit according to the sixteenth aspect of the present invention, similarly to the wireless circuit according to the twelfth aspect, one frequency converting means uses the IF of the received RF signal.
It is possible to downconvert to a signal and generate an IF signal for a transmission loop based on a transmission RF signal, and to suppress unnecessary waves of the two IF signals with one filter. And cost can be reduced.

The radio circuit according to a seventeenth aspect of the present invention comprises:
In the wireless circuit according to the thirteenth aspect, the modulating means modulates the IF signal branched by the second branching means instead of modulating the local IF signal.
In the wireless circuit according to the thirteenth aspect, the phase comparison means compares the phase with the local IF signal instead of comparing the phase with the IF signal branched by the second branch means. is there.

In the wireless circuit according to the seventeenth aspect of the present invention, similarly to the wireless circuit according to the thirteenth aspect, the IF conversion of the received RF signal is performed by one frequency converter.
It is possible to downconvert to a signal and generate an IF signal for a transmission loop based on a transmission RF signal, and to suppress unnecessary waves of the two IF signals with one filter. And cost can be reduced.

Further, the wireless circuit according to the eighteenth aspect of the present invention
In the radio circuit according to the fourteenth aspect, the modulating means modulates the IF signal branched by the second branching means instead of modulating the local IF signal.
In the radio circuit according to the fourteenth aspect, the phase comparison means compares the phase with the local IF signal instead of comparing the phase with the IF signal branched by the second branch means. is there.

In the radio circuit according to the eighteenth aspect of the present invention having the above-described configuration, similarly to the radio circuit according to the fourteenth aspect, one frequency conversion means uses the IF of the received RF signal.
A signal can be down-converted and an IF signal for a transmission loop can be generated based on a transmission RF signal, and the unnecessary waves of the two IF signals can be suppressed by one filter. Since each of the two differential outputs is used as a reception IF signal and an IF signal for a transmission loop, no branching unit is required, and the circuit size and cost can be reduced.

[0053]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a radio section of a mobile radio terminal according to the present invention will be described. FIG. 1 shows a configuration of a radio unit of a mobile radio terminal device according to a first embodiment of the present invention.

In the following description, a dual mode machine corresponding to both a pan-European digitized mobile communication system (hereinafter, referred to as GSM) and a digital cellular system 1800 (hereinafter, referred to as DCS 1800) will be described. This will be described using an example.

The radio section includes a selection means 101, a transmission / reception down converter 102, an IF filter 103-
1, 103-2, branching means 105, and branching means 106
, A gain control amplifier 121, and a quadrature demodulator (Q-DE
M) 122, quadrature modulator (Q-MOD) 111, phase comparator (PD) 113, charge pump (CP) 1
14, a low-pass filter 115, and voltage control oscillators 116a and 116b for the transmission loop.

The received RF signals R of the two communication bands A and B
xA, Rx-B, and a transmission RF signal Tx generated by transmission loop voltage controlled oscillators 116a, 116b described later.
−A, Tx−B are input to the selection means 101.

The communication band A is a communication band corresponding to GSM, and the transmission RF signal Tx-A is 880-915.
[MHz], the received RF signal Rx-A is 925-960.
[MHz].

On the other hand, communication band B is a communication band corresponding to DCS1800, and transmission RF signal Tx-B is 1710
At 1785 [MHz], the received RF signal Rx-B is 180
It is 5 to 1880 [MHz]. Also, the intermediate frequency is
Both systems transmit and receive signals at 246 [MHz] inside the circuit.

The selection means 101 is a base station (not shown)
In order to perform communication by the TDD method between the receiving RF signal Rx-A and the receiving RF signal Rx-B, the transmitting RF signal Tx-A,
One of the signals Tx-B is selected and output to down-converter 102 for both transmission and reception.

The transmitting / receiving downconverter 102 converts the RF signal selected by the selecting means 101 into an RF local signal (RF-to-RF) generated by a local oscillation circuit (not shown).
Using Lo), the signal is down-converted into an IF band signal.

The IF band signal obtained by the down-conversion of the transmission / reception down-converter 102 is
05, the IF filter 103-1, 1
03-2.

The IF filter 103-1 has characteristics corresponding to GSM, while the IF filter 103-2 has
CS1800 has characteristics corresponding to CS1800, and also suppresses unnecessary waves of IF band signals branched by branching means 105,
The result is output to the branching unit 106.

When operating in GSM, the branching unit 106 branches the output of the IF filter 103-1.
When operating with the DCS 1800, the IF filter 10
The output of 3-2 is branched. And the I branched here
The F-band signal is output to the gain control amplifier 121 during reception, and is output to the phase comparator 113 during transmission.

The gain control amplifier 121 controls the gain to control the level of the input IF band signal. Here, the level-controlled IF band signal is input to a quadrature demodulator (Q-DEM) 122.

The quadrature demodulator 122 is connected to the gain control amplifier 12
1 is converted into an IF local signal (IF-L) generated by a local oscillation circuit (not shown).
o), the baseband received signal Rx-BB
(Rx-I, Rx-Q) to perform quadrature demodulation.

The quadrature modulator 111 outputs an IF local signal (IF-Lo) generated by a local oscillation circuit (not shown).
To the baseband transmission signal Tx-BB (Tx-I,
Tx-Q) and transmit I for phase comparison
Generate an F signal.

Transmission IF generated by quadrature modulator 111
The signal is converted by the phase comparator 113 into the aforementioned branching means 106.
Is compared with the phase of the IF band signal. This phase comparison result is used as a phase detection signal by the charge pump 11.
4 is input.

The charge pump 114 is connected to the phase comparator 11
The current of the phase detection signal of No. 3 is charged to generate a control signal for the transmission loop voltage controlled oscillators 116a and 116b described later. This control signal is smoothed by a low-pass filter 115, and then transmitted by a voltage control oscillator 116
a and 116b are input as control signals.

Transmission loop voltage controlled oscillator 116a, 1
16b is a transmission R of a frequency corresponding to the voltage of the control signal.
Oscillates F signals Tx-A and Tx-B. These transmissions R
The F signal is input to the above-described selection means 101. In addition,
The selecting means 101 is constituted by a semiconductor switch,
The broken line in the figure is to be integrated on one IC.

Next, a description will be given of the transmission / reception operation of the radio circuit of the mobile radio terminal having the above-described configuration by the TDD system.
First, the operation at the time of GSM transmission will be described. GSM
When transmitting, the selecting means 101 selects the GSM transmission RF
The signal Tx-A is selected and the transmission / reception downconverter 1 is selected.
02 is output.

The transmission / reception down converter 102 converts the transmission RF signal Tx-A (880 to 915 [MHz]) into R
F local signal RF-Lo (1126 to 1161 [MH
z]) and the IF band signal (246 [MH]
z]).

Then, this down-converted IF
The band signal is split into two by the splitting means 105,
Output to filters 103-1 and 103-2. In the branching unit 106, the IF band signal (246 [MHz]) in which the unnecessary wave is suppressed by the IF filter 103-1 is branched and output to the gain control amplifier 121, and the phase comparator 113 as a transmission loop signal. Is input to At the time of this transmission, the gain control amplifier 121 is in an operation stop state.

In the quadrature modulator 111, the baseband transmission signal Tx-BB (Tx-I, Tx-Q) is converted into an IF band (246) by an IF local signal (IF-Lo).
[MHz]) and the transmission IF for phase comparison
The signal is output to the phase comparator 113.

The phase comparator 113 compares the phase of the transmission loop signal (246 [MHz]) from the branching means 106 with the phase of the transmission IF signal (246 [MHz]) for phase comparison. It is detected as a phase detection signal.

The charge pump 114 charges the current of the phase detection signal, performs charging and discharging, and generates a control signal for the transmission loop voltage controlled oscillator 116a. This control signal is smoothed by the low-pass filter 115 and then input to the transmission loop voltage controlled oscillator 116a.

The transmission loop voltage control oscillator 116a generates a transmission RF signal Tx-A of 880 to 915 [MHz] according to the voltage of the control signal smoothed by the low-pass filter 115.

Next, the operation of the DCS 1800 at the time of transmission will be described. When transmitting the DCS 1800, the selecting unit 101 selects the transmission RF signal Tx-B of the DCS 1800 and outputs it to the transmission / reception down converter 102.

The transmission / reception down converter 102 transmits the transmission RF signal Tx-B (1710 to 1785 [MHz]).
To the RF local signal RF-Lo (1956-2031).
[MHz]) and the IF band signal (246).
[MHz]).

Then, this down-converted IF
The band signal is split into two by the splitting means 105,
Output to filters 103-1 and 103-2. In the branching unit 106, the IF band signal (246 [MHz]) in which the unnecessary wave is suppressed by the IF filter 103-2 is branched and output to the gain control amplifier 121, and the phase comparator 113 as a transmission loop signal. Is input to At the time of this transmission, the gain control amplifier 121 is in an operation stop state.

In the quadrature modulator 111, the baseband transmission signal Tx-BB (Tx-I, Tx-Q) is converted into an IF band (246) by an IF local signal (IF-Lo).
[MHz]) and the transmission IF for phase comparison
The signal is output to the phase comparator 113.

The phase comparator 113 compares the phase of the transmission loop signal (246 [MHz]) from the branching means 106 with the phase of the transmission IF signal (246 [MHz]) for phase comparison. It is detected as a phase detection signal.

The charge pump 114 charges and discharges the current of the phase detection signal to generate a control signal for the transmission loop voltage control oscillator 116b. The control signal is smoothed by the low-pass filter 115 and then input to the transmission loop voltage control oscillator 116b.

In the transmission loop voltage control oscillator 116b, the transmission R of 1710 to 1785 [MHz] is determined according to the voltage of the control signal smoothed by the low-pass filter 115.
An F signal Tx-B is generated.

Next, the operation at the time of GSM reception will be described. At the time of receiving GSM, the selecting means 101 selects GS
The M received RF signals Rx-A are selected and output to the transmitting / receiving downconverter 102.

The transmission / reception downconverter 102 converts the received RF signal Rx-A (925 to 960 [MHz]) into R
F local signal RF-Lo (1171-1206 [MH
z]) and the IF band signal (246 [MH]
z]).

The down-converted IF
The band signal is split into two by the splitting means 105,
Output to filters 103-1 and 103-2. In the branching unit 106, the IF band signal (246 [MHz]) in which unnecessary waves are suppressed by the IF filter 103-1 is branched and input to the gain control amplifier 121 and the phase comparator 113. At the time of this reception, the transmission system is in an operation stop state.

The gain control amplifier 121 controls the gain, controls the level of the IF band signal input from the branching means 106, and inputs the signal to the quadrature demodulator 122. In the quadrature demodulator 122, an IF band signal (246 [MHz]) whose level is controlled by the gain control amplifier 121.
Is the IF local signal IF-Lo (246 [MHz])
And the baseband received signal Rx−
Quadrature demodulation is performed on BB (Rx-I, Rx-Q).

Next, the operation of the DCS 1800 at the time of reception will be described. When receiving the DCS 1800, the selecting unit 101 selects the received RF signal Rx-B of the DCS 1800 and outputs it to the transmission / reception down converter 102.

The transmitting / receiving down converter 102 receives the RF signal Rx-B (1805-1880 [MHz]).
Is converted to an RF local signal RF-Lo (2051-2126).
[MHz]) and the IF band signal (246).
[MHz]).

Then, this down-converted IF
The band signal is split into two by the splitting means 105,
Output to filters 103-1 and 103-2. In the branching unit 106, the IF band signal (246 [MHz]) in which the unnecessary wave is suppressed by the IF filter 103-2 is branched and input to the gain control amplifier 121 and the phase comparator 113. At the time of this reception, the transmission system is in an operation stop state.

The gain control amplifier 121 controls the gain to control the level of the IF band signal input from the branching means 106, and inputs the signal to the quadrature demodulator 122. In the quadrature demodulator 122, an IF band signal (246 [MHz]) whose level is controlled by the gain control amplifier 121.
Is the IF local signal IF-Lo (246 [MHz])
And the baseband received signal Rx−
Quadrature demodulation is performed on BB (Rx-I, Rx-Q).

As described above, in the wireless circuit having the above configuration,
At the transmission timing, the down converter 102 is used to down-convert the transmission RF signal to generate a transmission loop signal, while at the reception timing, it is used to down-convert the reception RF signal to the reception IF signal. I have.

Therefore, according to the radio circuit having the above configuration, the generation of the transmission loop signal and the down-conversion of the received RF signal can be performed by one down converter 102, so that the radio circuit can be simplified and reduced in size. Thus, manufacturing costs can be reduced.

Further, in the wireless circuit having the above configuration, two I
Since the F filters 103-1 and 103-2 are provided, the system to be used (GSM or DCS
1800), it is possible to use IF filters having different filter characteristics.

The present invention is not limited to the above embodiment. For example, in the above embodiment, quadrature modulator 111 transmits baseband transmission signal Tx−
The IF local signal is used to generate a transmission IF signal for phase comparison using BB, and the phase comparator 113
The transmission loop signal from the branching unit 106 is used for phase comparison with the transmission IF signal for phase comparison.

On the other hand, for example, as shown in FIG.
The quadrature modulator 111 uses the transmission loop signal from the branching unit 106 to generate a transmission IF signal for phase comparison using the baseband transmission signal Tx-BB, and the phase comparator 113 A similar effect can be obtained by using an IF local signal for phase comparison with a transmission IF signal for transmission.

Next, the radio section of the mobile radio terminal according to the second embodiment of the present invention will be described.
This shows the configuration. In the following description, as in the first embodiment, a dual mode device corresponding to both the GSM and DCS1800 systems will be described as an example.

This radio section includes a selecting means 101, a transmitting / receiving down converter 102, an IF filter 103,
Branching means 104, gain control amplifier 121, quadrature demodulator (Q-DEM) 122, quadrature modulator (Q-MOD)
111, a phase comparator (PD) 113, a charge pump (CP) 114, a low-pass filter 115, and voltage control oscillators 116a and 116b for a transmission loop.

The received RF signals R of the two communication bands A and B
xA, Rx-B, and a transmission RF signal Tx generated by transmission loop voltage controlled oscillators 116a, 116b described later.
−A, Tx−B are input to the selection means 101.

Communication band A is a communication band corresponding to GSM, and transmission RF signal Tx-A is 880-915.
[MHz], the received RF signal Rx-A is 925-960.
[MHz].

On the other hand, the communication band B is a communication band corresponding to the DCS1800, and the transmission RF signal Tx-B is 1710
At 1785 [MHz], the received RF signal Rx-B is 180
It is 5 to 1880 [MHz]. Also, the intermediate frequency is
Both systems transmit and receive signals at 246 [MHz] inside the circuit.

The selecting means 101 is a base station (not shown)
In order to perform communication by the TDD method between the receiving RF signal Rx-A and the receiving RF signal Rx-B, the transmitting RF signal Tx-A,
One of the signals Tx-B is selected and output to down-converter 102 for both transmission and reception.

The transmitting / receiving downconverter 102 converts the RF signal selected by the selecting means 101 into an RF local signal (RF-to-RF) generated by a local oscillation circuit (not shown).
Using Lo), the signal is down-converted into an IF band signal.

[0104] The IF band signal obtained by the down-conversion of the transmission / reception down-converter 102 is output to the IF filter 103. The IF filter 103
Unnecessary waves in the F-band signal are suppressed, and the
4 is output.

The branching means 104 branches the output of the IF filter 103, and the signal of the IF band branched here is output to the gain control amplifier 121 at the time of reception, and is output to the phase comparator 113 at the time of transmission.

The gain control amplifier 121 controls the gain to control the level of the input IF band signal. Here, the level-controlled IF band signal is input to a quadrature demodulator (Q-DEM) 122.

The quadrature demodulator 122 includes the gain control amplifier 12
1 is converted into an IF local signal (IF-L) generated by a local oscillation circuit (not shown).
o), the baseband received signal Rx-BB
(Rx-I, Rx-Q) to perform quadrature demodulation.

The quadrature modulator 111 outputs an IF local signal (IF-Lo) generated by a local oscillation circuit (not shown).
To the baseband transmission signal Tx-BB (Tx-I,
Tx-Q) and transmit I for phase comparison
Generate an F signal.

Transmission IF generated by quadrature modulator 111
The signal is converted by the phase comparator 113 into the aforementioned branching means 104.
Is compared with the phase of the IF band signal. This phase comparison result is used as a phase detection signal by the charge pump 11.
4 is input.

The charge pump 114 is connected to the phase comparator 11
The current of the phase detection signal of No. 3 is charged to generate a control signal for the transmission loop voltage controlled oscillators 116a and 116b described later. This control signal is smoothed by a low-pass filter 115, and then transmitted through a voltage control oscillator 116 for a transmission loop.
a and 116b are input as control signals.

Transmission loop voltage controlled oscillator 116a, 1
16b is a transmission R of a frequency corresponding to the voltage of the control signal.
Oscillates F signals Tx-A and Tx-B. These transmissions R
The F signal is input to the above-described selection means 101. In addition,
The selecting means 101 is constituted by a semiconductor switch,
The broken line in the figure is to be integrated on one IC.

Next, a description will be given of the transmission / reception operation of the radio circuit of the mobile radio terminal having the above-described configuration by the TDD method.
First, the operation at the time of GSM transmission will be described. GSM
When transmitting, the selecting means 101 selects the GSM transmission RF
The signal Tx-A is selected and the transmission / reception downconverter 1 is selected.
02 is output.

The transmission / reception down converter 102 converts the transmission RF signal Tx-A (880 to 915 [MHz]) into R
F local signal RF-Lo (1126 to 1161 [MH
z]) and the IF band signal (246 [MH]
z]), and outputs the result to the IF filter 103.

In the branching means 104, the IF filter 103
Signal in the IF band (246 [MH]
z]) is branched and output to the gain control amplifier 121 and input to the phase comparator 113 as a transmission loop signal. At the time of this transmission, the gain control amplifier 121 is in an operation stop state.

In the quadrature modulator 111, the baseband transmission signal Tx-BB (Tx-I, Tx-Q) is converted into an IF band (246) by an IF local signal (IF-Lo).
[MHz]) and the transmission IF for phase comparison
The signal is output to the phase comparator 113.

The phase comparator 113 compares the phase of the transmission loop signal (246 [MHz]) from the branching means 104 with the phase of the transmission IF signal (246 [MHz]) for phase comparison. It is detected as a phase detection signal.

The charge pump 114 charges the current of the phase detection signal, performs charging and discharging, and generates a control signal for the transmission loop voltage control oscillator 116a. This control signal is smoothed by the low-pass filter 115 and then input to the transmission loop voltage controlled oscillator 116a.

The transmission loop voltage control oscillator 116a generates a transmission RF signal Tx-A of 880 to 915 [MHz] according to the voltage of the control signal smoothed by the low-pass filter 115.

Next, the operation of DCS 1800 at the time of transmission will be described. When transmitting the DCS 1800, the selecting unit 101 selects the transmission RF signal Tx-B of the DCS 1800 and outputs it to the transmission / reception down converter 102.

The transmission / reception downconverter 102 transmits the transmission RF signal Tx-B (1710 to 1785 [MHz]).
To the RF local signal RF-Lo (1956-2031).
[MHz]) and the IF band signal (246).
[MHz]) and the IF filter 10
Output to 3.

In the branching means 104, the IF filter 103
Signal in the IF band (246 [MH]
z]) is branched and output to the gain control amplifier 121 and input to the phase comparator 113 as a transmission loop signal. At the time of this transmission, the gain control amplifier 121 is in an operation stop state.

In quadrature modulator 111, baseband transmission signal Tx-BB (Tx-I, Tx-Q) is converted to IF band (246) by IF local signal (IF-Lo).
[MHz]) and the transmission IF for phase comparison
The signal is output to the phase comparator 113.

The phase comparator 113 compares the phase of the transmission loop signal (246 [MHz]) from the branching means 104 with the phase of the transmission IF signal (246 [MHz]) for phase comparison. It is detected as a phase detection signal.

The charge pump 114 charges and discharges the current of the phase detection signal to generate a control signal for the transmission loop voltage control oscillator 116b. The control signal is smoothed by the low-pass filter 115 and then input to the transmission loop voltage control oscillator 116b.

In the transmission loop voltage control oscillator 116b, the transmission R of 1710 to 1785 [MHz] is determined according to the voltage of the control signal smoothed by the low-pass filter 115.
An F signal Tx-B is generated.

Next, the operation at the time of GSM reception will be described. At the time of receiving GSM, the selecting means 101 selects GS
The M received RF signals Rx-A are selected and output to the transmitting / receiving downconverter 102.

The transmission / reception down converter 102 converts the received RF signal Rx-A (925 to 960 [MHz]) into R
F local signal RF-Lo (1171-1206 [MH
z]) and the IF band signal (246 [MH]
z]), and outputs the result to the IF filter 103.

In the branching means 104, the IF filter 103
Signal in the IF band (246 [MH]
z]) is branched and input to the gain control amplifier 121 and the phase comparator 113. At the time of this reception, the transmission system is in an operation stop state.

The gain control amplifier 121 controls the gain, controls the level of the IF band signal input from the branching unit 104, and inputs the signal to the quadrature demodulator 122. In the quadrature demodulator 122, an IF band signal (246 [MHz]) whose level is controlled by the gain control amplifier 121.
Is the IF local signal IF-Lo (246 [MHz])
And the baseband received signal Rx−
Quadrature demodulation is performed on BB (Rx-I, Rx-Q).

Next, the operation of the DCS 1800 at the time of reception will be described. When receiving the DCS 1800, the selecting unit 101 selects the received RF signal Rx-B of the DCS 1800 and outputs it to the transmission / reception down converter 102.

The transmission / reception down converter 102 receives the RF signal Rx-B (1805-1880 [MHz]).
Is converted to an RF local signal RF-Lo (2051-2126).
[MHz]) and the IF band signal (246).
[MHz]) and the IF filter 10
Output to 3.

In the branching means 104, the IF filter 103
Signal in the IF band (246 [MH]
z]) is branched and input to the gain control amplifier 121 and the phase comparator 113. At the time of this reception, the transmission system is in an operation stop state.

The gain control amplifier 121 controls the gain, controls the level of the IF band signal input from the branching means 104, and inputs the signal to the quadrature demodulator 122. In the quadrature demodulator 122, an IF band signal (246 [MHz]) whose level is controlled by the gain control amplifier 121.
Is the IF local signal IF-Lo (246 [MHz])
And the baseband received signal Rx−
Quadrature demodulation is performed on BB (Rx-I, Rx-Q).

As described above, in the wireless circuit having the above configuration,
At the transmission timing, the down converter 102 is used to down-convert the transmission RF signal to generate a transmission loop signal, while at the reception timing, it is used to down-convert the reception RF signal to the reception IF signal. I have.

Therefore, according to the radio circuit having the above configuration, the generation of the transmission loop signal and the down-conversion of the reception RF signal can be performed by one down converter 102, so that the radio circuit can be simplified and reduced in size. Thus, manufacturing costs can be reduced.

In the wireless circuit having the above configuration, one I
Since the F filter 103 suppresses unnecessary waves of the transmission loop signal and the reception IF signal, it is possible to further simplify and reduce the size of the radio circuit and reduce the manufacturing cost.

Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, quadrature modulator 111 transmits baseband transmission signal Tx−
The IF local signal is used to generate a transmission IF signal for phase comparison using BB, and the phase comparator 113
The transmission loop signal from the branching means 104 is used for phase comparison with the transmission IF signal for phase comparison.

In contrast, for example, as shown in FIG.
The quadrature modulator 111 uses the transmission loop signal from the branching unit 104 to generate a transmission IF signal for phase comparison using the baseband transmission signal Tx-BB, and the phase comparator 113 A similar effect can be obtained by using an IF local signal for phase comparison with a transmission IF signal for transmission.

If transmission spurious becomes a problem, an IF filter 112 may be provided between the quadrature modulator 111 and the phase comparator 113 as shown in FIG. Thus, unnecessary waves included in the transmission IF signal can be suppressed.

Further, in the case of the configuration shown in FIG. 4, when transmission spurious becomes a problem, as shown in FIG.
An IF filter 112 may be provided between the quadrature modulator 111 and the phase comparator 113. This allows
Unwanted waves included in the transmission IF signal can be suppressed.

Next, the radio section of the mobile radio terminal according to the third embodiment of the present invention will be described.
This shows the configuration. In the following description, as in the first embodiment, a dual mode device corresponding to both the GSM and DCS1800 systems will be described as an example.

The radio section includes a selecting means 101, a transmitting / receiving down converter 102, an IF filter 103,
Branching means 104, gain control amplifier 121, quadrature demodulator (Q-DEM) 122, quadrature modulator (Q-MOD)
111, a phase comparator (PD) 113, a charge pump (CP) 114, a low-pass filter 115, and a switching voltage controlled oscillator (Sw-VCO) 116.

The received RF signals R of the two communication bands A and B
xA and Rx-B and a transmission RF signal Tx-RF (one of transmission RF signals Tx-A and Tx-B) generated by a switching voltage controlled oscillator 116 described later are input to the selection unit 101. You.

Communication band A is a communication band corresponding to GSM, and transmission RF signal Tx-A is 880-915.
[MHz], the received RF signal Rx-A is 925-960.
[MHz].

On the other hand, the communication band B is a communication band corresponding to the DCS1800, and the transmission RF signal Tx-B is 1710
At 1785 [MHz], the received RF signal Rx-B is 180
It is 5 to 1880 [MHz]. Also, the intermediate frequency is
Both systems transmit and receive signals at 246 [MHz] inside the circuit.

The selection means 101 is a base station (not shown)
In order to perform communication by the TDD method between the receiving RF signal Rx-A and the receiving RF signal Rx-B, the transmitting RF signal Tx-RF,
, One of the signals is selected and output to the transmission / reception downconverter 102.

The transmitting / receiving down converter 102 converts the RF signal selected by the selecting means 101 into an RF local signal (RF-to-RF) generated by a local oscillation circuit (not shown).
Using Lo), the signal is down-converted into an IF band signal.

The IF band signal obtained by down-conversion of the transmission / reception down-converter 102 is output to the IF filter 103. The IF filter 103
Unnecessary waves in the F-band signal are suppressed, and the
4 is output.

The branching means 104 branches the output of the IF filter 103. The IF band signal branched here is output to the gain control amplifier 121 at the time of reception, and is output to the phase comparator 113 at the time of transmission.

The gain control amplifier 121 controls the gain to control the level of the input IF band signal. Here, the level-controlled IF band signal is input to a quadrature demodulator (Q-DEM) 122.

The quadrature demodulator 122 includes the gain control amplifier 12
1 is converted into an IF local signal (IF-L) generated by a local oscillation circuit (not shown).
o), the baseband received signal Rx-BB
(Rx-I, Rx-Q) to perform quadrature demodulation.

The quadrature modulator 111 outputs an IF local signal (IF-Lo) generated by a local oscillation circuit (not shown).
To the baseband transmission signal Tx-BB (Tx-I,
Tx-Q) and transmit I for phase comparison
Generate an F signal.

Transmission IF generated by quadrature modulator 111
The signal is converted by the phase comparator 113 into the aforementioned branching means 104.
Is compared with the phase of the IF band signal. This phase comparison result is used as a phase detection signal by the charge pump 11.
4 is input.

The charge pump 114 is connected to the phase comparator 11
The current of the phase detection signal of No. 3 is charged to generate a control signal for the transmission loop voltage controlled oscillators 116a and 116b described later. This control signal is smoothed by a low-pass filter 115,
Is input as a control signal.

The switching voltage control oscillator 116 generates an RF signal of a communication band according to a switching signal from a control unit (not shown). The transmission RF signal Tx-RF has a frequency corresponding to the voltage of the control signal. Oscillates. The transmission RF signal generated here is transmitted to the selection unit 101 described above.
Is input to Note that the selecting means 101 is configured by a semiconductor switch, and the broken line portion in FIG. 7 is integrated on one IC.

Next, the transmission / reception operation of the radio circuit of the mobile radio terminal device having the above-described configuration according to the TDD system will be described.
First, the operation at the time of GSM transmission will be described. GSM
When transmitting, the switching voltage controlled oscillator 116
GS in response to a switching signal from a control unit (not shown)
M transmission RF signal Tx-A is generated as a transmission RF signal Tx-RF, and the selection unit 101 generates the transmission RF signal Tx-RF.
-A is selected and output to the transmitting / receiving downconverter 102.

The transmission / reception down converter 102 converts the transmission RF signal Tx-A (880 to 915 [MHz]) into R
F local signal RF-Lo (1126 to 1161 [MH
z]) and the IF band signal (246 [MH]
z]), and outputs the result to the IF filter 103.

In the branching means 104, the IF filter 103
Signal in the IF band (246 [MH]
z]) is branched and output to the gain control amplifier 121 and input to the phase comparator 113 as a transmission loop signal. At the time of this transmission, the gain control amplifier 121 is in an operation stop state.

In quadrature modulator 111, baseband transmission signal Tx-BB (Tx-I, Tx-Q) is converted into IF band (246) by IF local signal (IF-Lo).
[MHz]) and the transmission IF for phase comparison
The signal is output to the phase comparator 113.

The phase comparator 113 compares the phase of the transmission loop signal (246 [MHz]) from the branching means 104 with the phase of the transmission IF signal (246 [MHz]) for phase comparison. It is detected as a phase detection signal.

The charge pump 114 charges the current of the phase detection signal, performs charging and discharging, and generates a control signal for the switching voltage control oscillator 116. This control signal is smoothed by the low-pass filter 115,
It is input to the switching voltage controlled oscillator 116.

In the switching voltage controlled oscillator 116,
According to the voltage of the control signal smoothed by the low-pass filter 115, the transmission RF signal T of 880 to 915 [MHz]
xA is generated.

Next, the operation of the DCS 1800 at the time of transmission will be described. During transmission of DCS 1800, switching voltage controlled oscillator 116 responds to a switching signal from a control unit (not shown) to transmit GSM transmission RF signal Tx−
A is generated as a transmission RF signal Tx-RF,
01 selects the transmission RF signal Tx-A and outputs it to the transmission / reception down converter 102.

The transmission / reception down converter 102 transmits the transmission RF signal Tx-B (1710 to 1785 [MHz]).
To the RF local signal RF-Lo (1956-2031).
[MHz]) and the IF band signal (246).
[MHz]) and the IF filter 10
Output to 3.

In the branching means 104, the IF filter 103
Signal in the IF band (246 [MH]
z]) is branched and output to the gain control amplifier 121 and input to the phase comparator 113 as a transmission loop signal. At the time of this transmission, the gain control amplifier 121 is in an operation stop state.

In the quadrature modulator 111, the baseband transmission signal Tx-BB (Tx-I, Tx-Q) is converted into an IF band (246) by an IF local signal (IF-Lo).
[MHz]) and the transmission IF for phase comparison
The signal is output to the phase comparator 113.

The phase comparator 113 compares the phase of the transmission loop signal (246 [MHz]) from the branching unit 104 with the phase of the transmission IF signal (246 [MHz]) for phase comparison. It is detected as a phase detection signal.

The charge pump 114 charges the current of the phase detection signal, performs charging and discharging, and generates a control signal for the switching voltage control oscillator 116. This control signal is smoothed by the low-pass filter 115,
It is input to the switching voltage controlled oscillator 116.

In switching voltage controlled oscillator 116,
The transmission RF signal Tx-B of 1710 to 1785 [MHz] is generated according to the voltage of the control signal smoothed by the low-pass filter 115.

Next, the operation at the time of GSM reception will be described. At the time of receiving GSM, the selecting means 101 selects GS
The M received RF signals Rx-A are selected and output to the transmitting / receiving downconverter 102.

The transmission / reception downconverter 102 converts the received RF signal Rx-A (925 to 960 [MHz]) into R
F local signal RF-Lo (1171-1206 [MH
z]) and the IF band signal (246 [MH]
z]), and outputs the result to the IF filter 103.

In the branching means 104, the IF filter 103
Signal in the IF band (246 [MH]
z]) is branched and input to the gain control amplifier 121 and the phase comparator 113. At the time of this reception, the transmission system is in an operation stop state.

The gain control amplifier 121 controls the gain to control the level of the IF band signal input from the branching means 104, and inputs the signal to the quadrature demodulator 122. In the quadrature demodulator 122, an IF band signal (246 [MHz]) whose level is controlled by the gain control amplifier 121.
Is the IF local signal IF-Lo (246 [MHz])
And the baseband received signal Rx−
Quadrature demodulation is performed on BB (Rx-I, Rx-Q).

Next, the operation of the DCS 1800 at the time of reception will be described. When receiving the DCS 1800, the selecting unit 101 selects the received RF signal Rx-B of the DCS 1800 and outputs it to the transmission / reception down converter 102.

The transmission / reception down converter 102 receives the RF signal Rx-B (1805-1880 [MHz]).
Is converted to an RF local signal RF-Lo (2051-2126).
[MHz]) and the IF band signal (246).
[MHz]) and the IF filter 10
Output to 3.

In the branching means 104, the IF filter 103
Signal in the IF band (246 [MH]
z]) is branched and input to the gain control amplifier 121 and the phase comparator 113. At the time of this reception, the transmission system is in an operation stop state.

The gain control amplifier 121 controls the gain to control the level of the IF band signal input from the branching means 104, and inputs the signal to the quadrature demodulator 122. In the quadrature demodulator 122, an IF band signal (246 [MHz]) whose level is controlled by the gain control amplifier 121.
Is the IF local signal IF-Lo (246 [MHz])
And the baseband received signal Rx−
Quadrature demodulation is performed on BB (Rx-I, Rx-Q).

As described above, in the wireless circuit having the above configuration,
At the transmission timing, the down converter 102 is used to down-convert the transmission RF signal to generate a transmission loop signal, while at the reception timing, it is used to down-convert the reception RF signal to the reception IF signal. I have.

Therefore, according to the radio circuit having the above configuration, the generation of the transmission loop signal and the down-conversion of the received RF signal can be performed by one down converter 102, so that the radio circuit can be simplified and reduced. Thus, manufacturing costs can be reduced.

In the wireless circuit having the above configuration, one I
Since the F filter 103 suppresses unnecessary waves of the transmission loop signal and the reception IF signal, it is possible to further simplify and reduce the size of the radio circuit and reduce the manufacturing cost.

Further, in the radio circuit having the above-described configuration, the transmission RF signal of both GSM and DCS1800 is generated by one voltage-controlled oscillator 116. Therefore, the radio circuit is further simplified and reduced in size. The manufacturing cost can be reduced, and the number of ports indicated by broken lines integrated in one IC can be reduced.

Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, quadrature modulator 111 transmits baseband transmission signal Tx−
The IF local signal is used to generate a transmission IF signal for phase comparison using BB, and the phase comparator 113
The transmission loop signal from the branching means 104 is used for phase comparison with the transmission IF signal for phase comparison.

In contrast, for example, as shown in FIG.
The quadrature modulator 111 uses the transmission loop signal from the branching unit 104 to generate a transmission IF signal for phase comparison using the baseband transmission signal Tx-BB, and the phase comparator 113 A similar effect can be obtained by using an IF local signal for phase comparison with a transmission IF signal for transmission.

Next, a radio section of a mobile radio terminal according to a fourth embodiment of the present invention will be described.
This shows the configuration. In the following description, as in the first embodiment, a dual mode device corresponding to both the GSM and DCS1800 systems will be described as an example.

The radio section includes a selection means 101, a transmission / reception down converter 102, and an IF filter 103-3.
, A gain control amplifier 121, and a quadrature demodulator (Q-DE
M) 122, a quadrature modulator (Q-MOD) 111, a phase comparator (PD) 113, and a charge pump (CP) 1
14, a low-pass filter 115, and voltage control oscillators 116a and 116b for the transmission loop.

The received RF signals R of the two communication bands A and B
xA, Rx-B, and a transmission RF signal Tx generated by transmission loop voltage controlled oscillators 116a, 116b described later.
−A, Tx−B are input to the selection means 101.

Communication band A is a communication band corresponding to GSM, and transmission RF signal Tx-A is 880-915.
[MHz], the received RF signal Rx-A is 925-960.
[MHz].

On the other hand, the communication band B is a communication band corresponding to DCS1800, and the transmission RF signal Tx-B is
At 1785 [MHz], the received RF signal Rx-B is 180
It is 5 to 1880 [MHz]. Also, the intermediate frequency is
Both systems transmit and receive signals at 246 [MHz] inside the circuit.

The selection means 101 is a base station (not shown)
In order to perform communication by the TDD method between the receiving RF signal Rx-A and the receiving RF signal Rx-B, the transmitting RF signal Tx-A,
One of the signals Tx-B is selected and output to down-converter 102 for both transmission and reception.

The transmitting / receiving downconverter 102 converts the RF signal selected by the selecting means 101 into an RF local signal (RF-to-RF) generated by a local oscillation circuit (not shown).
Using Lo), the signal is down-converted into an IF band signal.

The IF band signal obtained by down-conversion of transmission / reception down-converter 102 is output to IF filter 103-3. IF filter 103-3
Suppresses unnecessary waves of the IF band signal, and outputs one of the differential outputs to the gain control amplifier 121,
The other is output to phase comparator 113.

The gain control amplifier 121 controls the gain to control the level of the input IF band signal. Here, the level-controlled IF band signal is input to a quadrature demodulator (Q-DEM) 122.

The quadrature demodulator 122 includes the gain control amplifier 12
1 is converted into an IF local signal (IF-L) generated by a local oscillation circuit (not shown).
o), the baseband received signal Rx-BB
(Rx-I, Rx-Q) to perform quadrature demodulation.

The quadrature modulator 111 outputs an IF local signal (IF-Lo) generated by a local oscillation circuit (not shown).
To the baseband transmission signal Tx-BB (Tx-I,
Tx-Q) and transmit I for phase comparison
Generate an F signal.

Transmission IF generated by quadrature modulator 111
The signal is converted by the phase comparator 113 into the above-described IF filter 1.
The phase is compared with that of the IF band signal output from 03-3. The result of this phase comparison is input to the charge pump 114 as a phase detection signal.

The charge pump 114 is connected to the phase comparator 11
The current of the phase detection signal of No. 3 is charged to generate a control signal for the transmission loop voltage controlled oscillators 116a and 116b described later. This control signal is smoothed by a low-pass filter 115, and then transmitted through a voltage control oscillator 116 for a transmission loop.
a and 116b are input as control signals.

Transmission loop voltage controlled oscillator 116a, 1
16b is a transmission R of a frequency corresponding to the voltage of the control signal.
Oscillates F signals Tx-A and Tx-B. These transmissions R
The F signal is input to the above-described selection means 101. In addition,
The selecting means 101 is constituted by a semiconductor switch,
The broken line in the figure is to be integrated on one IC.

Next, a description will be given of the transmission / reception operation of the radio circuit of the mobile radio terminal having the above-described configuration by the TDD system.
First, the operation at the time of GSM transmission will be described. GSM
When transmitting, the selecting means 101 selects the GSM transmission RF
The signal Tx-A is selected and the transmission / reception downconverter 1 is selected.
02 is output.

The transmission / reception downconverter 102 converts the transmission RF signal Tx-A (880 to 915 [MHz]) into R
F local signal RF-Lo (1126 to 1161 [MH
z]) and the IF band signal (246 [MH]
z]) and down-convert the IF filter 103−
Output to 3.

Differential output in which unnecessary waves are suppressed by IF filter 103-3 (IF band signal (246 [MHz]))
Is output to the gain control amplifier 121, and the other of the differential outputs is output to the phase comparator 113 as a transmission loop signal. At the time of this transmission, the gain control amplifier 121 is in an operation stop state.

In quadrature modulator 111, baseband transmission signal Tx-BB (Tx-I, Tx-Q) is converted to IF band (246) by IF local signal (IF-Lo).
[MHz]) and the transmission IF for phase comparison
The signal is output to the phase comparator 113.

In the phase comparator 113, the IF filter 10
A transmission loop signal (246 [MHz]) from 3-3,
The phase is compared with the transmission IF signal (246 [MHz]) for phase comparison, and the lead / lag of the phase is detected as a phase detection signal.

The charge pump 114 charges and discharges the current of the phase detection signal to generate a control signal for the transmission loop voltage control oscillator 116a. This control signal is smoothed by the low-pass filter 115 and then input to the transmission loop voltage controlled oscillator 116a.

In the transmission loop voltage controlled oscillator 116a, a transmission RF signal Tx-A of 880 to 915 [MHz] is generated according to the voltage of the control signal smoothed by the low-pass filter 115.

Next, the operation of DCS 1800 at the time of transmission will be described. When transmitting the DCS 1800, the selecting unit 101 selects the transmission RF signal Tx-B of the DCS 1800 and outputs it to the transmission / reception down converter 102.

The transmission / reception downconverter 102 transmits the transmission RF signal Tx-B (1710 to 1785 [MHz]).
To the RF local signal RF-Lo (1956-2031).
[MHz]) and the IF band signal (246).
[MHz]) and the IF filter 10
Output to 3-3.

Differential output in which unnecessary waves are suppressed by IF filter 103-3 (IF band signal (246 [MHz]))
Is output to the gain control amplifier 121, and the other of the differential outputs is output to the phase comparator 113 as a transmission loop signal. At the time of this transmission, the gain control amplifier 121 is in an operation stop state.

In quadrature modulator 111, baseband transmission signal Tx-BB (Tx-I, Tx-Q) is converted to IF band (246) by IF local signal (IF-Lo).
[MHz]) and the transmission IF for phase comparison
The signal is output to the phase comparator 113.

In the phase comparator 113, the IF filter 10
A transmission loop signal (246 [MHz]) from 3-3,
The phase is compared with the transmission IF signal (246 [MHz]) for phase comparison, and the lead / lag of the phase is detected as a phase detection signal.

The charge pump 114 charges the current of the phase detection signal, performs charging and discharging, and generates a control signal for the transmission loop voltage control oscillator 116b. The control signal is smoothed by the low-pass filter 115 and then input to the transmission loop voltage control oscillator 116b.

In the transmission loop voltage controlled oscillator 116b, the transmission R of 1710 to 1785 [MHz] is determined according to the voltage of the control signal smoothed by the low-pass filter 115.
An F signal Tx-B is generated.

Next, the operation at the time of GSM reception will be described. At the time of receiving GSM, the selecting means 101 selects GS
The M received RF signals Rx-A are selected and output to the transmitting / receiving downconverter 102.

The transmitting / receiving downconverter 102 converts the received RF signal Rx-A (925 to 960 [MHz]) into R
F local signal RF-Lo (1171-1206 [MH
z]) and the IF band signal (246 [MH]
z]) and the IF filter 103-3
Output to

Differential output in which unnecessary waves are suppressed by IF filter 103-3 (IF band signal (246 [MHz]))
Is output to the gain control amplifier 121, and the other of the differential outputs is input to the phase comparator 113 as a transmission loop signal. At the time of this reception, the transmission system is in an operation stop state.

The gain control amplifier 121 controls the gain, controls the level of the signal in the IF band input from the IF filter 103-3, and inputs the signal to the quadrature demodulator 122.

In the quadrature demodulator 122, the gain control amplifier 1
21 (246 [MH]
z]) is the IF local signal IF-Lo (246 [MH]
z]) and orthogonally demodulated into baseband received signals Rx-BB (Rx-I, Rx-Q).

Next, the operation of the DCS 1800 at the time of reception will be described. When receiving the DCS 1800, the selecting unit 101 selects the received RF signal Rx-B of the DCS 1800 and outputs it to the transmission / reception down converter 102.

The transmission / reception down converter 102 receives the RF signal Rx-B (1805-1880 [MHz]).
Is converted to an RF local signal RF-Lo (2051-2126).
[MHz]) and the IF band signal (246).
[MHz]) and the IF filter 10
Output to 3-3.

Differential output in which unnecessary waves are suppressed by IF filter 103-3 (IF band signal (246 [MHz]))
Is output to the gain control amplifier 121, and the other of the differential outputs is input to the phase comparator 113 as a transmission loop signal. At the time of this reception, the transmission system is in an operation stop state.

The gain control amplifier 121 controls the gain, controls the level of the IF band signal input from the IF filter 103-3, and inputs the signal to the quadrature demodulator 122.

In the quadrature demodulator 122, the gain control amplifier 1
21 (246 [MH]
z]) is the IF local signal IF-Lo (246 [MH]
z]) and orthogonally demodulated into baseband received signals Rx-BB (Rx-I, Rx-Q).

As described above, in the wireless circuit having the above configuration,
At the transmission timing, the down converter 102 is used to down-convert the transmission RF signal to generate a transmission loop signal, while at the reception timing, it is used to down-convert the reception RF signal to the reception IF signal. I have.

Therefore, according to the radio circuit having the above configuration, the generation of the transmission loop signal and the down-conversion of the reception RF signal can be performed by one down converter 102, so that the radio circuit can be simplified and reduced. Thus, manufacturing costs can be reduced.

In the radio circuit having the above configuration, one of the differential outputs among the results filtered by the IF filter 103-3 is processed as a reception IF signal, and the other differential output is used as a transmission loop signal. As a result, unnecessary waves of the transmission loop signal and the reception IF signal can be suppressed by one IF filter 103-3, and the branching means 104 used in the second and third embodiments described above becomes unnecessary. . For this reason, the wireless circuit is further simplified and reduced,
Manufacturing costs can be reduced.

Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, quadrature modulator 111 transmits baseband transmission signal Tx−
The IF local signal is used to generate a transmission IF signal for phase comparison using BB, and the phase comparator 113
The transmission loop signal from the branching means 104 is used for phase comparison with the transmission IF signal for phase comparison.

On the other hand, as shown in FIG. 10, for example, in the quadrature modulator 111, the IF filter 103- is used to generate the transmission IF signal for phase comparison using the transmission signal Tx-BB in the baseband. The same effect can be obtained even if the IF local signal is used in the phase comparator 113 to compare the phase with the above-described transmission IF signal for phase comparison using the transmission loop signal from No. 3.

The present invention is not limited to the above embodiment. For example, in the second embodiment, a configuration in which an unnecessary filter included in an IF signal for transmission is suppressed by providing an IF filter 112 between the quadrature modulator 111 and the phase comparator 113 (see FIG. 5) However, this configuration is not limited to the second embodiment, and FIGS. 1, 2, 7,
It goes without saying that the same effect can be obtained even if the present invention is implemented with the configurations shown in FIGS. 8, 9, and 10. It goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0228]

As described above, according to the present invention, TD
The RF signal of the communication band to be used is selectively input to the frequency conversion means from the selection means in accordance with the communication operation of the D system, and the frequency conversion means down-converts the received RF signal to an IF signal and transmits the signal. An IF signal for a transmission loop is generated based on the RF signal, and an unnecessary wave of the IF signal is suppressed by one filter.

In the mobile radio terminal device according to the present invention, means for generating an RF signal (switching oscillation means)
Is provided, and RF signals of two communication bands are generated.

Therefore, according to the present invention, the down conversion of the received RF signal into the IF signal and the transmission loop I / O based on the transmitted RF signal are performed by one frequency conversion means.
Since the F signal can be generated and the unnecessary waves of the two IF signals are suppressed by one filter, the mobile radio terminal device has only one means for generating the RF signal. It is possible to provide a mobile radio terminal device and a radio circuit capable of reducing the size of the circuit and reducing the cost.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of a first embodiment of a wireless circuit of a mobile wireless terminal device according to the present invention.

FIG. 2 is a circuit block diagram showing a modification of the wireless circuit shown in FIG.

FIG. 3 is a circuit block diagram showing a configuration of a second embodiment of the wireless circuit of the mobile wireless terminal device according to the present invention.

FIG. 4 is a circuit block diagram showing a modification of the wireless circuit shown in FIG. 3;

FIG. 5 is a circuit block diagram showing a modification of the wireless circuit shown in FIG. 3;

FIG. 6 is a circuit block diagram showing a modification of the wireless circuit shown in FIG. 3;

FIG. 7 is a circuit block diagram showing a configuration of a third embodiment of the wireless circuit of the mobile wireless terminal device according to the present invention.

FIG. 8 is a circuit block diagram showing a modification of the wireless circuit shown in FIG. 7;

FIG. 9 is a circuit block diagram showing a configuration of a fourth embodiment of the wireless circuit of the mobile wireless terminal device according to the present invention.

FIG. 10 is a circuit block diagram showing a modification of the wireless circuit shown in FIG. 9;

FIG. 11 is a circuit block diagram showing a configuration of a wireless circuit of a conventional mobile wireless terminal device.

[Explanation of symbols]

101 ... Selection means 102 ... Transmission / reception down converter 103, 103-1, 103-2, 103-3 ... IF filters 104, 105, 106 ... Branching means 111 ... Quadrature modulator (Q-MOD) 112 ... IF filter 113 ... Phase comparator (PD) 114 Charge pump (CP) 115 Low-pass filter 116 Switching voltage-controlled oscillator (Sw-VCO) 116a, 116b Voltage-controlled oscillator for transmission loop 121 Gain-controlled amplifier 122 Quadrature demodulator (Q -DEM)

Claims (22)

[Claims] The present invention is used in a dual-band communication system for performing communication by selectively using first and second two communication bands.
A transmission radio signal and a reception RF signal of the two communication bands are respectively input to a mobile radio terminal device that performs radio communication by an ision duplex method, and any one of the four RF signals is converted to a TDD signal. Selecting means for selectively outputting in accordance with the communication operation; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal; and IF signal obtained by down-converting the frequency converting means A first branching unit that branches into two, and a first branching unit that has a pass characteristic according to the first communication band and suppresses an unnecessary wave from one of the IF signals branched by the first branching unit. A second filter having a pass characteristic according to the second communication band and suppressing an unnecessary wave from the other of the IF signals branched by the first branching unit; An IF signal that has passed through the first filter and the second filter, respectively, is input, one of them is selected, and a second branching unit branches to two, and the second branching unit branches. Demodulation means for performing a demodulation process on one of the obtained IF signals using a local IF signal; modulation means for performing a modulation process on the local IF signal using an information signal; Phase comparing means for comparing a phase between the obtained modulation result and the other of the IF signals branched by the second branching means; and a first comparing means based on the phase comparing result of the phase comparing means. A first oscillating unit that generates the transmission RF signal of a communication band, and inputs the transmission RF signal of the second communication band based on a phase comparison result of the phase comparison unit; Input to the selection means And a second oscillating means. 2. A dual band communication system for performing communication by selectively using first and second communication bands, and a TDD (Time Divide) between the base station and the system.
A transmission radio signal and a reception RF signal of the two communication bands are respectively input to a mobile radio terminal device that performs radio communication by an ision duplex method, and any one of the four RF signals is converted to a TDD signal. Selecting means for selectively outputting in accordance with the communication operation; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal; and IF signal obtained by down-converting the frequency converting means A first branching unit that branches into two, and a first branching unit that has a pass characteristic according to the first communication band and suppresses an unnecessary wave from one of the IF signals branched by the first branching unit. A second filter having a pass characteristic according to the second communication band and suppressing an unnecessary wave from the other of the IF signals branched by the first branching unit; An IF signal that has passed through the first filter and the second filter, respectively, is input, one of them is selected, and a second branching unit branches to two, and the second branching unit branches. Demodulation means for performing a demodulation process on one of the obtained IF signals using a local IF signal; modulation means for performing a modulation process on the local IF signal using an information signal; Phase comparing means for comparing the phase of the obtained modulation result with the other of the IF signals branched by the second branching means; a communication band according to the switching signal, and further according to the control signal. And a oscillating unit for generating the transmission RF signal of the selected frequency based on the phase comparison result of the phase comparing unit and inputting the generated signal to the selecting unit. 3. A dual band communication system for performing communication by selectively using first and second two communication bands, and using a TDD (Time Divider) with a base station of the system.
A transmission radio signal and a reception RF signal of the two communication bands are respectively input to a mobile radio terminal device that performs radio communication by an ision duplex method, and any one of the four RF signals is converted to a TDD signal. Selecting means for selectively outputting in accordance with the communication operation; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal; unnecessary from the IF signal obtained by down-converting the frequency converting means A filter for suppressing a wave, a branching unit for branching the IF signal passing through the filter into two, and one of the IF signals branched by the branching unit.
Demodulation means for performing demodulation processing using a local IF signal; modulation means for performing modulation processing on the local IF signal using an information signal; modulation results obtained by the modulation means; Phase comparison means for comparing the phase with the other of the IF signals branched in the step (a), and generating the transmission RF signal of the first communication band based on the phase comparison result of the phase comparison means, First oscillating means input to the means, and second oscillating means generating the transmission RF signal of a second communication band based on the phase comparison result of the phase comparing means and inputting the RF signal to the selecting means. A mobile wireless terminal device comprising: 4. A dual band communication system for performing communication by selectively using first and second two communication bands, and TDD (Time Divide) between the base station and the system.
a switching oscillating means for generating a transmission RF signal having a communication band according to a switching signal and a frequency according to a control signal, and a switching oscillating means. A selection means for receiving the generated transmission RF signal and the reception RF signal, and selectively outputting any one of the three RF signals in accordance with the TDD communication operation; Frequency conversion means for down-converting the output RF signal into an IF signal; a filter for suppressing unnecessary waves from the IF signal obtained by down-conversion of the frequency conversion means; and two IF signals passing through this filter. Branching means, and one of the IF signals branched by the branching means,
Demodulation means for performing demodulation processing using a local IF signal; modulation means for performing modulation processing on the local IF signal using an information signal; modulation results obtained by the modulation means; And a control signal generating means for generating the control signal based on the phase comparison result of the phase comparing means. Characteristic mobile wireless terminal device. 5. A dual band communication system for performing communication by selectively using first and second communication bands, and a TDD (Time Divider) between the base station and the system.
a switching oscillating means for generating a transmission RF signal having a communication band according to a switching signal and a frequency according to a control signal, and a switching oscillating means. A selection means for receiving the generated transmission RF signal and the reception RF signal, and selectively outputting any one of the three RF signals in accordance with the TDD communication operation; Frequency converting means for down-converting the output RF signal into an IF signal; first branching means for splitting the IF signal obtained by the down-conversion of the frequency converting means into two; A first filter having an appropriate pass characteristic and suppressing unnecessary waves from one of the IF signals branched by the first branching means; A second filter that has a pass characteristic according to the frequency band and suppresses an unnecessary wave from the other of the IF signals branched by the first branching unit; and passes the first filter and the second filter respectively. IF signal is input, one of the IF signals is selected and branched into two, and a local IF signal is supplied to one of the IF signals branched by the second branching means. Demodulation means for performing demodulation processing using the information signal; modulation means for performing modulation processing on the local IF signal using an information signal; modulation results obtained by the modulation means; And a control signal generating means for generating the control signal based on the phase comparison result of the phase comparing means. Characteristic mobile wireless end End device. 6. A dual band communication system for performing communication by selectively using first and second two communication bands, and TDD (Time Divide) between the base station and the system.
A transmission radio signal and a reception RF signal of the two communication bands are respectively input to a mobile radio terminal device that performs radio communication by an ision duplex method, and any one of the four RF signals is converted to a TDD signal. Selecting means for selectively outputting in accordance with the communication operation; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal; unnecessary from the IF signal obtained by down-converting the frequency converting means A filter that suppresses waves and differentially outputs two IF signals having phases opposite to each other, and a demodulation that performs demodulation processing on one of the differential outputs obtained by the filter using a local IF signal. Means for performing a modulation process on the local IF signal using an information signal, a modulation result obtained by the modulation means, A phase comparison unit that performs a phase comparison with the other of the differential outputs obtained by the filter; and generating the transmission RF signal of the first communication band based on a phase comparison result of the phase comparison unit; A first oscillating unit input to the selecting unit, and a second oscillating unit generating the transmission RF signal of a second communication band based on a phase comparison result of the phase comparing unit and inputting the transmission RF signal to the selecting unit A mobile wireless terminal device comprising: 7. A transmission filter for suppressing a transmission spurious from a modulation result obtained by the modulation unit, wherein the phase comparison unit is configured to determine between a modulation result passing through the transmission filter and an output of the filter. 7. The mobile radio terminal device according to claim 1, wherein the phase comparison is performed. 8. A dual band communication system for performing communication by selectively using first and second two communication bands, and a TDD (Time Divider) between the base station and the system.
A transmission radio signal and a reception RF signal of the two communication bands are respectively input to a mobile radio terminal device that performs radio communication by an ision duplex method, and any one of the four RF signals is converted to a TDD signal. Selecting means for selectively outputting in accordance with the communication operation; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal; and IF signal obtained by down-converting the frequency converting means A first branching unit that branches into two, and a first branching unit that has a pass characteristic according to the first communication band and suppresses an unnecessary wave from one of the IF signals branched by the first branching unit. A second filter having a pass characteristic according to the second communication band and suppressing an unnecessary wave from the other of the IF signals branched by the first branching unit; An IF signal that has passed through the first filter and the second filter, respectively, is input, one of them is selected, and a second branching unit branches to two, and the second branching unit branches. Demodulation means for performing demodulation processing on one of the divided IF signals using a local IF signal, and modulation processing using an information signal on the other of the IF signals branched by the second branching means Modulating means for performing the modulation, the modulation result obtained by the modulating means, and the local I
Phase comparing means for comparing a phase with the F signal; and a first RF signal for generating the transmission RF signal of the first communication band based on the phase comparison result of the phase comparing means and inputting the transmission RF signal to the selecting means. Oscillating means, and a second oscillating means for generating the transmission RF signal of a second communication band based on a phase comparison result of the phase comparing means and inputting the transmission RF signal to the selecting means. Mobile radio terminal. 9. A dual band communication system for performing communication by selectively using first and second communication bands, and a TDD (Time Divide) between the base station and the system.
A transmission radio signal and a reception RF signal of the two communication bands are respectively input to a mobile radio terminal device that performs radio communication by an ision duplex method, and any one of the four RF signals is converted to a TDD signal. Selecting means for selectively outputting in accordance with the communication operation; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal; and IF signal obtained by down-converting the frequency converting means A first branching unit that branches into two, and a first branching unit that has a pass characteristic according to the first communication band and suppresses an unnecessary wave from one of the IF signals branched by the first branching unit. A second filter having a pass characteristic according to the second communication band and suppressing an unnecessary wave from the other of the IF signals branched by the first branching unit; An IF signal that has passed through the first filter and the second filter, respectively, is input, one of them is selected, and a second branching unit branches to two, and the second branching unit branches. Demodulation means for performing demodulation processing on one of the divided IF signals using a local IF signal, and modulation processing using an information signal on the other of the IF signals branched by the second branching means Modulating means for performing the modulation, the modulation result obtained by the modulating means, and the local I
Phase comparing means for comparing the phase with the F signal; and a transmission RF signal of a communication band corresponding to a switching signal and having a frequency corresponding to a control signal, based on a phase comparison result of the phase comparing means. And a oscillating means for generating and inputting to the selecting means. 10. A dual band communication system that performs communication by selectively using first and second communication bands, and uses a TDD (Time D) with a base station of the system.
In a mobile wireless terminal device that performs wireless communication by an ivision Duplex method, a transmission RF signal and a reception RF signal of the two communication bands are respectively input, and one of these four RF signals is transmitted to a TDD system. Selecting means for selectively outputting in accordance with the communication operation; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal; unnecessary from the IF signal obtained by down-converting the frequency converting means A filter for suppressing a wave, a branching unit for branching the IF signal passing through the filter into two, and one of the IF signals branched by the branching unit.
Demodulation means for performing demodulation processing using a local IF signal; and for the other of the IF signals branched by the branch means,
A modulating means for performing a modulating process using an information signal; a modulating result obtained by the modulating means;
Phase comparing means for comparing a phase with the F signal; and a first RF signal for generating the transmission RF signal of the first communication band based on the phase comparison result of the phase comparing means and inputting the transmission RF signal to the selecting means. Oscillating means, and a second oscillating means for generating the transmission RF signal of a second communication band based on a phase comparison result of the phase comparing means and inputting the transmission RF signal to the selecting means. Mobile radio terminal. 11. A dual band communication system for performing communication by selectively using the first and second two communication bands, and TDD (Time D) between the system and a base station of the system.
In a mobile wireless terminal device performing wireless communication according to the ivision Duplex method, a switching oscillating means for generating a transmission RF signal of a communication band corresponding to a switching signal and having a frequency corresponding to a control signal, A selection means for receiving the generated transmission RF signal and the reception RF signal, and selectively outputting any one of the three RF signals in accordance with the TDD communication operation; Frequency conversion means for down-converting the output RF signal into an IF signal; a filter for suppressing unnecessary waves from the IF signal obtained by down-conversion of the frequency conversion means; and two IF signals passing through this filter. Branching means, and one of the IF signals branched by the branching means,
Demodulation means for performing demodulation processing using a local IF signal; and for the other of the IF signals branched by the branch means,
A modulating means for performing a modulating process using an information signal; a modulating result obtained by the modulating means;
A mobile radio terminal device comprising: phase comparison means for comparing a phase with an F signal; and control signal generation means for generating the control signal based on a phase comparison result of the phase comparison means. . 12. A dual band communication system for performing communication by selectively using first and second two communication bands, and a TDD (Time D) between the system and a base station of the system.
In a mobile wireless terminal device performing wireless communication according to the ivision Duplex method, a switching oscillating means for generating a transmission RF signal having a communication band according to a switching signal and a frequency according to a control signal, and output from the selecting means Frequency converting means for down-converting an RF signal into an IF signal, first branching means for splitting an IF signal obtained by down-conversion of the frequency converting means into two, and a first communication band corresponding to the first communication band. A first filter that has a pass characteristic and suppresses an unnecessary wave from one of the IF signals branched by the first branching unit; and a pass filter that has a pass characteristic according to the second communication band. A second filter for suppressing unnecessary waves from the other of the IF signals branched by the first branching means, and an IF signal which has passed through each of the first filter and the second filter. A second branching means for selecting one of the two and branching the signal into two, and demodulating the one of the IF signals branched by the second branching means using a local IF signal Demodulation means for performing modulation processing on the other of the IF signals branched by the second branching means using an information signal; and a modulation result obtained by the modulation means; The local I
A mobile radio terminal device comprising: phase comparison means for comparing a phase with an F signal; and control signal generation means for generating the control signal based on a phase comparison result of the phase comparison means. . 13. A dual band communication system for performing communication by selectively using first and second two communication bands, and TDD (Time D) between the base station and the system.
In a mobile wireless terminal device that performs wireless communication by an ivision Duplex method, a transmission RF signal and a reception RF signal of the two communication bands are respectively input, and one of these four RF signals is transmitted to a TDD system. Selecting means for selectively outputting in accordance with the communication operation; frequency converting means for down-converting the RF signal output from the selecting means to an IF signal; unnecessary from the IF signal obtained by down-converting the frequency converting means A filter that suppresses waves and differentially outputs two IF signals having phases opposite to each other, and a demodulation that performs demodulation processing on one of the differential outputs obtained by the filter using a local IF signal. Means for performing a modulation process on the other of the differential outputs obtained by the filter using an information signal; A modulation result, the local I
Phase comparing means for comparing a phase with the F signal; and a first RF signal for generating the transmission RF signal of the first communication band based on the phase comparison result of the phase comparing means and inputting the transmission RF signal to the selecting means. Oscillating means, and a second oscillating means for generating the transmission RF signal of a second communication band based on a phase comparison result of the phase comparing means and inputting the transmission RF signal to the selecting means. Mobile radio terminal. 14. A transmission filter for suppressing a transmission spurious from a modulation result obtained by said modulation means, wherein said phase comparison means intervenes between a modulation result passed through said transmission filter and said local IF signal. 14. The mobile radio terminal device according to claim 8, wherein the phase comparison is performed. 15. A wireless communication system for performing a TDD (Time Division Duplex) wireless communication with a base station of a dual band communication system that performs communication by selectively using first and second two communication bands. In the wireless circuit, a transmission RF signal and a reception RF signal of the two communication bands are input, respectively, and any one of the four RF signals is selectively output according to a TDD communication operation. Means; frequency conversion means for down-converting the RF signal output from the selection means to an IF signal; and an IF signal obtained by down-conversion of the frequency conversion means, which is divided into two parts and is provided outside the radio circuit. First branching means for outputting, and two IF signals output to the outside from the first branching means are input after unnecessary waves are suppressed. A second branching means for selecting one of the two and branching into two; a demodulating means for performing a demodulation process on one of the IF signals branched by the second branching means using a local IF signal; A modulating means for performing a modulation process on the local IF signal using an information signal; and a modulation result obtained by the modulating means and the other of the IF signals branched by the second branching means. And a control signal generating means for generating a control signal for generating an RF signal based on a phase comparison result of the phase comparing means. . 16. A wireless communication system for performing a TDD (Time Division Duplex) wireless communication with a base station of a dual band communication system that performs communication by selectively using the first and second two communication bands. In the wireless circuit, a transmission RF signal and a reception RF signal of the two communication bands are input, respectively, and any one of the four RF signals is selectively output according to a TDD communication operation. Means; frequency conversion means for down-converting the RF signal output from the selection means to an IF signal and outputting the RF signal to the outside of the radio circuit; and IF signal output from the frequency conversion means to the outside.
This IF signal is input after unnecessary waves are suppressed,
Branching means, and one of the IF signals branched by the branching means,
Demodulation means for performing demodulation processing using a local IF signal; modulation means for performing modulation processing on the local IF signal using an information signal; modulation results obtained by the modulation means; Phase comparison means for comparing the phase of the IF signal with the other of the divided IF signals, and control signal generation means for generating a control signal for generating an RF signal based on the phase comparison result of the phase comparison means And a wireless circuit comprising: 17. A wireless communication system for performing wireless communication by a TDD (Time Division Duplex) method with a base station of a dual band communication system that performs communication by selectively using first and second two communication bands. In a radio circuit, a transmission RF signal and two reception RF signals are input, and one of these three RF signals is transmitted to a TD
Selecting means for selectively outputting according to the D-system communication operation; frequency converting means for down-converting the RF signal output from the selecting means into an IF signal and outputting the IF signal outside the radio circuit; IF signal output from the means to the outside,
This IF signal is input after unnecessary waves are suppressed,
Branching means, and one of the IF signals branched by the branching means,
Demodulation means for performing demodulation processing using a local IF signal; modulation means for performing modulation processing on the local IF signal using an information signal; modulation results obtained by the modulation means; Phase comparison means for comparing the phase of the IF signal with the other of the divided IF signals, and control signal generation means for generating a control signal for generating an RF signal based on the phase comparison result of the phase comparison means And a wireless circuit comprising: 18. A wireless communication system for performing wireless communication by a TDD (Time Division Duplex) method with a base station of a dual band communication system that performs communication by selectively using first and second two communication bands. In the wireless circuit, a transmission RF signal and a reception RF signal of the two communication bands are input, respectively, and any one of the four RF signals is selectively output according to a TDD communication operation. Means; frequency conversion means for down-converting the RF signal output from the selection means to an IF signal and outputting the RF signal to the outside of the radio circuit; and IF signal output from the frequency conversion means to the outside.
After the unnecessary wave is suppressed, the signal is input as two differential outputs having phases opposite to each other, and demodulation means for performing demodulation processing on one of the differential outputs using a local IF signal; A modulating means for performing a modulation process on the IF signal using the information signal; a phase comparing means for performing a phase comparison between the modulation result obtained by the modulating means and the other of the differential outputs; A wireless circuit, comprising: a control signal generation unit that generates a control signal for generating an RF signal based on a phase comparison result of the phase comparison unit. 19. A wireless communication system for performing wireless communication by a TDD (Time Division Duplex) method with a base station of a dual band communication system for performing communication by selectively using first and second two communication bands. In the wireless circuit, a transmission RF signal and a reception RF signal of the two communication bands are input, respectively, and any one of the four RF signals is selectively output according to a TDD communication operation. Means; frequency conversion means for down-converting the RF signal output from the selection means to an IF signal; and an IF signal obtained by down-conversion of the frequency conversion means, which is divided into two parts and is provided outside the radio circuit. First branching means for outputting, and two IF signals output to the outside from the first branching means are input after unnecessary waves are suppressed. A second branching means for selecting one of the two and branching into two; a demodulating means for performing a demodulation process on one of the IF signals branched by the second branching means using a local IF signal; A modulating means for modulating the other of the IF signals branched by the second branching means using an information signal; a modulation result obtained by the modulating means;
Phase comparison means for comparing the phase with the F signal; and control signal generation means for generating a control signal for generating an RF signal based on the phase comparison result of the phase comparison means. Wireless circuit. 20. A wireless communication system for performing wireless communication by a TDD (Time Division Duplex) method with a base station of a dual band communication system which performs communication by selectively using first and second two communication bands. In the wireless circuit, a transmission RF signal and a reception RF signal of the two communication bands are input, respectively, and any one of the four RF signals is selectively output according to a TDD communication operation. Means; frequency conversion means for down-converting the RF signal output from the selection means to an IF signal and outputting the RF signal to the outside of the radio circuit; and IF signal output from the frequency conversion means to the outside.
This IF signal is input after unnecessary waves are suppressed,
Branching means, and one of the IF signals branched by the branching means,
Demodulation means for performing demodulation processing using a local IF signal; and for the other of the IF signals branched by the branch means,
A modulating means for performing a modulating process using an information signal; a modulating result obtained by the modulating means;
Phase comparison means for comparing the phase with the F signal; and control signal generation means for generating a control signal for generating an RF signal based on the phase comparison result of the phase comparison means. Wireless circuit. 21. Wireless communication by a TDD (Time Division Duplex) method with a base station of a dual band communication system that performs communication by selectively using first and second communication bands. In a radio circuit, a transmission RF signal and two reception RF signals are input, and one of these three RF signals is transmitted to a TD
Selecting means for selectively outputting according to the D-system communication operation; frequency converting means for down-converting the RF signal output from the selecting means into an IF signal and outputting the IF signal outside the radio circuit; IF signal output from the means to the outside,
This IF signal is input after unnecessary waves are suppressed,
Branching means, and one of the IF signals branched by the branching means,
Demodulation means for performing demodulation processing using a local IF signal; and for the other of the IF signals branched by the branch means,
A modulating means for performing a modulating process using an information signal; a modulating result obtained by the modulating means;
Phase comparison means for comparing the phase with the F signal; and control signal generation means for generating a control signal for generating an RF signal based on the phase comparison result of the phase comparison means. Wireless circuit. 22. A wireless communication system for performing wireless communication by a TDD (Time Division Duplex) method with a base station of a dual band communication system that performs communication by selectively using first and second two communication bands. In the wireless circuit, a transmission RF signal and a reception RF signal of the two communication bands are input, respectively, and any one of the four RF signals is selectively output according to a TDD communication operation. Means; frequency conversion means for down-converting the RF signal output from the selection means to an IF signal and outputting the RF signal to the outside of the radio circuit; and IF signal output from the frequency conversion means to the outside.
Demodulation means for demodulating, using a local IF signal, demodulation of one of the two differential outputs having a phase opposite to each other after the unnecessary wave is suppressed; Modulating means for performing a modulation process on the other of the differential outputs obtained by using the information signal; a modulation result obtained by the modulating means;
Phase comparison means for comparing the phase with the F signal; and control signal generation means for generating a control signal for generating an RF signal based on the phase comparison result of the phase comparison means. Wireless circuit.