JP2015126365A - Receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of obtaining level information on a desired wave and an interference wave simultaneously, and capable of obtaining proper gain setting suitable for a reception condition within a short period of time using a small scale circuit.SOLUTION: A receiver includes: a high frequency amplifier 21 for amplifying an inputted high frequency signal; a mixer 31 for converting an output signal of the high frequency amplifier 21; a first filter 71, having a first frequency characteristic, for accepting an output signal of the mixer 31; a first peak detector 81 for detecting a peak level of an output signal of the first filter 71; a second filter 72, having a second frequency characteristic different from the first frequency characteristic, for accepting the output signal of the mixer 31; a second peak detector 82 for detecting a peak level of an output signal of the second filter 72; and a control part 92 for controlling the gain of at least one of the high frequency amplifier 21 and the mixer 31, according to each output signal of the first and second peak detector 81 and 82.

Description

  The present invention relates to a high-frequency signal receiver.

  Today, a plurality of wireless systems are mixed in smartphones and severe interference conditions are assumed. Conventionally, in order to prevent the reception performance from deteriorating significantly, the proximity interference wave is suppressed by using an expensive component such as a SAW filter.

  According to a certain prior art, the signal that has passed through the filter and the signal that has not passed through are AD-converted, and the intensity of the interference wave is determined by digital calculation (see Patent Document 1).

  For example, a receiver compatible with IEEE 802.11ah, which is a wireless LAN specification for long-distance transmission using the 900 MHz band, is required to control the gain of the RF front-end circuit in a short time. Further, if the presence or absence of a nearby interfering wave can be detected at the same time, an operation such as a low distortion mode when the interfering wave is present and a low noise mode when it is absent can be performed.

JP 2008-10909 A

  According to the technique of Patent Document 1, since the signal level is determined by digital calculation after AD conversion, the determination is delayed.

  An object of the present invention is to provide a technique capable of obtaining level information of a desired wave and an interference wave at the same time, and making a gain setting suitable for a reception situation in a short time using a small circuit.

  To achieve the above object, a receiver according to the present invention has a high-frequency amplifier that amplifies an input high-frequency signal, a mixer that converts a frequency of an output signal of the high-frequency amplifier, and a first frequency characteristic. A first filter that receives an output signal of the mixer; a first peak detector that detects a peak level of the output signal of the first filter; and a second frequency characteristic different from the first frequency characteristic. A second filter that receives the output signal of the mixer, a second peak detector that detects a peak level of the output signal of the second filter, and each of the first and second peak detectors According to the output signal, the high-frequency amplifier and the control unit for controlling at least one gain of the mixer are provided.

  According to the present invention, level information of a desired wave and an interference wave can be obtained at the same time, and a gain setting suitable for a reception situation can be set in a short time using a small circuit.

It is a block diagram which shows the structure of the receiver which concerns on the 1st Embodiment of this invention. (A) is a frequency characteristic diagram showing the interference wave attenuation characteristic of the first bandpass filter in FIG. 1, and (b) is a frequency characteristic diagram showing the desired wave attenuation characteristic of the second bandpass filter in FIG. It is a circuit diagram which shows the detailed structural example of the 1st and 2nd peak detector in FIG. It is a circuit diagram which shows the other detailed structural example of the 1st and 2nd peak detector in FIG. It is a figure which shows the example of the table information which the control part in FIG. 1 uses. It is a block diagram which shows the structure of the receiver which concerns on the 2nd Embodiment of this invention. It is a figure which shows the example of the table information which the control part in FIG. 6 uses. It is a block diagram which shows the structure of the receiver which concerns on the 3rd Embodiment of this invention. It is a figure which shows the example of the table information which the control part in FIG. 8 uses. It is a block diagram which shows the structure of the receiver which concerns on the 4th Embodiment of this invention. It is a figure which shows the example of the table information which the control part in FIG. 10 uses. It is a block diagram which shows the structure of the receiver which concerns on the 5th Embodiment of this invention. It is a figure which shows the example of the table information which the control part in FIG. 12 uses.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<< First Embodiment >>
FIG. 1 shows the configuration of a receiver according to the first embodiment of the present invention. 1 includes an antenna (ANT) 11, a low noise amplifier (LNA) 21, a mixer (MIX) 31, an amplifier (AMP) 41, a low pass filter (LPF) 51, an AD converter (ADC). ) 61 and a demodulating circuit 91. The RF signal received by the antenna 11 is a low-noise amplifier 21 that is a high-frequency amplifier that amplifies the RF signal, a mixer 31 that converts the RF signal into an IF signal, an amplifier 41 that amplifies the IF signal, and a high-frequency signal. The signal is demodulated through a low-pass filter 51 that performs the conversion, an AD converter 61 that converts an analog signal into a digital signal, and a demodulation circuit 91.

  The receiver of FIG. 1 includes a first bandpass filter (first BPF) 71, a first peak detector (PDET1) 81, a second bandpass filter (second BPF) 72, and a second peak detection. A device (PDET2) 82, a control unit 92, and a table information storage unit 100 are further provided. The first band-pass filter 71 is a filter that has the first frequency characteristic and receives the output signal of the mixer 31. The first peak detector 81 is a circuit that detects the peak level of the output signal of the first bandpass filter 71. The second band pass filter 72 has a second frequency characteristic different from the first frequency characteristic of the first band pass filter 71 and receives the output signal of the mixer 31. The second peak detector 82 is a circuit that detects the peak level of the output signal of the second bandpass filter 72. The control unit 92 has a function of controlling at least one gain of the low noise amplifier 21 and the mixer 31 according to the output signals P1 and P2 of the first and second peak detectors 81 and 82, respectively. The signals P1 and P2 are binary or multilevel digital signals. The demodulation circuit 91 and the control unit 92 are realized by a DSP (digital signal processor) 90. The table information storage unit 100 is a memory that stores table information used by the control unit 92.

  2A shows the interference wave attenuation characteristic of the first band-pass filter 71 in FIG. 1, and FIG. 2B shows the desired wave attenuation characteristic of the second band-pass filter 72 in FIG. FIG. The first band pass filter 71 does not attenuate the desired wave, but attenuates the interference wave by 20 dB. The second bandpass filter 72 does not attenuate the interference wave, but attenuates the desired wave by 20 dB.

  FIG. 3 shows a detailed configuration example of the first and second peak detectors 81 and 82 in FIG. The peak detector shown in FIG. 3 includes a MOS transistor 121 that receives an input signal at the gate and detects the peak level, and a peak level holder 122 connected in series to the MOS transistor 121. The peak level holder 122 is realized by a resistor and a capacitor, for example.

  FIG. 4 shows another detailed configuration example of the first and second peak detectors 81 and 82 in FIG. The peak detector of FIG. 4 includes a first differential MOS transistor pair 131 and 132 that receive complementary I signals (+ I signal and −I signal) at their gates, and complementary Q signals (+ Q signal and −Q signal). ) At each gate, and a peak level holder connected in series to the first and second differential MOS transistor pairs 131, 132, 133, and 134. 122.

  According to the configuration of FIG. 4, since the MOS transistor of the peak detector is connected to any signal node of the + I signal, −I signal, + Q signal, and −Q signal, a load is applied to any signal node. Can be uniform. In addition, the rise of the peak detector output can be accelerated. However, only one of the I signal and the Q signal may be used. Further, not only the differential configuration but also a single end configuration may be used.

  FIG. 5 shows an example of table information used by the control unit 92 in FIG. The output signals P1 and P2 of the first and second peak detectors 81 and 82 are binary signals of “0” or “1”, respectively, and the threshold value is set to −10 dBm. That is, the signal P1 is set to “1” when the desired wave is −10 dBm or more or the disturbing wave is +10 dBm or more, and the signal P2 is set to “1” when the desired wave is +10 dBm or more or the disturbing wave is −10 dBm or more. The gain for the desired wave of the low noise amplifier 21 can be set to 30 dB, 20 dB, or 0 dB, and the gain for the desired wave of the mixer 31 can be set to 20 dB or 0 dB. The gain for the interference wave of the low noise amplifier 21 is assumed to be equal to the gain for the desired wave. The gain of the mixer 31 with respect to the disturbing wave is assumed to be 20 dB lower than that with respect to the desired wave.

  Based on the above premise, the gain settings of the low noise amplifier 21 and the mixer 31 are set to 20 dB, respectively, and the control unit 92 observes the output signals P1 and P2 of the first and second peak detectors 81 and 82, respectively. . And the control part 92 controls the gain of each step according to the table information of FIG. For example, if the interference wave is -30 dBm or less and the desired wave is -50 dBm or less, the gain of the low noise amplifier 21 is increased to 30 dB to improve the noise characteristics of the receiver. Since the output is easily distorted when the interference wave is −30 dBm or more, the gain of the low noise amplifier 21 is kept at 20 dB even if the desired wave is −50 dBm or less.

  As described above, according to the first embodiment, the level information of the desired wave and the interference wave can be obtained simultaneously. Further, since the gain settings of the low noise amplifier 21 and the mixer 31 are set based on a simple combination of the binary signals P1 and P2 as shown in FIG. 5, the calculation is simple and the calculation can be performed in a short time. Therefore, it is possible to set the gain suitable for the reception situation in a short time using a small circuit.

  The first and second band pass filters 71 and 72 may receive the output signal of the amplifier 41. In particular, when the mixer 31 is a current output type, it is convenient to supply the voltage output signal of the amplifier 41 to the first and second band pass filters 71 and 72. In this case, the mixer 31 and the amplifier 41 can be regarded as a voltage output type mixer.

<< Second Embodiment >>
FIG. 6 shows the configuration of a receiver according to the second embodiment of the present invention. The receiver shown in FIG. 6 further includes a third bandpass filter (third BPF) 73 and a third peak detector (PDET3) 83 in addition to the configuration shown in FIG. The third band pass filter 73 has a third frequency characteristic different from the second frequency characteristic of the second band pass filter 72 and receives the output signal of the amplifier 41. The third peak detector 83 is a circuit that detects the peak level of the output signal of the third bandpass filter 73. The control unit 92 selects at least one of the low noise amplifier 21, the mixer 31, and the amplifier 41 according to the output signals P1, P2, and P3 of the first, second, and third peak detectors 81, 82, and 83, respectively. It has a function to control two gains.

  For example, the first and third band pass filters 71 and 73 do not attenuate the desired wave, but attenuate the interference wave by 20 dB. The second bandpass filter 72 does not attenuate the interference wave, but attenuates the desired wave by 20 dB. The third peak detector 83 can be realized with the same circuit configuration as the first and second peak detectors 81 and 82.

  FIG. 7 shows an example of table information used by the control unit 92 in FIG. The output signals P1, P2, and P3 of the first, second, and third peak detectors 81, 82, and 83 are binary signals of “0” or “1”, respectively, and the threshold value is set to −10 dBm. That is, the signals P1 and P3 are set to “1” when the desired wave is −10 dBm or more or the interference wave is +10 dBm or more, and the signal P2 is set to “1” when the desired wave is +10 dBm or more or the interference wave is −10 dBm or more. The gain for the desired wave of the low noise amplifier 21 can be set to 30 dB, 20 dB or 0 dB, the gain for the desired wave of the mixer 31 can be set to 20 dB or 0 dB, and the gain for the desired wave of the amplifier 41 can be set to 20 dB or 0 dB. And The gain for the interference wave of the low noise amplifier 21 is assumed to be equal to the gain for the desired wave. The gains of the mixer 31 and the amplifier 41 with respect to the disturbing wave are assumed to be 20 dB lower than the gains with respect to each desired wave.

  Based on the above assumptions, the control unit 92 sets the gain settings of the low noise amplifier 21, the mixer 31, and the amplifier 41 to 20 dB, respectively, and the control unit 92 sets each of the first, second, and third peak detectors 81, 82, and 83. Observe the output signals P1, P2, P3. And the control part 92 controls the gain of each stage according to the table information of FIG. For example, if the interference wave is -30 dBm or less and the desired wave is -70 dBm or less, the gain of the low noise amplifier 21 is increased to 30 dB to improve the noise characteristics of the receiver. Since the output is likely to be distorted when the interference wave is −30 dBm or more, the gain of the low noise amplifier 21 is kept at 20 dB even if the desired wave is −70 dBm or less.

  As described above, according to the second embodiment, the level information of the desired wave and the disturbing wave can be obtained at the same time, and the gain setting suitable for the reception situation is made in a short time using a small circuit. It becomes possible. In addition, finer gain settings can be realized than in the case of the first embodiment.

<< Third Embodiment >>
FIG. 8 shows the configuration of a receiver according to the third embodiment of the present invention. The receiver of FIG. 8 differs from the configuration of FIG. 6 in that the second amplifier that receives the output signal of the first amplifier 41 in addition to the first amplifier (AMP1) 41 between the mixer 31 and the low-pass filter 51. An amplifier (AMP2) 42 is provided, and a fourth bandpass filter (fourth BPF) 74 and a fourth peak detector (PDET4) 84 are further provided. The fourth bandpass filter 74 is a filter that has a fourth frequency characteristic different from the second frequency characteristic of the second bandpass filter 72 and receives the output signal of the second amplifier 42. The fourth peak detector 84 is a circuit that detects the peak level of the output signal of the fourth bandpass filter 74. The control unit 92 controls the low noise amplifier 21 and the mixer 31 according to the output signals P1, P2, P3, and P4 of the first, second, third, and fourth peak detectors 81, 82, 83, and 84, respectively. , Having a function of controlling the gain of at least one of the first amplifier 41 and the second amplifier 42.

  For example, the first, third, and fourth band pass filters 71, 73, and 74 do not attenuate the desired wave, but attenuate the interference wave by 20 dB. The second bandpass filter 72 does not attenuate the interference wave, but attenuates the desired wave by 20 dB. The fourth peak detector 84 can be realized with the same circuit configuration as the first, second and third peak detectors 81, 82 and 83.

  FIG. 9 shows an example of table information used by the control unit 92 in FIG. The output signals P1, P2, P3, and P4 of the first, second, third, and fourth peak detectors 81, 82, 83, and 84 are binary signals of “0” or “1”, respectively. Set to -10 dBm. In other words, the signals P1, P3, and P4 are set to be “1” when the desired wave is −10 dBm or more or the interference wave is +10 dBm or more, and the signal P2 is set to “1” when the desired wave is +10 dBm or more or the interference wave is −10 dBm or more. To do. The gain for the desired wave of the low noise amplifier 21 can be set to 30 dB, 20 dB or 0 dB, the gain for the desired wave of the mixer 31 can be set to 20 dB or 0 dB, and the gain for the desired wave of the first amplifier 41 is 20 dB or 0 dB. The gain for the desired wave of the second amplifier 42 can be set to 20 dB or 0 dB. The gain for the interference wave of the low noise amplifier 21 is assumed to be equal to the gain for the desired wave. The gains of the mixer 31, the first amplifier 41, and the second amplifier 42 with respect to the disturbing wave are assumed to be 20 dB lower than the gains with respect to each desired wave.

  Based on the above premise, the gain setting of the low noise amplifier 21, the mixer 31, the first amplifier 41, and the second amplifier 42 is set to 20 dB, and the control unit 92 performs the first, second, third, and fourth gains. The output signals P1, P2, P3 and P4 of the peak detectors 81, 82, 83 and 84 are observed. And the control part 92 controls the gain of each step according to the table information of FIG. For example, if the interference wave is -30 dBm or less and the desired wave is -70 dBm or less, the gain of the low noise amplifier 21 is increased to 30 dB to improve the noise characteristics of the receiver. Since the output is likely to be distorted when the interference wave is −30 dBm or more, the gain of the low noise amplifier 21 is kept at 20 dB even if the desired wave is −70 dBm or less.

  As described above, according to the third embodiment, the level information of the desired wave and the disturbing wave can be obtained at the same time, and the gain setting suitable for the reception situation is made in a short time using a small circuit. It becomes possible. In addition, finer gain settings can be realized than in the second embodiment.

<< Fourth Embodiment >>
FIG. 10 shows the configuration of a receiver according to the fourth embodiment of the present invention. The receiver of FIG. 10 includes a first antenna (ANT1) 11, a first low noise amplifier (LNA1) 21, a first mixer (MIX1) 31, a second antenna (ANT2) 12, Two low noise amplifiers (LNA2) 22, a second mixer (MIX2) 32, an adder 110, an amplifier (AMP) 41, a low pass filter (LPF) 51, an AD converter (ADC) 61, Demodulation circuit 91, first bandpass filter (first BPF) 71, first peak detector (PDET1) 81, second bandpass filter (second BPF) 72, and second peak detector ( PDET2) 82, a control unit 92, and a table information storage unit 100. The control unit 92 controls the first and second low noise amplifiers 21 and 22 and the first and second mixers 31 according to the output signals P1 and P2 of the first and second peak detectors 81 and 82, respectively. , 32, and a function of controlling on / off of the adding operation of the adder 110.

  When the adding operation of the adder 110 is off, the adder 110 outputs the output signal of the first mixer 31 as it is to the amplifier 41, the first band pass filter 71, and the second band pass filter 72. Since it is supplied, the receiver of FIG. 10 has the same configuration as the receiver of FIG.

  On the other hand, when the addition operation of the adder 110 is on, the adder 110 adds the output signal of the first mixer 31 and the output signal of the second mixer 32. At this time, since the second mixer 32 has a function of adjusting the output phase, the interference wave from the first antenna 11 and the interference wave from the second antenna 12 can be weakened (referred to as diver synthesis). ).

  FIG. 11 shows an example of table information used by the control unit 92 in FIG. The output signals P1 and P2 of the first and second peak detectors 81 and 82 are binary signals of “0” or “1”, respectively, and the threshold value is set to −10 dBm. That is, the signal P1 is set to “1” when the desired wave is −10 dBm or more or the disturbing wave is +10 dBm or more, and the signal P2 is set to “1” when the desired wave is +10 dBm or more or the disturbing wave is −10 dBm or more. The gain for the desired wave of the first and second low noise amplifiers 21 and 22 can be set to 30 dB, 20 dB or 0 dB, and the gain for the desired wave of the first and second mixers 31 and 32 can be set to 20 dB or 0 dB. And The gain for the interference wave of the first and second low noise amplifiers 21 and 22 is assumed to be equal to the gain for the desired wave. The gain of the first and second mixers 31 and 32 with respect to the disturbing wave is assumed to be 20 dB lower than that with respect to the desired wave.

  Based on the above assumption, the gain setting of the first low noise amplifier 21 and the first mixer 31 is set to 20 dB, respectively, and the control unit 92 outputs the output signals of the first and second peak detectors 81 and 82, respectively. P1 and P2 are observed. And the control part 92 controls the gain of each step according to the table information of FIG. For example, if the interference wave is -30 dBm or less and the desired wave is -50 dBm or less, the gain of the first low noise amplifier 21 is increased to 30 dB to improve the noise characteristics of the receiver. Since the output is likely to be distorted when the interference wave is −30 dBm or more, the gain of the first low noise amplifier 21 is kept at 20 dB even if the desired wave is −50 dBm or less. Also, by turning on the addition operation of the adder 110, diver synthesis is performed to improve the distortion characteristics of the circuits after the amplifier 41.

  As described above, according to the fourth embodiment, the level information of the desired wave and the disturbing wave can be obtained at the same time using the diver synthesis, and the reception status can be obtained in a short time using a small circuit. It is possible to set the gain setting suitable for.

<< Fifth Embodiment >>
FIG. 12 shows the configuration of a receiver according to the fifth embodiment of the present invention. In the receiver of FIG. 12, the first and second mixers 31 and 32 in the previous stage of the adder 110 in FIG. 10 are replaced with the mixer 31 in the subsequent stage of the adder 110. The control unit 92 controls the gain of at least one of the first and second low noise amplifiers 21 and 22 and the mixer 31 according to the output signals P1 and P2 of the first and second peak detectors 81 and 82, respectively. And the function of controlling ON / OFF of the adding operation of the adder 110.

  When the adding operation of the adder 110 is off, the adder 110 supplies the output signal of the first low noise amplifier 21 to the mixer 31 as it is, so that the receiver of FIG. It becomes the same composition as the machine.

  On the other hand, when the addition operation of the adder 110 is on, the adder 110 adds the output signal of the first low noise amplifier 21 and the output signal of the second low noise amplifier 22. At this time, since the second low-noise amplifier 22 has a function of adjusting the output phase, the interference wave from the first antenna 11 and the interference wave from the second antenna 12 can be weakened (diver synthesis). Called).

  FIG. 13 shows an example of table information used by the control unit 92 in FIG. The output signals P1 and P2 of the first and second peak detectors 81 and 82 are binary signals of “0” or “1”, respectively, and the threshold value is set to −10 dBm. That is, the signal P1 is set to “1” when the desired wave is −10 dBm or more or the disturbing wave is +10 dBm or more, and the signal P2 is set to “1” when the desired wave is +10 dBm or more or the disturbing wave is −10 dBm or more. The gain for the desired wave of the first and second low noise amplifiers 21 and 22 can be set to 30 dB, 20 dB or 0 dB, and the gain for the desired wave of the mixer 31 can be set to 20 dB or 0 dB. The gain for the interference wave of the first and second low noise amplifiers 21 and 22 is assumed to be equal to the gain for the desired wave. The gain of the mixer 31 with respect to the disturbing wave is assumed to be 20 dB lower than that with respect to the desired wave.

  Based on the above assumption, the gain setting of the first low-noise amplifier 21 and the mixer 31 is set to 20 dB, respectively, and the control unit 92 outputs the output signals P1, P2 of the first and second peak detectors 81, 82, respectively. Observe. And the control part 92 controls the gain of each step according to the table information of FIG. For example, if the interference wave is -30 dBm or less and the desired wave is -50 dBm or less, the gain of the first low noise amplifier 21 is increased to 30 dB to improve the noise characteristics of the receiver. Since the output is likely to be distorted when the interference wave is −30 dBm or more, the gain of the first low noise amplifier 21 is kept at 20 dB even if the desired wave is −50 dBm or less. Further, by turning on the addition operation of the adder 110, diver synthesis is performed to improve the distortion characteristics of the circuits after the mixer 31.

  As described above, according to the fifth embodiment, the level information of the desired wave and the disturbing wave can be obtained at the same time using the diver synthesis, and the reception status can be obtained in a short time using a small circuit. It is possible to set the gain setting suitable for. In addition, the circuit scale can be reduced as compared with the case of the fourth embodiment.

  In the fourth and fifth embodiments, the same modification as the modification from the first embodiment to the second or third embodiment is possible.

  As described above, the receiver according to the present invention can obtain the level information of the desired wave and the disturbing wave at the same time, and can set the gain suitable for the reception situation in a short time using a small circuit. Therefore, it is useful for general high-frequency signal receivers.

11,12 Antenna (ANT)
21, 22 Low noise amplifier (LNA)
31, 32 Mixer (MIX)
41, 42 Amplifier (AMP)
51 Low-pass filter (LPF)
61 AD converter (ADC)
71-74 Band pass filter (BPF)
81-84 Peak detector (PDET)
90 DSP
91 demodulation circuit 92 control unit 100 table information storage unit 110 adder 121 MOS transistor 122 peak level holder 131 to 134 MOS transistor

Claims (8)

A high-frequency amplifier that amplifies the input high-frequency signal;
A mixer for converting the frequency of the output signal of the high-frequency amplifier;
A first filter having a first frequency characteristic and receiving the output signal of the mixer;
A first peak detector for detecting a peak level of an output signal of the first filter;
A second filter having a second frequency characteristic different from the first frequency characteristic and receiving an output signal of the mixer;
A second peak detector for detecting a peak level of the output signal of the second filter;
A receiver comprising: a control unit that controls at least one gain of the high-frequency amplifier and the mixer according to output signals of the first and second peak detectors. The receiver of claim 1, wherein
The first filter is a filter that attenuates the interference wave relative to the desired wave,
The receiver, wherein the second filter is a filter that attenuates the desired wave relative to the interference wave. The receiver of claim 1, wherein
Each of the first and second peak detectors includes:
A transistor receiving the input signal at the gate;
A receiver having a peak level retainer connected in series to the transistor; The receiver of claim 1, wherein
Each of the first and second peak detectors includes:
A first differential transistor pair that receives a complementary I signal at each gate;
A second differential transistor pair receiving a complementary Q signal at each gate;
A receiver having a peak level retainer connected in series with the first and second differential transistor pairs; The receiver of claim 1, wherein
An amplifier receiving the output signal of the mixer;
A third filter having a third frequency characteristic different from the second frequency characteristic and receiving the output signal of the amplifier;
A third peak detector for detecting a peak level of the output signal of the third filter;
The control unit is a receiver that controls at least one gain of the high-frequency amplifier, the mixer, and the amplifier in accordance with output signals of the first, second, and third peak detectors. The receiver according to claim 5, wherein
A second amplifier for receiving an output signal of the amplifier;
A fourth filter having a fourth frequency characteristic different from the second frequency characteristic and receiving an output signal of the second amplifier;
A fourth peak detector for detecting a peak level of the output signal of the fourth filter;
The control unit includes at least one of the high-frequency amplifier, the mixer, the amplifier, and the second amplifier according to output signals of the first, second, third, and fourth peak detectors. Receiver that controls the gain. A first high-frequency amplifier that amplifies the input first high-frequency signal;
A first mixer for frequency-converting an output signal of the first high-frequency amplifier;
A second high frequency amplifier for amplifying the input second high frequency signal;
A second mixer that has a function of adjusting an output phase and converts the output signal of the second high-frequency amplifier;
An adder for adding the output signal of the first mixer and the output signal of the second mixer;
A first filter having a first frequency characteristic and receiving an output signal of the adder;
A first peak detector for detecting a peak level of an output signal of the first filter;
A second filter having a second frequency characteristic different from the first frequency characteristic and receiving an output signal of the adder;
A second peak detector for detecting a peak level of the output signal of the second filter;
Controls the gain of at least one of the first and second high-frequency amplifiers and the first and second mixers according to the output signals of the first and second peak detectors, and performs the addition And a control unit for controlling on / off of the addition operation of the receiver. A first high-frequency amplifier that amplifies the input first high-frequency signal;
A second high-frequency amplifier having a function of adjusting the output phase and amplifying the input second high-frequency signal;
An adder for adding the output signal of the first high-frequency amplifier and the output signal of the second high-frequency amplifier;
A mixer for frequency converting the output signal of the adder;
A first filter having a first frequency characteristic and receiving the output signal of the mixer;
A first peak detector for detecting a peak level of an output signal of the first filter;
A second filter having a second frequency characteristic different from the first frequency characteristic and receiving an output signal of the mixer;
A second peak detector for detecting a peak level of the output signal of the second filter;
In accordance with the output signals of the first and second peak detectors, the gain of at least one of the first and second high-frequency amplifiers and the mixer is controlled, and the addition operation of the adder is turned on. A receiver including a control unit that controls off.

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