JP2003298450A - Radio machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio machine with a new configuration capable of outputting a plurality of local oscillation frequency signals. <P>SOLUTION: A receiving part of the radio machine having a demodulation part mixer (2a) for performing conversion between a signal of a radio frequency band and a signal of an intermediate frequency band while using a local oscillation frequency signal is provided with a variable frequency divider circuit 5 for dividing a frequency of an inputted frequency signal with a switchable prescribed frequency dividing ratio and outputting the signal, a PLL oscillation circuit 6a for outputting the oprescribed frequency signal, and an oscillation part mixer 7a for multiplying the output of the variable frequency divider circuit 5 and the output of the PLL oscillation circuit 6a to output the local oscillation frequency signal to the demodulation part mixer (2a). <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio used in a plurality of frequency bands.

[0002]

2. Description of the Related Art With the recent spread of wireless communication systems,
Mobile communications, especially cellular telephone systems, are in use worldwide.

However, since a communication system adopted by an operator providing communication is different for each area or even within the same area, a single radio can support a plurality of communication systems. Is desirable. In fact, nowadays, radios compatible with a few communication systems such as dual-mode radios and triple-mode radios have been realized.

FIG. 4 shows a configuration of a receiving unit in a conventional radio apparatus compatible with a typical multiple communication system. This receiving unit includes an RF amplifier 1a, which is an amplifier, and a demodulation unit mixer 2a that multiplies two signals and performs frequency filtering.
And an IF amplifier 3a, which is an amplifier, are provided in N reception systems, and these reception systems output the reception signal to the demodulation circuit 4. These receiving systems respectively receive the radio signals of the communication systems # 1 to #N,
The received signal is frequency-converted in the demodulator mixer 2a and output to the demodulator circuit 4 as a received signal that the demodulator circuit 4 can handle.

The frequency conversion in the demodulator mixer 2a is
This is performed by multiplying the received signal by the output of the local frequency signal oscillation circuit prepared for each communication system to remove unnecessary frequency components. For example, the received signal in the communication system # 1 is mixed with the local oscillation frequency signal output from the local frequency oscillation circuit 12 for the communication system # 1 in the demodulation unit mixer 2a, and unnecessary frequency components are removed to remove the demodulation circuit. 4 is output. Similarly, the radio signal of the communication system # 2 is converted by the local frequency signal of the local frequency oscillation circuit 13 for the communication system # 2, converted by the radio frequency signal of the communication system #N, and then converted by the local frequency oscillation circuit 14 for the communication system #N. It is adapted to be received by the demodulation circuit 4.

[0006]

One of the problems in realizing a radio device corresponding to such a plurality of communication systems is a local frequency signal oscillation for matching a signal to be transmitted or received with a frequency of the communication system. The circuit configuration is included. In the current radio equipment, like the radio equipment shown in FIG. 4, this local frequency signal oscillation circuit is required for each communication system, so if it is attempted to correspond to a larger number of systems, the circuit scale becomes enlarged. There is a problem that it will end up.

As conventional techniques for solving this problem, Japanese Patent Laid-Open Nos. 8-223073 and 10-1 are available.
There are inventions described in JP-A-76676, JP-A-2000-134129, and JP-A-2001-44858. These inventions are intended to reduce the frequency oscillating circuit in two communication systems. The technique is to optimize the configuration of the wireless device by specializing the frequency arrangement for each target communication system. Is. However, from the viewpoint of further integration of a plurality of systems in the future, it is difficult or practically impossible to realize the effects of the invention when the number of compatible communication systems increases with these technologies.

The invention described in Japanese Patent Laid-Open No. 2001-186042 relates to integration of three communication system oscillation circuit systems, and appropriately corresponds to one frequency signal divided by a plurality of division ratios. This is a technique used directly as the local oscillation frequency signal of the system. In this invention,
The frequency adjustment for switching the communication band and the communication channel is performed before the frequency division.

In view of the above background, it is an object of the present invention to provide a wireless device having a novel structure for outputting a plurality of local oscillation frequency signals.

[0010]

According to a first aspect of the present invention for achieving the above object, a local oscillation frequency signal is used to convert between a radio frequency band signal and an intermediate frequency band signal. A radio device having frequency conversion means (2a), which is a circuit for performing either modulation of a radio signal or demodulation of a radio signal, wherein an input frequency signal is divided by a predetermined dividing ratio that can be switched. A variable frequency divider circuit (5) for frequency division and output, a variable oscillator circuit (6a) for outputting a predetermined frequency signal whose frequency is adjustable, and an output of the variable frequency divider circuit and an output of the variable oscillator circuit. Thus, the wireless device is provided with a multiplication circuit (7a) that outputs a local oscillation frequency signal.

Thus, the variable frequency dividing circuit divides and outputs the input frequency signal, and the multiplying circuit multiplies this output by the output of the variable oscillating circuit to output the local oscillation frequency signal. At this time, since the frequency dividing ratio of the variable frequency dividing circuit can be switched, the frequency can be switched, and since the variable oscillator circuit can adjust the frequency, the frequency can be adjusted, so that a plurality of local oscillation frequency signals are output. It becomes possible to provide a wireless device.

The invention described in claim 2 is the same as claim 1.
In the wireless device described in (1), the frequency band of a predetermined frequency signal output from the variable oscillation circuit (6a) can be switched.

The invention described in claim 3 is the same as claim 1
Alternatively, in the wireless device described in the paragraph 2, the frequency division performed by the variable frequency division circuit includes fractional frequency division.

The invention according to claim 4 is the same as claim 1.
In the radio device according to any one of 1 to 3, the variable frequency dividing circuit divides the input frequency signal by a predetermined plurality of frequency dividing ratios and outputs the frequency signals from a plurality of ports. 9) and a switch device (10, 11) for receiving outputs from the plurality of ports, selecting from the received ones, and outputting.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) FIG. 1 shows the configuration of a receiving section in a radio device according to a first embodiment of the present invention. This receiving unit includes an RF amplifier 1a and a demodulator mixer 2
a, IF amplifier 3a, demodulation circuit 4, variable frequency dividing circuit 5, P
It is composed of an LL oscillator circuit 6a, an oscillator mixer 7a, and a high-frequency oscillator circuit 8. In this radio, by controlling the operations of the PLL oscillation circuit 6a and the variable frequency dividing circuit 5 in the receiving section, it is possible to output a plurality of local oscillation frequency signals for receiving radio signals. Specifically, North American communication systems PCS, cellular systems, GP
A local oscillation frequency signal required for reception of a communication system such as S and PDC1.5 can be output.
Hereinafter, the configuration and operation of this receiver will be described in detail.

The RF amplifier 1a is an amplifier that amplifies a signal from an antenna (not shown) of the wireless device and outputs it to the demodulator mixer 2a.

The demodulator mixer 2a is a mixer circuit that multiplies the output from the RF amplifier 1a and the output from the oscillator mixer 7a, removes unnecessary frequency components, and outputs the result to the IF amplifier 3a. That is, the local oscillation frequency signal is used to convert between the radio frequency band signal and the intermediate frequency band signal.

IF amplifier 3a, two of which are connected in series
Is the demodulation circuit 4 by amplifying the output from the demodulator mixer 2a.
It is an amplifier that outputs to.

The demodulation circuit 4 is a circuit that demodulates the signal from the IF amplifier 3a into a baseband signal and outputs the demodulated signal to a control unit (not shown) of the radio device.

The high frequency oscillating circuit 8 is a high frequency oscillating circuit which outputs a frequency signal of a predetermined frequency. This predetermined frequency is at least higher than the frequency of the communication system that can be used by this radio. Further, it is desirable that the predetermined frequency is at least twice as high as the frequency of the communication system that can be used by the radio device. In this embodiment, this predetermined frequency is 3960 MHz.

The variable frequency dividing circuit 5 comprises the high frequency oscillating circuit 8
Is a frequency dividing circuit for dividing and outputting the output of. The variable frequency dividing circuit 5 is adapted to receive a communication system switching signal as a control signal from the outside, for example, a control unit of a radio device. Based on this control signal, the variable frequency dividing circuit 5 switches the ratio of dividing the output of the high frequency oscillation circuit 8, that is, the dividing ratio of. The frequency division may be an integer frequency division or a fractional frequency division.

The PLL oscillation circuit 6a is an offset variable oscillation circuit that outputs a frequency signal for fine frequency adjustment. The PLL oscillation circuit 6a is adapted to receive a channel switching / fine adjustment signal and an oscillation frequency band switching signal as control signals from the outside, for example, a control unit of a radio device. Based on these control signals, the PLL oscillation circuit 6a finely adjusts the frequency of the output frequency signal and switches the reception frequency band.

The oscillating section mixer 7a multiplies the output from the variable frequency dividing circuit 5 and the output from the PLL oscillating circuit 6a, further removes unnecessary frequency components, and outputs them to the demodulating section mixer 2a as a local oscillating frequency signal. This is a mixer circuit for outputting.

In order for the receiving unit of the radio having the above-mentioned configuration to receive the signal of the above-mentioned communication system, 2100.00 to 2159.95 MHz in the PCS and 6990.04 to 723.in the cellular system. 97 MH
z, 1400 MHz for GPS, and PDC1.
In No. 5, it is necessary to be able to output a local oscillation frequency signal of 1347 to 1371 MHz.

In order to realize this, when performing reception by the PCS, the variable frequency dividing circuit 5 receives the communication system switching signal, and based on this, operates with the frequency dividing ratio set to 1/2. The output from the variable frequency dividing circuit 5 divided by the dividing ratio of 1/2 becomes a signal of 1980 MHz. Further, the PLL oscillation circuit 6a receives the channel switching / fine adjustment signal and the oscillation frequency band switching signal, and 120.00 to
It outputs a frequency signal in the range of 179.95 MHz.

When performing reception by the cellular system, the variable frequency dividing circuit 5 receives the communication system switching signal,
Based on that, the frequency division ratio is set to 1/6. The output from the variable frequency dividing circuit 5 divided by the division ratio of 1/6 is 660.
It becomes a signal of MHz. Further, the PLL oscillation circuit 6a receives the channel switching / fine adjustment signal and the oscillation frequency band switching signal, and based on that, 39.04 to 63.97 MH.
Output a frequency signal in the range of z.

When receiving by GPS or PDC1.5, the variable frequency dividing circuit 5 receives the communication system switching signal, and operates based on this signal with the frequency dividing ratio set to 1/3. The output from the variable frequency dividing circuit 5 divided by the frequency dividing ratio of 1/3 is a 1320 MHz signal. Further, the PLL oscillation circuit 6a receives the channel switching / fine adjustment signal and the oscillation frequency band switching signal, and based on this, 80 MHz in GPS and 27 to 51 MH in PDC1.5.
Output a frequency signal in the range of z.

The frequency signals output from the variable frequency dividing circuit 5 and the PLL oscillation circuit 6a are oscillated by the mixer 7a.
By multiplying by and removing unnecessary frequency components,
It becomes a local oscillation frequency signal for receiving each system and is output to the demodulator mixer 2a.

As described above, the variable frequency dividing circuit 5 divides the input frequency signal and outputs it, and the oscillating section mixer 7a multiplies this output by the output of the PLL oscillating circuit 6a to remove unnecessary frequency components. And outputs a local oscillation frequency signal. At this time, since the frequency division ratio of the output of the variable frequency dividing circuit 5 can be switched and the frequency of the frequency signal of the PLL oscillation circuit 6a can be switched, a plurality of local oscillation frequency signals are output. It becomes possible to provide a wireless device.

The invention disclosed in Japanese Unexamined Patent Publication No. 2001-186042, which is a radio device according to the prior art, is designed to perform frequency adjustment for switching communication bands and communication channels in a stage before frequency division. While there are
The radio device according to the present embodiment has a novel configuration because frequency adjustment is performed after frequency division.

(Second Embodiment) FIG. 2 shows the configuration of a receiving section in a radio device according to a second embodiment of the present invention. In the present embodiment, the variable frequency dividing circuit 5 is replaced with a multi-port output frequency dividing circuit 9 and a switch circuit 10 in the receiving section of the wireless device of the first embodiment. Therefore, the configuration of this embodiment is the same as the configuration of the first embodiment except for the multiport output frequency dividing circuit 9 and the switch circuit 10. Therefore, in the present embodiment, only the multi-port output frequency dividing circuit 9 and the switch circuit 10 will be described, and the same parts as those of the other first embodiment are denoted by the same reference numerals as those in FIG. Attached in Figure 2,
Descriptions thereof will be omitted.

The multiport output frequency dividing circuit 9 receives a predetermined frequency frequency signal inputted from the high frequency oscillating circuit 8 and outputs this signal to a predetermined plurality of frequency dividing ratios, for example, 1/2, 1.
/ 3, 2/3, 1/6, ... N / M (N and M are natural numbers such that N <M), and a plurality of outputs for outputting frequency signals from a plurality of ports for each division ratio. It is a frequency divider.
The frequency division may be an integer frequency division or a fractional frequency division.

The switch circuit 10 is a circuit having a switch for individually receiving outputs from a plurality of ports of the multi-port output frequency dividing circuit 9 and selecting one of them to output it to the oscillating section mixer 7a. is there. The switch circuit 10 is adapted to receive a communication system switching signal as a control signal from the outside, for example, a control unit of a radio device. The switch circuit 10 switches the switch based on this control signal and selects a signal to be output to the oscillator mixer 7a from the received signals.

When the receiver having the multi-port output frequency dividing circuit 9 and the switch circuit 10 receives the PCS, cellular system, GPS and PDC1.5 systems, the switch circuit 10 switches the communication system. A signal is received, and based on the received signal, one of the outputs from the multi-port output frequency dividing circuit 9 is 1/2, 1/6, 1 /, respectively.
An output having a frequency division ratio of 3 or 1/3 is selected and output to the oscillator mixer 7a.

In this way, the multiport output frequency dividing circuit 9
Output a plurality of frequency signals input from the switch circuit 10, the switch circuit 10 outputs one of them to the oscillation unit mixer 7a, and the oscillation unit mixer 7a outputs this output and the output of the PLL oscillation circuit 6a. Multiplication is performed to remove unnecessary frequency components and a local oscillation frequency signal is output. At this time, the division ratio of the outputs from the multi-port output frequency dividing circuit 9 and the switch circuit 10 can be switched, and the PLL oscillation circuit 6a can be switched.
Since the frequency of the frequency signal can be switched, it is possible to provide a radio device that outputs a plurality of local oscillation frequency signals.

In the invention disclosed in Japanese Patent Laid-Open No. 2001-186042, which is a conventional radio device, frequency adjustment for switching the communication band and the communication channel is performed before the frequency division. While there are
The radio device according to the present embodiment has a novel configuration because frequency adjustment is performed after frequency division.

(Third Embodiment) FIG. 3 shows the configuration of a receiving section in a radio device according to a third embodiment of the present invention. This receiver allows the radio to simultaneously receive radio signals in the two systems. The receiving unit includes RF amplifiers 1a and 1b, demodulator mixers 2a and 2a.
b, IF amplifiers 3a and 3b, demodulation circuit 4, PLL oscillation circuits 6a and 6b, oscillation section mixers 7a and 7b, high frequency oscillation circuit 8, multiport output frequency dividing circuit 9, and switch matrix circuit 11.

The RF amplifiers 1a and 1b have the same structure and operation as the RF amplifier 1a described in the second embodiment. The demodulator mixers 2a and 2b have the same configuration and operation as the demodulator mixer 2a described in the second embodiment.
The IF amplifiers 3a and 3b have the same configuration and operation as the IF amplifier 3a described in the second embodiment. Also, P
The LL oscillation circuits 6a and 6b are the PLs described in the second embodiment.
It has the same configuration and operation as the L oscillator circuit 6a. The oscillator mixers 7a and 7b have the same configuration and operation as the oscillator mixer 7a described in the second embodiment. Further, the high frequency oscillation circuit 8 is the high frequency oscillation circuit 8 described in the second embodiment.
It has the same structure and operation. The multiport output frequency dividing circuit 9 has the same configuration and operation as the multiport output frequency dividing circuit 9 described in the second embodiment.

The demodulation circuit 4 is a circuit that demodulates the signals from the IF amplifiers 3a and 3b into baseband signals and outputs them to a control unit (not shown) of the radio device.

The switch matrix circuit 11 individually receives the outputs from the plurality of ports of the multi-port output frequency dividing circuit 9, selects two different or the same, and oscillates them respectively with the oscillation section mixer 7a. Part mixer 7b
It is a circuit having a switch for outputting to each of. The switch matrix circuit 11 is adapted to receive a communication system switching signal as a control signal from the outside, for example, a control unit of a radio device. Further, the switch matrix circuit 11 switches the switch based on this control signal, and selects a signal to be output to the oscillator mixer 7a and the oscillator mixer 7b from the received signals.

In the receiving section having such a configuration, there are two systems of signals finally output to the demodulation circuit 4. 1
One is a system including an RF amplifier 1a, a demodulation unit mixer 2a, an IF amplifier 3a, a PLL oscillation circuit 6a, and an oscillation unit mixer 7a. The other is an RF amplifier 1b, a demodulation unit mixer 2b, an IF amplifier 3b, a PLL oscillation. This is a system including a circuit 6b and an oscillator mixer 7b. Since the two outputs from the switch matrix circuit 11 are output to the oscillating unit mixer 7a and the oscillating unit mixer 7b, respectively, the frequency signals output from the oscillating unit mixer 7a and the oscillating unit mixer 7b are communicated in respective systems. It becomes a local oscillation frequency signal for receiving a radio signal in the system.

Thus, the multiport output frequency dividing circuit 9
Is frequency-divided and outputs a plurality of frequency signals, and the switch matrix circuit 11 outputs two of them to the two systems of the oscillation unit mixer 7a and the oscillation unit mixer 7b, respectively, and the oscillation unit mixers 7a and 7b. Outputs the local oscillation frequency signal by multiplying this output by the outputs of the PLL oscillation circuits 6a and 6b to remove unnecessary frequency components. At this time, the frequency division ratios of the outputs from the multiport output frequency dividing circuit 9 and the switch matrix circuit 11 can be switched, and the frequencies of the frequency signals of the PLL oscillation circuits 6a and 6b can be switched. Therefore, it is possible to provide a radio device that outputs a plurality of local oscillation frequency signals.

In the invention disclosed in Japanese Patent Laid-Open No. 2001-186042, which is a conventional radio device, frequency adjustment for switching the communication band and the communication channel is performed before the frequency division. While there are
The radio device according to the present embodiment has a novel configuration because frequency adjustment is performed after frequency division.

In the first to third embodiments of the present invention, the demodulator mixer 2a uses the local oscillation frequency signal to convert between the radio frequency band signal and the intermediate frequency band signal. Constitutes a means.

Further, in the first to third embodiments of the present invention, the PLL oscillation circuit 6a and the PLL oscillation circuit 6b each constitute a variable oscillation circuit which outputs a predetermined frequency signal whose frequency can be adjusted.

Further, in the second embodiment, the multi-port output frequency dividing circuit 9 and the switch circuit 10 constitute a variable frequency dividing circuit for dividing and outputting the inputted frequency signal at a predetermined frequency dividing ratio that can be switched. To do. Further, in the third embodiment, the multiport output frequency dividing circuit 9 and the switch matrix circuit 11 constitute a variable frequency dividing circuit.

In the first to third embodiments, the oscillator mixer 7a and the oscillator mixer 7b multiply the output of the variable frequency divider circuit and the output of the oscillator circuit, respectively.
A multiplication circuit that outputs a local oscillation frequency signal is configured.

In the second and third embodiments, the switch circuit 10 and the switch matrix circuit 11 are also provided.
Respectively correspond to the switch devices.

Further, in the first to third embodiments, the configuration and operation of the receiving circuit of the radio device are shown. However, the radio circuit of the present invention can be implemented not only by the receiving circuit but also by the transmitting circuit. The machine may be configured to transmit radio signals for multiple systems.

Further, in the first to third embodiments, the frequency signal output from the high frequency oscillation circuit 8 does not have to be fixed and may be variable.

In addition, in the first to third embodiments, the oscillator mixers 7a and 7b perform multiplication and removal of unnecessary frequency components independently, but this is a multiplier and a bandpass filter. It may be realized by the configuration.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a receiving unit in a wireless device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a receiving unit in a wireless device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a receiving unit in a wireless device according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a receiving unit in a conventional wireless device.

[Explanation of symbols]

1 ... RF amplifiers 1a, 2a, 2b ... Demodulator mixer, 3 ...
IF amplifier, 4 ... Demodulation circuit, 5 ... Variable frequency divider circuit, 6a,
6b ... PLL oscillation circuit, 7a, 7b ... Oscillation section mixer, 8
… High-frequency oscillator circuit, 9… Multi-port output divider circuit, 1
0 ... switch circuit, 11 ... switch matrix circuit.

Claims (4)

[Claims] 1. A radio having a frequency conversion means (2a) for converting between a signal in a radio frequency band and a signal in an intermediate frequency band by using a locally oscillated frequency signal. A variable frequency dividing circuit (5) for dividing and outputting with a switchable predetermined frequency dividing ratio, a variable oscillator circuit (6a) for outputting a predetermined frequency signal with adjustable frequency, and an output of the variable frequency dividing circuit A radio device comprising: a multiplication circuit (7a) for outputting the local oscillation frequency signal to the frequency conversion means by multiplying the output of the variable oscillation circuit with the output of the variable oscillation circuit. 2. The radio device according to claim 1, wherein a frequency band of a predetermined frequency signal output from the variable oscillation circuit (6a) is switchable. 3. The radio device according to claim 1, wherein the frequency division performed by the variable frequency division circuit includes fractional frequency division. 4. The multi-port output frequency dividing circuit (9), wherein the variable frequency dividing circuit divides the input frequency signal by a plurality of predetermined frequency dividing ratios and outputs the frequency signals from a plurality of ports, and the plurality of port dividing circuits. A switch device (10, 11) for receiving the output from the device and selecting and outputting the received output;
The radio device according to any one of claims 1 to 3, comprising: