WO2015186569A1 - 電力増幅装置 - Google Patents

電力増幅装置 Download PDF

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WO2015186569A1
WO2015186569A1 PCT/JP2015/065091 JP2015065091W WO2015186569A1 WO 2015186569 A1 WO2015186569 A1 WO 2015186569A1 JP 2015065091 W JP2015065091 W JP 2015065091W WO 2015186569 A1 WO2015186569 A1 WO 2015186569A1
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signal
phase
power
phase shift
amplified
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French (fr)
Japanese (ja)
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等 林
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Sophia School Corp
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Sophia School Corp
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages

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  • the present invention relates to a power amplifying apparatus used for amplifying a high-frequency signal transmitted from a transmitter in mobile communication, digital broadcasting, RFID (Radio Frequency Identification system), sensor network, radio microphone, or the like.
  • RFID Radio Frequency Identification system
  • the wireless channels are equally spaced and arranged as narrow as possible in order to effectively use a limited frequency band.
  • the interval between the radio channels is narrow, interference between the radio channels occurs.
  • interference caused by various interferences has been considered as a problem, and one of them is intermodulation distortion between transmitters.
  • the transmitter's intermodulation distortion is caused by other radio waves entering the power amplifier provided at the final stage of the transmitter from the antenna side and between the desired wave and the power amplifier. This is caused by intermodulation.
  • FIG. 7A is a diagram illustrating a configuration of a conventional power amplifying device 7.
  • FIG. 7B is a diagram for explaining a mechanism in which intermodulation distortion occurs.
  • in-phase power distribution combiners 20 and 30 are used in the power amplifying apparatus 7. That is, the desired wave signal having the frequency f D input from the input terminal 11 is distributed by the in-phase power distribution / combiner 20 into two signals having the same power and the same phase. The two signals have the same amplification characteristic and are amplified by two amplifiers 60a and 60b arranged in parallel with each other. The amplified signals are combined by the in-phase power distribution combiner 30 and output from the output terminal 12.
  • Non-Patent Document 2 discloses a conventional power amplifying apparatus 8 shown in FIG. 8 in which (2f D -f I ) type third-order intermodulation distortion and the like are improved without using an isolator.
  • the power amplifying apparatus 8 includes two amplifiers 60a and 60b having the same amplification characteristics and arranged in parallel with each other.
  • the input side and the output side of the amplifiers 60a and 60b are hybrids 50a and 70a, respectively.
  • the hybrids 50a and 70a have four terminals, and output two signals whose phases are shifted by 90 ° from each other by a signal input from one terminal.
  • Non-reflective terminators 55a and 75a are connected to one terminal 52a of the hybrid 50a and one terminal 72a of the hybrid 70a, respectively.
  • the desired wave signal having the frequency f D input from the input terminal 11 is power-distributed by the hybrid 50 a, amplified by the amplifiers 60 a and 60 b, then combined by the hybrid 70 a, and output to the output terminal 12.
  • the two amplifiers 60a and 60b are regarded as current sources according to the following equation.
  • I ( ⁇ D t, ⁇ I t) ⁇ I m, n exp ⁇ j (m ⁇ D + n ⁇ I ) t ⁇ (1)
  • ⁇ D 2 ⁇ f D
  • ⁇ I 2 ⁇ f I
  • m, n 0, ⁇ 1, ⁇ 2,...
  • I m, n I ⁇ m, -n * (* is a complex conjugate).
  • I 1 ′ ⁇ I m, n exp [j ⁇ (m ⁇ D + n ⁇ I ) t ⁇ n ⁇ / 2 ⁇ ] (3)
  • I 2 ' ⁇ I m, n exp [j ⁇ (m ⁇ D + n ⁇ I ) t ⁇ m ⁇ / 2 ⁇ ] (4)
  • m, n ⁇ to ⁇ .
  • I 1 ⁇ I m, n [exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ n ⁇ / 2) ⁇ + Exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ m ⁇ / 2 ⁇ / 2) ⁇ ]
  • I 2 ⁇ I m, n [exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ n ⁇ / 2 ⁇ / 2) ⁇ + Exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ m ⁇ / 2) ⁇ ] (6)
  • I 1 ⁇ I m, n [exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ n ⁇ / 2) ⁇ + Exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ m ⁇ / 2 + ⁇ / 2) ⁇ ]
  • I 2 ⁇ I m, n [exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ n ⁇ / 2 + ⁇ / 2) ⁇ + Exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ m ⁇ / 2) ⁇ ] (8)
  • the (2f D -f I ) type intermodulation distortion is absorbed by the non-reflective terminator 75a of the terminal 72a, and only the (2f I -f D ) type inter modulation distortion is output. It is output to the terminal 12.
  • the configuration shown in FIG. 8 can improve (2f D -f I ) -type third-order intermodulation distortion, which is highly important as a measure for intermodulation distortion between transmitters.
  • the terminal 71a is suppressed even if the (2f D -f I ) type third-order intermodulation distortion is suppressed. (2f I -f D ) type third-order intermodulation distortion and (3f D -2f I ) type fifth-order intermodulation distortion that cannot be ignored.
  • FIG. 9 is a diagram showing a configuration of a conventional power amplifying apparatus 9 in which third-order intermodulation distortion of the (2f I -f D ) type is improved without using an isolator.
  • the power amplifying device 9 has two amplifiers 60a and 60b having the same amplification characteristics and arranged in parallel with each other.
  • the input sides of the amplifiers 60a and 60b are coupled by a ⁇ / 4 power divider 40a, and the output sides of the amplifiers 60a and 60b are coupled by a ⁇ / 4 power divider / combiner 80a.
  • the desired wave signal of frequency f D inputted from the input terminal 11 is power-distributed by the ⁇ / 4 power divider 40a, amplified by the amplifiers 60a and 60b, and then synthesized by the ⁇ / 4 power-sharing synthesizer 80a. , Output to the output terminal 12.
  • the two amplifiers 60a and 60b are regarded as current sources according to the following equation.
  • I ( ⁇ D t, ⁇ I t) ⁇ I m, n exp ⁇ j (m ⁇ D + n ⁇ I ) t ⁇ (13)
  • ⁇ D 2 ⁇ f D
  • ⁇ I 2 ⁇ f I
  • m, n 0, ⁇ 1, ⁇ 2,...
  • I m, n I ⁇ m, -n * (* is a complex conjugate).
  • the desired wave is distributed through the power distributor 40a before being input to the amplifiers 60a and 60b, and the distributed waves have a phase difference of ⁇ / 4 from each other.
  • the interference wave is distributed through the power distribution synthesizer 80a on the output side before reaching the amplifiers 60a and 60b, and the distributed waves have a phase difference of ⁇ / 4. Focusing on this point, the currents I 1 ′ and I 2 ′ between the amplifiers 60a and 60b and the power distribution synthesizer 80a, that is, the currents I 1 ′ and I 2 ′ shown in FIG. Represented by
  • I 1 ′ ⁇ I m, n exp [j ⁇ (m ⁇ D + n ⁇ I ) t ⁇ n ⁇ / 4 ⁇ ]
  • I 2 ' ⁇ I m, n exp [j ⁇ (m ⁇ D + n ⁇ I ) t ⁇ m ⁇ / 4 ⁇ ]
  • m, n ⁇ to ⁇ .
  • I 1 flowing to the output terminal 12 of the power distribution synthesizer 80a is defined as shown in FIG. 9, the phase difference ⁇ / 4 by the power distribution synthesizer 80a on the output side is taken into account, and the equation ( From 15) and (16), I 1 is obtained as follows.
  • FIG. 10 is a diagram showing a configuration of a conventional power amplifying apparatus 10 in which all intermodulation distortion is improved without using an isolator (see Patent Document 1).
  • the power amplifying device 10 shown in FIG. 10 uses amplifying devices 90a and 90b equivalent to the power amplifying device 8 shown in FIG. 8 instead of the amplifiers 60a and 60b in the power amplifying device 9 shown in FIG. .
  • the amplifying device 90a is the same as the power amplifying device 8 shown in FIG.
  • the amplifying device 90b includes two amplifiers 60c and 60d, hybrids 50b and 70b, and non-reflection terminators 55b and 75b, which are connected in the same manner as the amplifying device 90a.
  • the desired wave signal of frequency f D input from the input terminal 11 is divided into four by the ⁇ / 4 power distributor 40a and the hybrids 50a and 50b, amplified by the amplifiers 60a, 60b, 60c and 60d, respectively, and then hybrid 70a. , 70b and ⁇ / 4 power distribution synthesizer 80a and output to output terminal 12.
  • the combination of the hybrid 50a, 70a and the amplifier 60a, 60b, and the hybrid 50b, 70b By the combination with the amplifiers 60c and 60d, the (2f D -f I ) type intermodulation distortion cancels each other.
  • the combination of the ⁇ / 4 power distributor 40a, the ⁇ / 4 power distribution synthesizer 80a, and the amplifiers 90a and 90b cancels out the (2f I -f D ) type intermodulation distortion. Modulation distortion can be improved.
  • the intermodulation distortion can be effectively suppressed without using an isolator. Can do.
  • the power amplifying apparatus 10 four amplifiers, four hybrids, and two ⁇ / 4 power distribution / combiners are required, which causes a problem that the amplifying apparatus becomes large.
  • the present invention has been made in view of these points, and an object thereof is to provide a small-sized power amplifying apparatus in which intermodulation distortion between transmitters is improved.
  • the first signal and the second signal having different phases ⁇ 1 , ( ⁇ 1 + p ⁇ / 3), ( ⁇ 1 + 2p ⁇ / 3) ⁇ (p is an integer excluding integer multiples of 0 and 3).
  • a signal generating means for generating a signal and a third signal, and the first signal, the second signal, and the third signal are amplified under the same conditions, respectively, and a first amplified signal, a second amplified signal, and a third amplified signal are amplified.
  • Amplifying means for generating a signal, and changing the phases of the first amplified signal, the second amplified signal, and the third amplified signal to obtain ⁇ ( ⁇ 2 + 2p ⁇ / 3), ( ⁇ 2 + p ⁇ / 3), phase shifting means for generating a first phase shift signal, a second phase shift signal, and a third phase shift signal having a phase of ⁇ 2 ⁇ , the first phase shift signal, the second phase shift signal, and the third phase shift signal.
  • a power amplifying device including a synthesizing unit that synthesizes phase signals.
  • the amplifying unit amplifies the first signal to generate the first amplified signal, and a second amplifying circuit to amplify the second signal to generate the second amplified signal.
  • a third amplification circuit that amplifies the third signal to generate the third amplification signal, and the first amplification circuit, the second amplification circuit, and the third amplification circuit have the same amplification characteristics.
  • the signal generation means changes the phase of the three distribution signals by different phases ⁇ 0, p ⁇ / 3, 2p ⁇ / 3 ⁇ and a power distribution circuit that distributes the input signal into three distribution signals in phase. May include a phase shift circuit that generates the first signal, the second signal, and the third signal.
  • the signal generation means includes a power distribution circuit that distributes an input signal to three distribution signals having different phases, and the first signal and the second signal by changing the three distribution signals by different phases.
  • the power distribution circuit includes, for example, a first phase shift circuit that generates a signal in which the phase of the input signal is relatively changed by q ⁇ / 2 (q is an integer other than 0), and the first phase shift circuit.
  • a second phase shift circuit that generates a signal in which the phase of the signal output from is relatively changed by q ⁇ / 2 (q is an integer other than 0)
  • the phase shift circuit includes: The phase of the signal generated by the first phase shift circuit and the second phase shift circuit is changed.
  • the present invention it is possible to reduce the size of the power amplifying device while improving intermodulation distortion between transmitters.
  • the simulation result of the intermodulation distortion in the power amplification apparatus using the 3 power dividers according to the third embodiment is shown. It is a figure which shows the structure of the modification of a power amplifier. It is a figure which shows the structure of the conventional power amplification apparatus. It is a figure for demonstrating the mechanism in which intermodulation distortion generate
  • FIG. 1 is a diagram illustrating a configuration of a power amplifying apparatus 1 according to the first embodiment.
  • the power amplifying apparatus 1 includes a power distributor 100a, amplifiers 60a, 60b, and 60c, and a power distribution synthesizer 110a.
  • the power distributor 100 a receives the desired wave signal having the frequency f D via the input terminal 11.
  • the power distributor 100a includes a first signal and a first signal having different phases ⁇ 1 , ( ⁇ 1 + p ⁇ / 3), ( ⁇ 1 + 2p ⁇ / 3) ⁇ (p is an integer other than integer multiples of 0 and 3). Power is distributed by generating two signals and a third signal.
  • the power divider 100a according to the present embodiment includes a first signal, a second signal that is different in phase by ⁇ 2 ⁇ / 3 with respect to the first signal, and a phase that is ⁇ 4 ⁇ / 3 with respect to the first signal. Generate different third signals.
  • the first signal is input to the amplifier 60a
  • the second signal is input to the amplifier 60b
  • the third signal is input to the amplifier 60c.
  • the amplifiers 60a, 60b, and 60c are unit amplifiers having the same amplification characteristics, and are arranged in parallel with each other between the power distributor 100a and the power distribution combiner 110a.
  • the amplifiers 60a, 60b, and 60c output a first amplified signal, a second amplified signal, and a third amplified signal, respectively.
  • the first amplified signal, the second amplified signal, and the third amplified signal output from the amplifiers 60a, 60b, and 60c are input to the power distribution combiner 110a.
  • the power distribution synthesizer 110a changes the phases of the first amplified signal, the second amplified signal, and the third amplified signal to obtain ⁇ ( ⁇ 2 + 2p ⁇ / 3), ( ⁇ 2 + p ⁇ / 3), ⁇ 2 ⁇ ( p is a first phase-shifted signal, a second phase-shifted signal, and a third phase-shifted signal having a phase of 0) and an integer other than integer multiples of 0 and 3.
  • the power distribution combiner 110 a combines the first phase shift signal, the second phase shift signal, and the third phase shift signal, and outputs the combined signal to the output terminal 12.
  • the power divider / combiner 110a has the first amplified signal, the second amplified signal, and the third amplified signal so as to cancel the phase difference generated between the first signal, the second signal, and the third signal in the power divider 100a.
  • power combining is performed.
  • the power distribution combiner 110a compares the phase of the first amplified signal with the third amplified signal by -4 ⁇ / 3 and the phase of the second amplified signal to the first The three amplified signals are compared and the signal changed by ⁇ 2 ⁇ / 3 and the third amplified signal are combined and output to the output terminal 12.
  • the two amplifiers 60a, 60b, and 60c are regarded as current sources according to the following equation.
  • I ( ⁇ D t, ⁇ I t) ⁇ I m, n exp ⁇ j (m ⁇ D + n ⁇ I ) t ⁇ (21)
  • ⁇ D 2 ⁇ f D
  • ⁇ I 2 ⁇ f I
  • m, n 0, ⁇ 1, ⁇ 2,...
  • I m, n I ⁇ m, -n * (* is a complex conjugate).
  • a desired wave input from the input terminal 11 passes through the power distributor 100a and is divided into three signal waves, and then input to the amplifiers 60a, 60b, and 60c.
  • p ⁇ 2
  • the phase of the second signal with respect to the phase of the first signal is ⁇ 2 ⁇ / 3
  • the phase of the third signal with respect to the phase of the first signal is ⁇ 4 ⁇ / 3.
  • the phases of the first amplified signal, the second amplified signal, and the third amplified signal output from the amplifiers 60a, 60b, and 60c change in the power distribution combiner 110a.
  • the phase of the third phase shift signal is ⁇ 2
  • the power distribution synthesizer 110a outputs the first phase shift signal having the phases ⁇ ( ⁇ 2 + 2p ⁇ / 3), ( ⁇ 2 + p ⁇ / 3), ⁇ 2 ⁇ , respectively.
  • the second phase shift signal and the third phase shift signal are output.
  • phase of the first phase shift signal with respect to the phase of the third phase shift signal is ⁇ 4 ⁇ / 3
  • the phase of the second phase shift signal with respect to the phase of the third phase shift signal Is -2 ⁇ / 3.
  • the interference wave input from the output terminal 12 is phased when it reaches the output side of the amplifiers 60a, 60b, 60c via the power distribution synthesizer 110a. Changes. Specifically, the disturbing wave input from the output terminal 12 is distributed to three signals whose phases are relatively changed by ⁇ 0, ⁇ 2 ⁇ / 3, ⁇ 4 ⁇ / 3 ⁇ .
  • I 1 ′ I ( ⁇ D t, ⁇ I t ⁇ 4 ⁇ / 3)
  • I 2 ' I ( ⁇ D t ⁇ 2 ⁇ / 3, ⁇ I t ⁇ 2 ⁇ / 3)
  • I 3 ' I ( ⁇ D t ⁇ 4 ⁇ / 3, ⁇ I t) (22)
  • I 1 ′ ⁇ I m, n exp [j ⁇ (m ⁇ D + n ⁇ I ) t ⁇ 4n ⁇ / 3 ⁇ ]
  • I 2 ′ ⁇ I m, n exp [j ⁇ (m ⁇ D + n ⁇ I ) t ⁇ 2 (m + n) ⁇ / 3 ⁇ ]
  • I 3 ′ ⁇ I m, n exp [j ⁇ (m ⁇ D + n ⁇ I ) t ⁇ 4m ⁇ / 3 ⁇ ] (25)
  • m, n ⁇ to ⁇ .
  • I 1 flowing to the output terminal 12 of the power distribution synthesizer 110a is defined as shown in FIG. 1, the phase differences 4 ⁇ / 3 and 2 ⁇ / 3 by the power distribution synthesizer 110a on the output side are considered.
  • I 1 is obtained as follows from the equations (23), (24), and (25).
  • I 1 ⁇ I m, n [exp ⁇ j ((m ⁇ D + n ⁇ I ) t-4 (n + 1) ⁇ / 3) ⁇ + Exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ 2 (m + n + 1) ⁇ / 3) ⁇ + Exp ⁇ j ((m ⁇ D + n ⁇ I ) t-4m ⁇ / 3) ⁇ ]
  • I 1 ⁇ I m, n [exp ⁇ j ((m ⁇ D + n ⁇ I ) t-4 (n ⁇ 1) ⁇ / 3) ⁇ + Exp ⁇ j ((m ⁇ D + n ⁇ I ) t ⁇ 2 (m + n ⁇ 1) ⁇ / 3) ⁇ + Exp ⁇ j ((m ⁇ D + n ⁇ I ) t-4m ⁇ / 3) ⁇ ]
  • the phases of the three signals distributed in the power distributor 100a are set to ⁇ 1 , ( ⁇ 1 + p ⁇ / 3), ( ⁇ 1 + 2p ⁇ / 3) ⁇ (p is 0).
  • the phases of the three signals combined in the power distribution combiner 110a are ⁇ ( ⁇ 2 + 2p ⁇ / 3), ( ⁇ 2 + p ⁇ / 3), ⁇ 2 ⁇ , so that the conventional power amplifying apparatus 10 3rd order intermodulation distortion can be improved while reducing the number of amplifiers and realizing miniaturization.
  • FIG. 2 is a diagram illustrating a configuration of the power amplifying device 2 according to the second embodiment.
  • the power amplifying device 2 uses a common-phase power divider and a delay line by a transmission line or a phase shift circuit having no frequency dependence instead of the power divider 100a in the power amplifying device 1 according to the first embodiment. It has a distributor 120a.
  • the power amplifying apparatus 2 includes a power distribution synthesizer 130a using a delay line by a transmission line or a phase shift circuit having no frequency dependency and an in-phase power distribution synthesizer, instead of the power distribution synthesizer 110a.
  • the in-phase power distributor in the power distributor 120a distributes the input signal into three distribution signals in the same phase.
  • the delay circuit or the phase shift circuit changes the phases of the three distribution signals distributed by the in-phase power distributor by different phases ⁇ 0, p ⁇ / 3, 2p ⁇ / 3 ⁇ , thereby allowing the first signal and the second signal to be changed. And a third signal is generated.
  • the delay circuit or the phase shift circuit in the power distribution combiner 130a converts the first amplified signal, the second amplified signal, and the third amplified signal generated in the amplifier 60a, the amplifier 60b, and the amplifier 60c into different phases ⁇ 0, It is changed by p ⁇ / 3, 2p ⁇ / 3 ⁇ .
  • the in-phase power distribution combiner combines three signals whose phases have changed in the delay circuit or the phase shift circuit into one signal and outputs it.
  • FIG. 3 is a diagram illustrating a configuration of the power amplifying device 3 according to the third embodiment.
  • the power amplifying device 3 includes a power distributor 140a instead of the power distributor 100a in the power amplifying device 1 according to the first embodiment.
  • the power distributor 140a generates a first signal, a second signal, and a third signal by changing the three distribution signals by different phases from each other, and a power distribution circuit that distributes the signals to three distribution signals having different phases.
  • the phase is changed by ⁇ 0, p ⁇ / 3, 2p ⁇ / 3 ⁇ by the power distribution circuit and the phase shift circuit.
  • FIG. 3 shows a three power distributor having a phase difference of 90 ° and 180 ° as the power distribution circuit.
  • the power amplifying apparatus 3 includes a power distribution synthesizer 150a instead of the power distribution synthesizer 110a.
  • the power distribution synthesizer 150a changes the first amplified signal, the second amplified signal, and the third amplified signal generated by the amplifier 60a, the amplifier 60b, and the amplifier 60c by different phases, or a delay line by a transmission line or a frequency dependence. It has an incompatible phase shift circuit.
  • the power distribution / combining device 150a includes a power distribution / combination circuit that combines the three signals after the phase has been changed by the phase shift circuit while changing the phases of the three signals by predetermined different phases. The phase is changed by ⁇ 0, p ⁇ / 3, 2p ⁇ / 3 ⁇ by the phase shift circuit and the power distribution / combination circuit.
  • FIG. 4A is a diagram illustrating a configuration of a three-power distributor 140a in which the phase difference is approximately 90 ° and 180 °.
  • the three power distributor 140a is configured by combining a hybrid 121a having a power distribution ratio of 1: 2 and a hybrid 123a having a power distribution ratio of 1: 1.
  • the hybrid 121a generates a signal in which the phase of the input signal is relatively changed by q ⁇ / 2 (q is an integer other than 0).
  • the hybrid 123a generates a signal in which the phase of the signal output from the hybrid 121a is relatively changed by q ⁇ / 2 (q is an integer other than 0).
  • q 1.
  • the two signals generated by the hybrid 123a are input to the delay circuit and are delayed by ⁇ 2 ⁇ / 3 and ⁇ 4 ⁇ / 3, respectively, as compared with the phase of the signal output from the hybrid 121a to the output terminal 125.
  • FIG. 4B is a photograph showing an example of creating the three power distributor 140a.
  • the three power distributors 140a can be realized with a simple configuration, the small power amplifying device 3 can be easily realized.
  • FIG. 5A shows a conventional power amplifying apparatus using an ideal lossless in-phase 3 power divider and an ideal lossless in-phase 3 power divider / combiner having no frequency dependency on the input side and the output side, respectively.
  • the simulation result of the intermodulation distortion which arises is shown.
  • FIG. 5B shows an ideal lossless three-power distributor having no frequency dependency that outputs signals having phases different from each other by 2 ⁇ / 3 and 4 ⁇ / 3, and signals having phases different from each other by 4 ⁇ / 3 and 2 ⁇ / 3.
  • a power amplifying device corresponding to the power amplifying device 1 and the power amplifying device 2 using an ideal lossless three-power distribution synthesizer that outputs no power on the input side and the output side, respectively. The simulation result of distortion is shown.
  • the fifth-order intermodulation distortion (3f I -2f D ) component and the seventh-order intermodulation distortion (4f D -3f I ) component remain, but the frequency of these inter-modulation distortion is outside the transmitter band. Even if it is within the frequency band or within the band, it is far from the frequency f D of the desired wave signal, so the communication quality is not affected. Therefore, it has been confirmed that a sufficient effect can be obtained by the power amplifying device according to the above embodiment.
  • FIG. 5C a higher level of intermodulation distortion remains as compared with FIG. 5B.
  • FIG. 5A it can be seen that all the third-order intermodulation distortions are suppressed in FIG. 5C.
  • the intermodulation distortion can be suppressed even with a simple configuration using the three power distributor 140a shown in FIG.
  • FIG. 6 is a diagram illustrating a configuration of a power amplification device 6 as a modification of the power amplification device 1.
  • the power amplifying apparatus 6 includes a power distributor 160a and a power distribution synthesizer 170a instead of the power distributor 100a and the power distribution synthesizer 110a in the power amplifying apparatus 1.
  • the power distributor 160a Based on the input signal input from the input terminal 11, the power distributor 160a, the second signal whose phase is different from the phase of the first signal by ⁇ / 3, and the first signal A third signal having a phase different by ⁇ 2 ⁇ / 3 with respect to the phase is generated.
  • the power distribution synthesizer 170a generates a first phase-shifted signal by changing the first amplified signal output from the amplifier 60a by -2 ⁇ / 3 as compared with the third phase-shifted signal, and outputs it from the amplifier 60b.
  • a second phase-shifted signal is generated by changing the second amplified signal by - ⁇ / 3 compared to the third phase-shifted signal, and a third phase-shifted signal is generated from the third amplified signal output from the amplifier 60c.
  • the first phase shift signal, the second phase shift signal, and the third phase shift signal are combined. Even when the power amplifying device 6 is used, all the third-order intermodulation distortions cancel each other out in three phases as in the results calculated by the equations (28) and (29) in the first embodiment. Thus, the same simulation result as in FIG. 5B can be obtained.
  • phase shift circuit not only a delay line using a transmission line but also a circuit that realizes phase shift characteristics using a lumped constant circuit element such as an inductor, a capacitor, or a resistor may be used.

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WO2021244565A1 (zh) * 2020-06-03 2021-12-09 唯捷创芯(天津)电子技术股份有限公司 射频功率放大器、射频前端模块和通信终端

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CN118696502A (zh) * 2022-02-25 2024-09-24 三菱电机株式会社 低失真放大器

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