JP2011182271A - Radio transmission circuit, radio communication device, and method of configuring radio transmission circuit used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication device that simplifies circuit configuration, reduces circuit area, and reduces costs. <P>SOLUTION: A radio transmission circuit includes: an RFIC (1) and a transmission portion (2). The RFIC (1) has 1-port RF output configuration for transmission output or 2-port RF output configuration for high-band output and low-band output. The transmission portion (2) includes: a wideband power amplifier (21) for a multi-communication system and multi-band transmission; a band switch (24) for outputting the output of the wideband power amplifier to a signal path corresponding to each of transmission bands; a first matching correction circuit (22) for matching between the input of the wideband power amplifier and the output of the RFIC in each transmission band; and a second matching correction circuit (23) for matching between the output of the wideband power amplifier and the input of the band switch in each transmission band. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radio transmission circuit, a radio communication device, and a configuration method of a radio transmission circuit used for them, and more particularly to a configuration method of a radio transmission circuit corresponding to a multi-communication system and multiband.

  In recent years, wireless communication systems have evolved from GSM (Global System for Mobile Communications) to LTE (Long Term Evolution), and there are demands for multi-communication systems and multibands for wireless communication devices.

  In order to deal with these problems, the wireless communication device is provided with a power amplifier for each transmission band in the transmission portion. By arranging the power supply circuit, wiring, matching circuit and peripheral control circuit for one power amplifier, the circuit configuration becomes complicated, the circuit area increases by increasing the communication method and the corresponding band, and the cost also increases. To do.

  FIG. 2 shows a transmission / reception circuit corresponding to a typical multi-communication system and multi-band. The transmission / reception circuit shown in FIG. 2 includes an RFIC (Radio Frequency Integrated Circuit) 6, a WCDMA (Wideband Code Division Multiple Access) transmission / reception circuit 7, a GSM transmission / reception circuit 8, an antenna switch 9, and an antenna 10. .

  The WCDMA transmission / reception circuit 7 includes power amplifiers 71 to 73 and duplexers 74 to 76, and operates in a plurality of bands. The GSM transceiver circuit 8 includes power amplifiers 81 and 82 and duplexers 83 to 85, and operates in a plurality of bands. The antenna switch 9 switches the signal path according to the transmission / reception band.

  Hereinafter, a transmission / reception operation in the transmission / reception circuit will be described. Here, the WCDMA transmission / reception circuit 7 uses Band # 1, Band # 6, and Band # 9 as an example, and the GSM transmission / reception circuit 8 includes EGSM (Extended GSM) 900 (an extension of GSM) and DCS1800 (Digital Communication System 1800). (Wireless communication system used for digital mobile phones) and PCS (Personal Communication Services) 1900 (digital mobile phone services used in the United States and Canada) are taken as examples.

  When the FDD (Frequency Division Duplex) WCDMA Band # 1 operates, the antenna switch 9 performs switching operation to the signal paths s1 to s4 by the control signal 601 from the RFIC 6.

  When the GDD EGSM 900 of the TDD (Time Division Duplex) method is operated, the antenna switch 9 is switched in the time division between the transmission operation and the reception operation.

  When the reception operation of EGSM900 is performed, the antenna switch 9 performs the switching operation to the signal paths s1 to s7 by the control signal 601 from the RFIC 6. When the transmission operation of EGSM900 is performed, the antenna switch 9 performs the switching operation to the signal paths s1 to s5 by the control signal 601 from the RFIC 6. The transmission / reception operation of the EGSM 900 is repeated in a time division manner.

  The WCDMA transmission / reception circuit 7 uses a power amplifier 71, a power amplifier 72, and a power amplifier 73 corresponding to each band when transmitting Band # 1, Band # 9, and Band # 6. In the FDD WCDMA, since the transmission operation and the reception operation are simultaneous, the duplexer 74, the duplexer 75, and the duplexer are supplied to the Band # 1, Band # 9, and Band # 6 so that a high-level transmission signal is not input to the reception circuit. 76 is used.

  The GSM transmission / reception circuit 8 uses a power amplifier 81 and a power amplifier 82 corresponding to each band when EGSM900, DCS1800, and PCS1900 are transmitted.

  As an amplifier of a transmission / reception circuit corresponding to the above-described multi-communication system and multi-band, there is a technique as described in Patent Document 1 below. However, the technique as described in Patent Document 1 does not have the configuration shown in FIG. 2 and is not directly related to the present invention.

JP 2008-113202 A

  Currently, in wireless communication devices, RFICs provide RF (Radio Frequency) signal output ports for each transmission band, and a power amplifier corresponding to each transmission band frequency is provided to support multi-communication systems and multi-band communication. is set up.

  In the current transmission circuit configuration, increasing the transmission band increases the number of elements of the RF transmission circuit, complicates the circuit, and increases the circuit area. In addition, the circuit cost increases as the number of power amplifiers and peripheral elements increases. On the other hand, at the time of RF transmission, when only one band operates, the other power amplifiers are in a power-off state, so the circuit utilization efficiency is very low.

  Accordingly, an object of the present invention is to solve the above-described problems, and to provide a wireless transmission circuit, a wireless communication device, and a wireless transmission circuit used for them that can simplify the circuit configuration, reduce the circuit area, and reduce the cost. It is to provide a configuration method.

A wireless transmission circuit according to the present invention includes a 1-port RF (Radio Frequency) output or an RFIC (Radio Frequency Integrated Circuit) in which 2-port RF outputs of a high-band output and a low-band output are combined.
Wideband power amplifier for supporting multi-communication system and multiband transmission, band switch for outputting the output of the wideband power amplifier to a signal path corresponding to each transmission band, and input of the wideband power amplifier in each transmission band A first matching correction circuit for matching between the output of the RFIC and the output of the RFIC, and a second matching correction circuit for matching between the output of the broadband power amplifier and the input of the band switch in each transmission band Including a transmission part.

  A wireless communication device according to the present invention includes the above-described wireless transmission circuit.

A method of configuring a wireless transmission circuit according to the present invention is a multi-communication that combines transmission output of RFIC (Radio Frequency Integrated Circuit) into 1-port RF (Radio Frequency) output or 2-port RF output of high band output and low band output. Wide band power amplifier for supporting the system and multi-band transmission, and a band switch for outputting the output of the wide band power amplifier to a signal path corresponding to each transmission band is provided in the transmission part,
In each of the transmission bands, a first matching correction circuit that performs matching between the input of the broadband power amplifier and the output of the RFIC is connected to the input terminal of the broadband power amplifier,
In each transmission band, a second matching correction circuit for matching between the output of the broadband power amplifier and the input of the band switch is connected to the output terminal of the broadband power amplifier.

  By adopting the configuration and operation as described above, the present invention can achieve an effect that the circuit configuration can be simplified, the circuit area can be reduced, and the cost can be reduced.

It is a block diagram which shows the structural example of the radio | wireless communication apparatus by embodiment of this invention. It is a block diagram which shows the structural example of the radio | wireless communication apparatus relevant to this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. First, an outline of a wireless communication device according to the present invention will be described. The wireless communication device according to the present invention is characterized in that the circuit is reduced in size by a simplified wireless transmission circuit corresponding to a multi-communication system and a multi-band.

  The radio communication circuit combines RFIC (Radio Frequency Integrated Circuit) transmission outputs into a 1-port RF (Radio Frequency) output or a 2-port RF output of a high-band output and a low-band output, and a wideband power amplifier and an input and By providing an output matching correction circuit, the wireless communication circuit is simplified. Further, the wireless communication circuit reduces the number of elements of the power amplifier and the peripheral circuit, thereby simplifying the circuit configuration, reducing the circuit area, and reducing the cost.

  The configuration of the wireless communication circuit according to the present invention is mainly composed of three circuit parts, that is, an RFIC, a transmission part, and an antenna switch. The transmission part is composed of a broadband power amplifier, first and second matching correction circuits, a band switch, and a control signal decoder.

  In this circuit configuration, the configuration of the wireless communication circuit is simplified by using a wideband power amplifier, first and second matching correction circuits, and an RFIC having a 1-port RF output.

  The transmission part uses a wideband power amplifier to support multi-communication systems and multi-band transmission. In order to obtain matching between the wideband power amplifier and the RFIC in each transmission band, a first matching correction circuit is disposed at the input terminal of the wideband power amplifier. In each transmission band, a second matching correction circuit is disposed at the output end of the wideband power amplifier in order to obtain matching between the wideband power amplifier and the band switch.

  The first and second matching correction circuits are matching networks configured by serial and parallel connections of LCR [coil (L), capacitor (C), resistor (R)]. The optimum connection and the optimum constant are determined by design according to the multi-communication method and the multi-band correspondence, and in actual operation, they are switched and used by setting with the control signal from the RFIC.

  A control signal from the RFIC is decoded by a control signal decoder. The signal is used to control the correction operation of the first and second matching correction circuits. Further, the decoded signal can satisfy the standard by controlling the power supply voltage, bias voltage, ramp voltage and the like of the wideband power amplifier to optimize the transmission signal. The control signal from the RFIC is design data written in a nonvolatile memory or the like, pre-adjustment data, a real time control signal, and information such as an operation band and a communication method.

  The control signal transmitted according to the transmission band from the RFIC is decoded by the control signal decoder to control the band switch. Thereby, the signal output from the second matching correction circuit is output to the signal path corresponding to the transmission band.

  A WCDMA (Wideband Code Division Multiple Access) transmission signal is output to a duplexer by switching of a band switch.

  A GSM (Global System for Mobile communications) transmission signal is output to an antenna switch by switching of a band switch.

  The RFIC control signal controls the antenna switch according to the transmission band. Thereby, the transmission signal of each transmission band is output to the antenna.

  FIG. 1 is a block diagram showing a configuration example of a wireless communication device according to an embodiment of the present invention. In FIG. 1, a wireless communication device according to an embodiment of the present invention includes an RFIC 1, a transmission portion 2, an antenna switch 4, an antenna 5, and duplexers 31 to 36.

  The transmission portion 2 includes a wideband power amplifier 21, matching correction circuits 22 and 23, a band switch 24, and a control signal decoder 25. In this circuit configuration, the wireless circuit configuration is simplified by using the broadband power amplifier 21, the matching correction circuits 22 and 23, and the RFIC 1 having a 1-port RF output.

  In the present embodiment, in order to realize a simplified wireless communication circuit corresponding to a multi-communication system and multi-band, the transmission output of the RFIC 1 is a 1-port RF output or a 2-port RF output of a high band and a low band output. In summary, a broadband power amplifier 21, matching correction circuits 22 and 23, and a control signal decoder 25 are provided.

  In the transmission part 2, a broadband power amplifier 21 is used in order to cope with the multi-communication system and multi-band transmission. In addition, in the transmission portion 2, a matching correction circuit 22 is arranged at the input end of the wideband power amplifier 21 in order to obtain matching between the wideband power amplifier 21 and the RFIC 1 in each transmission band.

  Further, in the transmission part 2, a matching correction circuit 23 is arranged at the output terminal of the wideband power amplifier 21 in order to obtain matching between the wideband power amplifier 21 and the band switch 24 in each transmission band.

  The matching correction circuits 22 and 23 are matching networks configured by connecting LCRs in series and in parallel. In the matching correction circuits 22 and 23, the optimum connection and the optimum constant are determined by design according to the communication method and band correspondence, and in actual operation, the matching correction circuits 22 and 23 are switched and used by setting with the control signal 102 from the RFIC1.

  The control signal 102 from the RFIC 1 is decoded by the control signal decoder 25, and the correction operation of the matching correction circuits 22 and 23 is controlled using the signal. Further, the decoded signal can satisfy the standard by controlling the power supply voltage, bias voltage, ramp voltage and the like of the broadband power amplifier 21 to optimize the transmission signal.

  The control signal 102 from the RFIC 1 is design data written in a nonvolatile memory or the like, pre-adjustment data, a real time control signal, and information such as an operation band and a communication method.

  The control signal 102 transmitted according to the transmission band from the RFIC 1 is decoded by the control signal decoder 25 to control the band switch 24. Thereby, the signal output from the matching correction circuit 23 is output to a signal path corresponding to the transmission band.

  The WCDMA transmission signal is output to the duplexers 31 to 33 by switching of the band switch 24. The GSM transmission signal is output to the antenna switch 4 by switching of the band switch 24.

  The control signal 101 of the RFIC 1 controls the antenna switch 4 according to the transmission band. Thereby, the transmission signal of each transmission band is output from the antenna switch 4 to the antenna 5.

  Next, the wireless communication device according to the present embodiment will be described in more detail with reference to FIG.

  In the present embodiment, a matching correction circuit 22 is arranged at the input end of the broadband power amplifier 21 in order to obtain matching between the broadband power amplifier 21 and the RFIC 1 in each transmission band. The matching correction circuit 22 is connected to the input terminal of the broadband power amplifier 21 and matches the output of the RFIC 1 and the input of the broadband power amplifier 21.

  In the present embodiment, a matching correction circuit 23 is disposed at the output terminal of the broadband power amplifier 21 in order to obtain matching between the broadband power amplifier 21 and the band switch 24 in each transmission band. The matching correction circuit 23 is connected to the output terminal of the broadband power amplifier 21 and matches the output of the broadband power amplifier 21 and the input of the band switch 24.

  The transmission portion 2 includes a control signal decoder 25 that decodes the control signal 102 from the RFIC 1 and controls the broadband power amplifier 21 and the band switch 24, respectively.

  The WCDMA transmission signal is amplified by the broadband power amplifier 21, output to the duplexers 31 to 33 by switching of the band switch 24, and output to the antenna switch 4. The GSM transmission signal is amplified by the broadband power amplifier 21 and output to the antenna switch 4 by switching of the band switch 24.

  The control signal 102 of the RFIC 1 controls the band switch 24, the matching correction circuit 22 on the power amplifier input side, and the matching correction circuit 23 on the power amplifier output side. The control signal 101 of the RFIC 1 controls the antenna switch 4.

  Next, the operation of the wireless communication device according to the embodiment of the present invention will be described with reference to FIG.

  The RF signal output from the RFIC 1 is input to the broadband power amplifier 21 of the transmission part 2 and amplified. In the present embodiment, a matching correction circuit 22 is provided for matching between the input of the broadband power amplifier 21 and the output of the RFIC 1, and matching between the output of the broadband power amplifier 21 and the input of the band switch 24 is performed. In order to achieve this, a matching correction circuit 23 is provided. In the matching correction circuits 22 and 23, the parameters of each element are designed according to the operating frequency of each transmission band.

  The control signal 102 from the RFIC 1 is decoded by the control signal decoder 25. The matching correction circuits 22 and 23 can adjust the parameters of the matching element corresponding to the transmission band and the circuit format according to the decoded signals. The control signal 102 from the RFIC 1 is design data written in a nonvolatile memory or the like, pre-adjustment data, a real time control signal, and information such as an operation band and a communication method.

  Furthermore, the signal decoded by the control signal decoder 25 can control the power supply voltage, bias voltage, ramp voltage, etc. of the broadband power amplifier 21 to optimize the transmission signal and meet the standard.

  The output signal of the broadband power amplifier 21 is input to the band switch 24. The band switch 24 performs a switching operation according to communication method information and band information.

  The WCDMA transmission signal is amplified by the broadband power amplifier 21, output to the duplexers 31 to 33 by switching of the band switch 24, and output to the antenna switch 4. The GSM transmission signal is amplified by the broadband power amplifier 21 and output to the antenna switch 4 by switching of the band switch 24.

  The antenna switch 4 performs a switching operation of the signal paths s1 to s9 based on the communication method information and the band information, and outputs a transmission signal to the antenna 5.

  As described above, in this embodiment, the transmission output of the RFIC 1 is combined into a 1-port RF output or a 2-port RF output of a high band output and a low band output, and the transmission portion 2 is combined with the wideband power amplifier 21 and the matching correction circuit 22. , 23, the band switch 24, and the control signal decoder 25, a plurality of power amplifiers are reduced to the wideband power amplifier 21, thereby simplifying the circuit configuration, reducing the circuit area, and reducing the cost. Can be reduced.

1 RFIC
2 Sending part
4 Antenna switch
5 Antenna
21 Broadband power amplifier 22, 23 Matching correction circuit
24 band switch
25 Control signal decoder 31-36 Duplexer 101, 102 Control signal

Claims (9)

RFIC (Radio Frequency Integrated Circuit) in which transmission output is combined into 1-port RF (Radio Frequency) output or 2-port RF output of high band output and low band output;
Wideband power amplifier for supporting multi-communication system and multiband transmission, band switch for outputting the output of the wideband power amplifier to a signal path corresponding to each transmission band, and input of the wideband power amplifier in each transmission band A first matching correction circuit for matching between the output of the RFIC and the output of the RFIC, and a second matching correction circuit for matching between the output of the broadband power amplifier and the input of the band switch in each transmission band A wireless transmission circuit comprising: a transmission portion including:   The first and second matching correction circuits are matching networks configured by connecting a coil, a capacitor, and a resistor in series and in parallel, and an optimal connection and an optimal constant are provided by the multi-communication method and multi-band correspondence. The wireless transmission circuit according to claim 1, wherein: is determined by design.   3. The radio transmission circuit according to claim 1, wherein the correction operation of the first and second matching correction circuits is controlled by a control signal from the RFIC.   4. The transmission signal is optimized by controlling at least a power supply voltage, a bias voltage, and a ramp voltage of the broadband power amplifier with a control signal from the RFIC. Wireless transmission circuit.   A wireless communication device comprising the wireless transmission circuit according to any one of claims 1 to 4. RFIC (Radio Frequency Integrated Circuit) transmission output is combined into 1-port RF (Radio Frequency) output or 2-port RF output of high-band output and low-band output, and wideband to support multi-communication system and multi-band transmission A power amplifier and a band switch that outputs the output of the broadband power amplifier to a signal path corresponding to each transmission band are provided in the transmission part,
In each of the transmission bands, a first matching correction circuit that performs matching between the input of the broadband power amplifier and the output of the RFIC is connected to the input terminal of the broadband power amplifier,
A configuration of a radio transmission circuit, characterized in that a second matching correction circuit for matching between the output of the broadband power amplifier and the input of a band switch in each transmission band is connected to the output terminal of the broadband power amplifier. Method.   The first and second matching correction circuits are matching networks configured by connecting a coil, a capacitor, and a resistor in series and in parallel, and an optimal connection and an optimal constant are provided by the multi-communication method and multi-band correspondence. The method of configuring a wireless transmission circuit according to claim 6, wherein: is determined by design.   8. The method of configuring a wireless transmission circuit according to claim 6, wherein the correction operation of the first and second matching correction circuits is controlled by a control signal from the RFIC.   9. The transmission signal is optimized by controlling at least a power supply voltage, a bias voltage, and a ramp voltage of the broadband power amplifier with a control signal from the RFIC. Configuration method of the wireless transmission circuit.

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