WO2002078175A1 - Amplificateur a correction aval - Google Patents

Amplificateur a correction aval Download PDF

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Publication number
WO2002078175A1
WO2002078175A1 PCT/JP2001/004289 JP0104289W WO02078175A1 WO 2002078175 A1 WO2002078175 A1 WO 2002078175A1 JP 0104289 W JP0104289 W JP 0104289W WO 02078175 A1 WO02078175 A1 WO 02078175A1
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WIPO (PCT)
Prior art keywords
power
detector
output
input signal
circuit
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Application number
PCT/JP2001/004289
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English (en)
Japanese (ja)
Inventor
Kenichi Horiguchi
Masatoshi Nakayama
Yukio Ikeda
Osami Ishida
Keiji Morishita
Yoshinori Yasunaga
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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Publication of WO2002078175A1 publication Critical patent/WO2002078175A1/fr

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Classifications

    • 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
    • H03F1/3223—Modifications of amplifiers to reduce non-linear distortion using feed-forward
    • H03F1/3229—Modifications of amplifiers to reduce non-linear distortion using feed-forward using a loop for error extraction and another loop for error subtraction

Definitions

  • the present invention relates to a feedforward amplifier used for satellite communication, terrestrial microwave communication, and mobile communication.
  • FIG. 1 is a block diagram showing a configuration of a conventional feedforward amplifier created with reference to a feedforward amplifier disclosed in, for example, Japanese Patent Publication No. 2799911.
  • 1 is a distortion detection circuit
  • 2 is a distortion removal circuit
  • 3 is a main amplifier signal path
  • 4 is a linear signal path
  • 5 is a main amplifier output path
  • 6 is a distortion injection path.
  • the first loop, the distortion detection circuit 1 is composed of the main amplifier signal path 3 and the linear signal path 4.
  • the second loop, the distortion removal circuit 2 is composed of the main amplifier output path 5 and the distortion injection path 6. It is configured.
  • Fig. 1 11 is a power divider, 12 is a vector regulator, 13 is a pilot signal oscillator, 14 is a directional coupler, 15 is a main amplifier, and 20 is power combining.
  • 2 1 is a directional coupler
  • 2 2 is a vector regulator
  • 2 3 is an auxiliary amplifier
  • 2 4 is a power combiner
  • 3 0 is a linear signal path
  • 3 1 is an input terminal
  • 3 2 is an output terminal
  • 33 is a directional coupler
  • 34 is a detector
  • 35 is a detector
  • 36 is a control circuit.
  • Input terminal 3 1 The input signal obtained is distributed to the main amplifier signal path 3 and the linear signal path 4 by the power divider 11 and then power-combined by the power combiner 20. Part of the signal output from the power combiner 20 to the strain injection path 6 is input to the detector 34 via the directional coupler 21.
  • the control circuit 36 controls the vector adjuster 12 of the distortion detection circuit 1 so that the power of the input signal detected by the detector 34 is minimized.
  • the vector adjuster 12 adjusts the amplitude and phase of the input signal. As a result, in the path from the power combiner 20 to the distortion injection path 6, the input signal component is canceled, and in the distortion injection path 6, an unnecessary distortion due to the nonlinear distortion component generated from the main amplifier 15 and the pilot signal. A signal is input.
  • the pilot signal output from the oscillator 13 is combined with the input signal by the directional coupler 14 and then input to the power combiner 20 to the main amplifier output path 5 and the distortion injection path 6. Be distributed.
  • the signals on the main amplifier output path 5 and the distortion injection path 6 are power-combined by the power combiner 24, and the input signal on the main amplifier output path 5 and the unnecessary wave signal on the distortion injection path 6 are combined.
  • a part of the synthesized signal is input to the detector 35 via the directional coupler 33, and the detector 35 is a non-linear distortion component generated from the main amplifier 15 and an unnecessary wave due to a pilot signal.
  • the control circuit 36 that detects the power of the signal controls the vector adjuster 22 of the distortion removal circuit 2 so that the power of the unnecessary wave signal detected by the detector 35 is minimized.
  • the vector adjuster 22 adjusts the amplitude and phase of the unnecessary wave signal.
  • the power combiner 24 cancels the unnecessary wave signal due to the nonlinear distortion component and the pilot signal component generated from the main amplifier 15, and outputs an output signal in which the unnecessary wave signal is reduced.
  • the pilot signal can be regarded as an unnecessary wave signal generated from the main amplifier 15 in the same way as the distortion component generated from the main amplifier 15.
  • FIG. 2 is a diagram showing the power characteristics of the unnecessary wave signal detected by the detector 35 with respect to the control voltage of the vector adjuster 22 of the distortion removal circuit 2.
  • a pilot signal of a frequency fp set outside the frequency band (f1 to f2) of the input signal is output.
  • the power of the unnecessary wave signal including the pilot signal is detected by considering it as the distortion component generated from the main amplifier 15, and as shown in FIG. 2, the power of the detected unnecessary wave signal is minimized (P min By controlling the control voltage of the vector adjuster 22 so as to satisfy), the unnecessary wave signal including the pilot signal is canceled, that is, the distortion component generated from the main amplifier 15 is canceled.
  • FIG. 3 is a diagram showing a temporal change in the power of the unnecessary wave signal detected by the detector 35.
  • Pa is a case where the power is relatively small, which is about the same as the noise level.
  • b is the case of relatively large power, and the vertical axis is shown as logarithmic value.
  • FIG. 4 is a diagram showing a temporal change of the control voltage output from the control circuit 36 to the vector adjuster 22.
  • Xa is an unnecessary wave signal detected by the detector 35. Is the control voltage in the case of P a in FIG. 3, and X b is the control voltage in the case of P b in FIG.
  • the control voltage output from the control circuit 36 is a stable voltage, but is unnecessary. If the power of the wave signal is relatively small, the control circuit 36 The control voltage output from the control circuit changes, and the control voltage applied to the vector regulator 22 does not converge.
  • the power of the input signal detected by the detector 34 in FIG. 1 and the control voltage output from the control circuit 36 to the vector adjuster 12 are also shown in the characteristics shown in FIGS. 3 and 4. It is in the same state as.
  • the conventional feedforward amplifier is configured as described above, the power of the unnecessary signal output from the distortion removal circuit 2 and detected by the detector 35 is as low as the noise level. In this case, since the control voltage output from the control circuit 36 to the vector adjuster 22 of the distortion removing circuit 2 does not converge, there is a problem that a stable distortion removing operation cannot be performed. .
  • the control circuit 36 sends the vector adjuster of the distortion detection circuit 1 There is a problem that stable distortion detection operation cannot be performed because the control voltage output to 12 does not converge.
  • the present invention has been made to solve the above-described problem, and is intended for a case where the power of the unnecessary wave signal output from the distortion removal circuit 2 and detected by the detector 35 is as low as the noise level.
  • the present invention provides a method for controlling the distortion detection circuit 1 through the control circuit 36 when the power of the input signal output from the distortion detection circuit 1 and detected by the detector 34 is as low as the noise level.
  • An object of the present invention is to obtain a feedforward amplifier that converges a control voltage output to a vector adjuster 12 and performs a stable distortion detection operation. Disclosure of the invention
  • a feedforward amplifier includes: a distortion detection circuit that amplifies an input signal by a main amplifier and combines the input signal with a distributed input signal to detect an unnecessary wave signal due to a distortion component of the main amplifier; The unnecessary signal detected by the distortion detection circuit is adjusted in amplitude and phase by a vector adjuster and combined with the output of the main amplifier to output an output signal in which the unnecessary signal is reduced. And a detector for detecting the power of the unnecessary wave signal due to the distortion component of the main amplifier included in the output signal output from the distortion removal circuit.
  • a control circuit that outputs a control voltage to be applied to the vector regulator so that the power of the unnecessary wave signal is reduced; and a power supply of the unnecessary wave signal detected by the detector that is a predetermined threshold.
  • an averaging circuit that averages the control voltage from the control circuit and outputs the averaged control voltage to the vector regulator when the voltage is smaller than the above. Therefore, there is an effect that the distortion removing circuit can perform a stable distortion removing operation.
  • a feedforward amplifier includes: a distortion detection circuit that amplifies an input signal by a main amplifier and combines the input signal with a distributed input signal to detect an unnecessary wave signal due to a distortion component of the main amplifier;
  • the unnecessary signal detected by the distortion detection circuit is adjusted in amplitude and phase by a vector adjuster and combined with the output of the main amplifier to output an output signal in which the unnecessary signal is reduced.
  • a comparator that compares the power of the main signal with a predetermined threshold and outputs a comparison result, and a control that is applied to the vector adjuster so as to minimize the power of the unnecessary signal detected by the detector.
  • a control circuit that outputs a voltage, a switch that switches an output destination of the control voltage from the control circuit based on a comparison result of the comparator, and an unnecessary signal detected by the detector as a result of the comparison by the comparator.
  • an averaging circuit for averaging the control voltage from the switch when the power of the wave signal is smaller than a predetermined threshold and outputting the average to the vector adjuster.
  • the pilot signal is input to the distortion detection circuit and combined with the input signal, and the detector detects the distortion component of the main amplifier and the power of the unnecessary wave signal due to the pilot signal. Things'.
  • the switcher controls the control voltage from the control circuit. This is output to the torque regulator.
  • a feedforward amplifier includes a distortion detection circuit that amplifies an input signal by a main amplifier and combines the input signal with a distributed input signal to detect an unnecessary wave signal due to a distortion component of the main amplifier.
  • the unwanted wave signal detected by the detection circuit is adjusted in amplitude and phase by a vector adjuster.
  • a distortion removal circuit that outputs an output signal from which the unnecessary wave signal has been reduced by combining the output with the output of the main amplifier, the output signal being output from the distortion removal circuit.
  • An averaging circuit that averages and outputs power, and a control circuit that outputs a control voltage to the vector adjuster so that the power of the averaged unnecessary wave signal from the averaging circuit is reduced. It is a thing.
  • the control voltage output to the vector adjuster is converged, and the distortion removal circuit can perform a stable distortion removal operation.
  • a feedforward amplifier includes: a distortion detection circuit that amplifies an input signal by a main amplifier and combines the input signal with a distributed input signal to detect an unnecessary wave signal due to a distortion component of the main amplifier;
  • the unnecessary signal detected by the distortion detection circuit is adjusted in amplitude and phase by a vector adjuster and combined with the output of the main amplifier to output an output signal in which the unnecessary signal is reduced.
  • a comparator that compares the power of the unnecessary signal with a predetermined threshold and outputs a comparison result, and switches an output destination of the unnecessary signal power from the detector based on the comparison result of the comparator.
  • the power of the unnecessary signal detected by the detector is smaller than a predetermined threshold as a result of the comparison by the converter and the comparator, the power of the unnecessary signal from the switch is averaged and output.
  • An averaging circuit, and a control circuit that outputs a control voltage to the vector regulator so as to minimize the power of the averaged unnecessary signal from the averaging circuit. is there.
  • the control voltage output to the vector adjuster is converged, and the distortion elimination circuit has an effect of performing a stable distortion elimination operation.
  • the pilot signal is input to the input signal and synthesized with the input signal, and the detector detects the distortion component of the main amplifier and the power of the unnecessary signal due to the pilot signal.
  • the feedforward amplifier according to the present invention further includes a switch that detects the unnecessary wave signal from the detector when the power of the unnecessary wave signal detected by the detector is greater than a predetermined threshold value as a result of the comparison by the comparator. Outputs power to a control circuit, and the control circuit outputs a control voltage to a vector regulator so as to minimize the power of the unnecessary wave signal detected by the detector.
  • the feedforward amplifier adjusts the amplitude and phase of the input signal using a vector adjuster, amplifies the input signal with the main amplifier, and combines the amplified input signal with the distributed input signal, thereby distorting the main amplifier.
  • a distortion detection circuit for detecting an unnecessary wave signal due to the component; an unnecessary wave signal detected by the distortion detection circuit; and an output of the main amplifier, and an output signal from which the unnecessary wave signal is reduced is output.
  • a detector for detecting the power of the input signal included in the unnecessary wave signal output from the distortion detection circuit, wherein the power of the input signal detected by the detector is reduced.
  • a control circuit for outputting a control voltage to be applied to the vector regulator An averaging circuit for averaging the control voltage from the control circuit when the power of the input signal detected by the detector is smaller than a predetermined threshold value and outputting the control voltage to the vector regulator. is there.
  • the feedforward amplifier adjusts the amplitude and phase of the input signal using a vector adjuster, amplifies the input signal with the main amplifier, and combines the amplified input signal with the distributed input signal, thereby obtaining a distortion component of the main amplifier.
  • a distortion detection circuit that detects an unnecessary wave signal; a distortion removal circuit that outputs an output signal from which the unnecessary wave signal is reduced by combining an output of the main amplifier with the unnecessary wave signal detected by the distortion detection circuit.
  • a comparator for comparing and outputting a comparison result, and a control for outputting a control voltage to be applied to the vector regulator so as to minimize the power of the input signal detected by the detector.
  • a control circuit a switch for switching an output destination of a control voltage from the control circuit based on a comparison result of the comparator, and a power of an input signal detected by the detector as a result of the comparison by the comparator.
  • an averaging circuit for averaging the control voltage from the switch when the value is smaller than the threshold value and outputting the control voltage to the vector adjuster.
  • the feedforward amplifier As a result of the comparison by the comparator, the power of the input signal detected by the detector is larger than a predetermined threshold.
  • the threshold When the threshold is high, the switch outputs the control voltage from the control circuit to the vector regulator.
  • the feedforward amplifier adjusts the amplitude and phase of the input signal using a vector adjuster, amplifies the input signal with the main amplifier, and combines the amplified input signal with the distributed input signal, thereby obtaining a distortion component of the main amplifier.
  • a distortion detection circuit that detects an unnecessary wave signal; a distortion removal circuit that outputs an output signal from which the unnecessary wave signal is reduced by combining an output of the main amplifier with the unnecessary wave signal detected by the distortion detection circuit.
  • a detector for detecting the power of the input signal included in the unnecessary wave signal output from the distortion detection circuit, and the power of the input signal detected by the detector is determined by a predetermined threshold value.
  • an averaging circuit that averages and outputs the power of the input signal from the detector, and the power of the averaged input signal from the averaging circuit decreases. Is a control voltage in which a control circuit for outputting to the pair-vector adjuster.
  • the feedforward amplifier adjusts the amplitude and phase of the input signal by a vector adjuster, amplifies the input signal by the main amplifier, and combines the amplified input signal with the distributed input signal to thereby obtain a distortion component of the main amplifier.
  • a distortion detection circuit that detects an unnecessary wave signal due to the above, an unnecessary wave signal detected by the distortion detection circuit, and a distortion that outputs an output signal with the unnecessary wave signal reduced by combining the output of the main amplifier.
  • a detection circuit for detecting the power of the input signal included in the unnecessary wave signal output from the distortion detection circuit.
  • a comparator that compares the power of the input signal detected by the detector ′ with a predetermined threshold and outputs a comparison result; and the power of the input signal from the detector based on the comparison result of the comparator.
  • the power of the input signal detected by the detector is smaller than a predetermined threshold as a result of the comparison by the switch and the switch that switches the output destination of the output, the power of the input signal from the switch is averaged.
  • a control circuit that outputs a control voltage to the vector regulator so as to minimize the power of the averaged input signal from the averaging circuit. It is.
  • the feedforward amplifier according to the present invention also includes a switch that, when the power of the input signal detected by the detector is larger than a predetermined threshold value as a result of the comparison by the comparator, sets the power of the input signal from the detector to To the control circuit, and the control circuit outputs a control voltage to the vector adjuster so as to minimize the power of the input signal detected by the detector.
  • O 0 in Proc view Figure 1 is showing a structure of a conventional Fidofowa once amplifier
  • FIG. 2 is a diagram showing power characteristics of an unnecessary wave signal with respect to a control voltage of a vector adjuster of a distortion removing circuit in a conventional feedforward amplifier.
  • FIG. 3 is a diagram showing a temporal change of the power of the unnecessary wave signal in the conventional feedforward amplifier.
  • FIG. 4 is a diagram showing a temporal change of a control voltage in a conventional feedforward amplifier.
  • FIG. 5 is a block diagram showing a partial configuration of the feedforward amplifier according to Embodiment 1 of the present invention.
  • FIG. 6 is a diagram showing a relationship between a temporal change in the power of the unnecessary wave signal and a predetermined threshold value Ps in the feedforward amplifier according to the first embodiment of the present invention.
  • FIG. 7 is a diagram showing a temporal change of a control voltage in the feedforward amplifier according to the first embodiment of the present invention.
  • FIG. 8 is a block diagram showing a partial configuration of a feedforward amplifier according to Embodiment 2 of the present invention.
  • FIG. 9 is a diagram showing a relationship between the temporal change of the power of the unnecessary signal and the averaged power of the unnecessary signal in the feedforward amplifier according to the second embodiment of the present invention and a predetermined threshold value Ps. It is.
  • FIG. 10 is a block diagram showing a partial configuration of a feedforward amplifier according to Embodiment 3 of the present invention.
  • FIG. 11 is a diagram showing a relationship between a temporal change in power of an input signal and a predetermined threshold value Ps in a feedforward amplifier according to Embodiment 3 of the present invention.
  • FIG. 12 is a block diagram showing a partial configuration of a feedforward amplifier according to Embodiment 4 of the present invention.
  • FIG. 13 is a diagram showing a relationship between a temporal change of an input signal power and an averaged input signal power in a feedforward amplifier according to Embodiment 4 of the present invention, and a predetermined threshold value P s.
  • FIG. 5 is a block diagram showing a partial configuration of the feedforward amplifier according to the first embodiment of the present invention.
  • 51 is a comparator that compares the power of the unnecessary wave signal detected by the detector 35 with a predetermined threshold and outputs a comparison result
  • 52 is a control circuit 3 based on the comparison result of the comparator 51.
  • 6 is a switch for switching the output destination of the control voltage output to the vector adjuster 22;
  • 53 is an averaging circuit for averaging the control voltage from the switch 52; This is equivalent to the configuration shown in FIG.
  • FIG. 5 Although only a part of the configuration of the feedforward amplifier is shown in FIG. 5, the configuration in which a comparator 51, a switch 52, and an averaging circuit 53 are added to the conventional configuration shown in FIG. Configuration.
  • the input signal of the main amplifier output path 5 and the undesired wave signal of the distortion injection path 6 are power-combined by the power combiner 24, and part of the signal is input to the linear signal path 30 via the directional coupler 33 Is done.
  • the detector 35 detects the power of the unnecessary wave signal due to the nonlinear distortion component and the pilot signal component generated from the main amplifier 15, and the control circuit 36 detects the power of the unnecessary wave signal detected by the detector 35.
  • the control voltage that minimizes the output is output.
  • FIG. 6 is a diagram showing a relationship between a temporal change in the power of the unnecessary wave signal detected by the detector 35 and a predetermined threshold value Ps, wherein Pa and Pb are shown in FIG. Is the same as the one.
  • the power of the unnecessary wave signal detected by the detector 35 is relatively small as much as the noise level, as shown in FIG. Whether it is Pa or a relatively large power level Pb is compared with a predetermined threshold value Ps, and the comparison result is output.
  • the switch 52 switches the output destination of the control voltage output from the control circuit 36 to the vector adjuster 22 based on the comparison result of the comparator 51. That is, when the power of the unnecessary wave signal detected by the detector 35 is larger than the predetermined threshold value Ps, the switch 52 changes the control voltage from the control circuit 36 to the vector adjuster 22. When the power of the unnecessary wave signal detected by the detector 35 is smaller than the predetermined threshold value Ps, the switch 52 applies the control voltage from the control circuit 36 to the averaging circuit 53. Output.
  • the averaging circuit 53 integrates the control voltage output from the switch 52, that is, the control voltage when the power of the unnecessary wave signal detected by the detector 35 is smaller than a predetermined threshold Ps.
  • Averaging by FIG. 7 is a diagram showing a temporal change of the control voltage output to the vector regulator 22.
  • the averaging circuit 53 averages the control voltage output from the control circuit 36 when the power of the unnecessary wave signal detected by the detector 35 is smaller than a predetermined threshold value Ps. As shown in FIG. 7, the converged control voltage Xa is output to the vector regulator 22.
  • the vector adjuster 22 adjusts the amplitude and phase of the unnecessary wave signal based on the converged control voltage Xa from the control circuit 36, and thereby adjusts the unnecessary wave signal detected by the detector 35. Even when the power is smaller than the predetermined threshold value Ps, the distortion removal circuit 2 performs a stable distortion removal operation. Other operations are the same as the conventional operations.
  • the averaging circuit 53 averages the control voltage from the control circuit 36 to obtain the average. If the power of the unnecessary signal detected by the detector 35 is larger than the predetermined threshold Ps, The switch 52 directly outputs the control voltage from the control circuit 36 to the vector adjuster 22, thereby suppressing the reduction of the convergence speed due to the averaging process to the minimum required.
  • the averaging circuit 53 When the power of the unnecessary wave signal detected by the detector 35 is smaller than the predetermined threshold Ps, the averaging circuit 53 The control voltage output to the vector adjuster 22 is converged by averaging the control voltages of the two and outputting the vector to the vector adjuster 22, so that the distortion removing circuit 2 performs a stable distortion removing operation. The effect that can be obtained is obtained.
  • the averaging circuit 53 performs averaging processing of the control voltage from the control circuit 36 by changing the power of the unnecessary wave signal detected by the detector 35 to the predetermined threshold P s.
  • FIG. 8 is a block diagram showing a partial configuration of a feedforward amplifier according to Embodiment 2 of the present invention.
  • 54 is a switch for switching the output destination of the power of the unnecessary wave signal detected by the detector 35 based on the comparison result of the comparator 51
  • 55 is a switch for the unnecessary wave signal from the switch 54.
  • This is an averaging circuit for averaging power, and the other configuration is the same as the configuration shown in FIG. 5 of the first embodiment.
  • FIG. 8 Although only a part of the configuration of the feedforward amplifier is shown in FIG. 8, a configuration in which a comparator 51, a switch 54, and an averaging circuit 55 are added to the conventional configuration shown in FIG. Configuration.
  • the operations of the detector 35 and the comparator 51 are the same as in the first embodiment.
  • the switch 54 switches the output destination of the power of the unnecessary wave signal detected by the detector 35 based on the comparison result of the comparator 51. That is, when the power of the unnecessary wave signal detected by the detector 35 is larger than the predetermined threshold value Ps, the switch 54 directly outputs the unnecessary wave signal power from the detector 35 to the control circuit 36. When the power of the unnecessary signal detected by the detector 35 is smaller than the predetermined threshold value Ps, the switch 54 averages the power of the unnecessary signal from the detector 35. Output to circuit 55.
  • the averaging circuit 55 performs averaging by integrating the power of the unnecessary wave signal that is output from the switch 54 and is smaller than the predetermined threshold Ps detected by the detector 35.
  • Fig. 9 shows the relationship between the temporal change of the power of the unnecessary wave signal detected by the detector 35 and the power of the unnecessary wave signal averaged by the averaging circuit 55 and the predetermined threshold value Ps.
  • P a ′ indicates the power of the unnecessary wave signal averaged by the averaging circuit 55
  • P b and P s are the same as those shown in FIG.
  • the averaging circuit 55 averages the power of the unnecessary wave signal smaller than the predetermined threshold Ps detected by the detector 35, as shown in FIG.
  • the power P a 'of the unnecessary signal is output to the control circuit 36.
  • the control circuit 36 supplies the control voltage that minimizes the power of the unnecessary wave detected by the detector 35 or the power of the unnecessary wave averaged by the averaging circuit 55 to the vector regulator 2. Output to 2. That is, when the power of the unnecessary wave signal detected by the detector 35 is smaller than the predetermined threshold value Ps, the control circuit 36 controls the power of the averaged unnecessary wave signal from the averaging circuit 55. By inputting P a ′, the converged control voltage X a shown in FIG. 7 is output to the vector regulator 22.
  • the vector regulator 22 adds the converged control voltage Xa from the control circuit 36.
  • the distortion removing circuit 2 can stably remove the distortion. Perform the operation.
  • Other operations are the same as the conventional operations.
  • the averaging circuit 55 averages the power of the unnecessary wave signal from the detector 35.
  • the switch 54 outputs the unnecessary wave signal from the detector 35.
  • the averaging circuit 55 By averaging the power of the unnecessary wave signal of the second signal and outputting it to the control circuit 36, the control voltage output to the vector regulator 22 is converged, and the distortion removal circuit 2 performs a stable distortion removal operation. The effect that can be obtained is obtained.
  • the averaging circuit 55 averages the power of the unnecessary wave signal from the detector 35, and the power of the unnecessary wave signal detected by the detector 35 becomes a predetermined value.
  • FIG. 10 is a block diagram showing a partial configuration of a feedforward amplifier according to Embodiment 3 of the present invention.
  • 6 1 is the detector 3 4
  • the comparator 62 compares the power of the input signal detected by the above with a predetermined threshold and outputs a comparison result.
  • the comparator 62 outputs the control circuit 36 to the vector adjuster 12 based on the comparison result of the comparator 61.
  • a switch 63 for switching the output destination of the control voltage, and an averaging circuit 63 for averaging the control voltage from the switch 62, the other configuration is the same as the conventional configuration shown in FIG.
  • FIG. 10 Although only a part of the configuration of the feed-forward amplifier is shown in FIG. 10, a comparator 61, a switch 62, and an averaging circuit 63 are added to the conventional configuration shown in FIG. The added configuration becomes the entire configuration.
  • the power of the main amplifier signal path 3 and the signal of the linear signal path 4 are combined by the power combiner 20 and output to the distortion injection path 6, and a part of the signal is detected via the directional coupler 21. Entered in 3 4
  • the detector 34 detects the power of the input signal included in the unnecessary wave signal, and the control circuit 36 outputs a control voltage that minimizes the power of the input signal detected by the detector 34.
  • the comparator 61 compares the power of the input signal detected by the detector 34 with a predetermined threshold value P s and outputs a comparison result.
  • FIG. 11 is a diagram showing a relationship between a temporal change of the power of the input signal detected by the detector 34 and a predetermined threshold value Ps.
  • Pa is relatively equal to the noise level.
  • Pb is a case of a relatively large power
  • Ps is a predetermined threshold
  • the vertical axis is shown by a logarithmic value.
  • the comparator 61 determines whether the power of the input signal detected by the detector 34 is a relatively small value Pa equal to the noise level, or The power level Pb is compared with a predetermined threshold value Ps, and the comparison result is output.
  • the switch 62 switches the output destination of the control voltage output from the control circuit 36 to the vector adjuster 12 based on the comparison result of the comparator 61. That is, When the power of the input signal detected by the detector 34 is larger than the predetermined threshold value Ps, the switch 62 directly outputs the control voltage from the control circuit 36 to the vector regulator 12. If the power of the input signal detected by the detector 34 is smaller than the predetermined threshold value Ps, the switch 62 outputs the control voltage from the control circuit 36 to the averaging circuit 63.
  • the averaging circuit 63 integrates the control voltage output from the switch 62, that is, the control voltage when the power of the input signal detected by the detector 34 is smaller than a predetermined threshold value Ps, thereby integrating the average. Become That is, the averaging circuit 63 averages the control voltage output from the control circuit 36 when the power of the input signal detected by the detector 34 is smaller than the predetermined threshold Ps. As shown in FIG. 7, the converged control voltage Xa is output to the vector adjuster 12.
  • the vector adjuster 12 adjusts the amplitude and phase of the input signal with the converged control voltage Xa, so that the power of the input signal detected by the detector 34 is smaller than the predetermined threshold Ps Also in this case, the distortion detection circuit 1 performs a stable distortion detection operation. Other operations are the same as the conventional operation.
  • the averaging circuit 63 averages the control voltage from the control circuit 36 to obtain the average.
  • the switch 62 changes the control voltage from the control circuit 36. Direct output to the vector adjusters 1 and 2 minimizes the decrease in the convergence speed due to the averaging process.
  • the averaging circuit 63 When the power of the input signal detected by the detector 34 is smaller than the predetermined threshold Ps, the averaging circuit 63 The control voltage is averaged and output to the vector regulators 12 By applying the force, the control voltage output to the vector adjuster 12 is made to converge, and the effect is obtained that the distortion detection circuit 1 can perform a stable distortion detection operation.
  • the averaging circuit 63 performs the averaging process of the control voltage from the control circuit 36 by using the power of the input signal detected by the detector 34 as the predetermined threshold value Ps.
  • FIG. 12 is a block diagram showing a partial configuration of a feedforward amplifier according to Embodiment 4 of the present invention.
  • reference numeral 64 denotes a switch for switching the output destination of the power of the input signal detected by the detector 34 based on the comparison result of the comparator 61
  • reference numeral 65 denotes the power of the input signal from the switch 64.
  • This is an averaging circuit for averaging.
  • the other configuration is the same as the configuration shown in FIG. 10 of the third embodiment.
  • Fig. 12 shows only a part of the configuration of the feedforward amplifier, a comparator 61, a switch 64, and an averaging circuit 65 are added to the conventional configuration shown in Fig. 1.
  • the configuration is the entire configuration.
  • the operations of the detector 34 and the comparator 61 are the same as in the third embodiment.
  • the switch 64 switches the output destination of the power of the input signal detected by the detector 34 based on the comparison result of the comparator 61. That is, when the power of the input signal detected by the detector 34 is larger than the predetermined threshold Ps, the switch 64 directly outputs the power of the input signal from the detector 34 to the control circuit 36. And when the power of the input signal detected by the detector 34 is smaller than a predetermined threshold value P s Then, the switch 64 outputs the power of the input signal from the detector 34 to the averaging circuit 65.
  • the averaging circuit 65 performs averaging by integrating the power of the input signal output from the switch 64 and smaller than the predetermined threshold Ps detected by the detector 34.
  • FIG. 13 is a diagram showing a relationship between a temporal change in the power of the input signal detected by the detector 34 and the power of the input signal averaged by the averaging circuit 65 and a predetermined threshold value Ps.
  • P a ′ indicates the power of the input signal averaged by the averaging circuit 65
  • P b and P s are the same as those shown in FIG.
  • the averaging circuit 65 averages the power of the input signal smaller than the predetermined threshold value Ps detected by the detector 34, thereby averaging the power as shown in FIG.
  • the power P a 'of the input signal is output to the control circuit 36.
  • the control circuit 36 supplies a control voltage that minimizes the power of the input signal detected by the detector 34 or the power of the input signal averaged by the averaging circuit 65 to the vector regulator. Output to 1 and 2. That is, when the power of the input signal detected by the detector 34 is smaller than the predetermined threshold value Ps, the control circuit 36 determines the power P a 'of the averaged input signal from the averaging circuit 65. , The converged control voltage Xa shown in FIG. 7 is output to the vector regulator 12.
  • the vector adjuster 12 adjusts the amplitude and phase of the input signal with the converged control voltage Xa from the control circuit 36, thereby controlling the power of the input signal detected by the detector 34 to a predetermined value. Even if the threshold value Ps is smaller than the threshold value Ps, the distortion detection circuit 1 performs a stable distortion detection operation. Other operations are the same as the conventional operations.
  • the averaging circuit 65 when the power of the input signal detected by the detector 34 is smaller than a predetermined threshold Ps, the averaging circuit 65 The power of the input signal is averaged and output to the control circuit 36. If the power of the input signal detected by the detector 34 is larger than a predetermined threshold Ps, the switch 64 By directly outputting the power of the input signal from the detector 34 to the control circuit 36, a decrease in the convergence speed due to the averaging process is suppressed to a minimum.
  • the averaging circuit 65 By averaging the power of the input signal and outputting it to the control circuit 36, the control voltage output to the vector adjuster 12 converges, and the distortion detection circuit 1 can perform a stable distortion detection operation The effect is obtained.
  • the averaging circuit 65 performs the averaging process of the power of the input signal from the detector 34, and sets the power of the input signal detected by the detector 34 to a predetermined threshold.
  • a pilot signal is input from the oscillator 13 to the distortion detection circuit 1, and the detector 35 detects the nonlinear distortion component generated from the main amplifier 15 and the pilot signal.
  • the detector 35 detects the power of the unnecessary signal due to the non-linear distortion component generated from the main amplifier 15 without inputting the pilot signal. good.
  • the vector adjuster 12 is connected to the main amplifier signal path 3, but may be connected to the linear signal path 4.
  • first embodiment, the third embodiment, or the fourth embodiment may be combined, and the second embodiment, the third embodiment, or the third embodiment may be combined.
  • the fourth embodiment may be combined.
  • the feedforward amplifier provides the power of the unnecessary wave signal output from the distortion removal circuit and detected by the detector, or the input signal output from the distortion detection circuit and detected by the detector.
  • the power is as low as the noise level, it is suitable for converging the control voltage output to the vector regulator and performing a stable distortion detection operation or distortion removal operation.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)

Abstract

La présente invention concerne un amplificateur à correction aval qui comprend un détecteur (35) destiné à détecter la puissance d'un signal d'onde non nécessaire contenu dans le signal de sortie en provenance d'un circuit (2) d'élimination de distorsion, un comparateur (51) destiné à comparer la puissance détectées du signal d'onde non nécessaire avec une valeur seuil prédéterminée, un circuit (36) de commande destiné à produire en sortie une tension de commande à envoyer à un régleur (22) de vecteur de façon à minimiser la puissance détectée du signal d'onde non nécessaire, un dispositif (52) de commutation destiné à commuter la destination de sortie de la tension de commande en provenance du circuit (36) de commande à partir du résultat de la comparaison effectuée par le comparateur (51), un circuit (53) de calcul de moyenne qui, si la puissance du signal d'onde non nécessaire détectée est inférieure à une valeur seuil prédéterminée, calcule la moyenne de tension de commande en provenance du dispositif (52) de commutation de façon à produire en sortie la tension de commande ainsi calculée vers le régleur (22) de vecteur.
PCT/JP2001/004289 2001-03-23 2001-05-22 Amplificateur a correction aval WO2002078175A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001085866A JP2002290162A (ja) 2001-03-23 2001-03-23 フィードフォワード増幅器
JP2001-85866 2001-03-23

Publications (1)

Publication Number Publication Date
WO2002078175A1 true WO2002078175A1 (fr) 2002-10-03

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PCT/JP2001/004289 WO2002078175A1 (fr) 2001-03-23 2001-05-22 Amplificateur a correction aval

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JP (1) JP2002290162A (fr)
WO (1) WO2002078175A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0466123A1 (fr) * 1990-07-11 1992-01-15 Nippon Telegraph And Telephone Corporation Amplificateur à boucle de contre-réaction du type aval
JPH098561A (ja) * 1995-06-19 1997-01-10 Hewlett Packard Co <Hp> フィードフォワード増幅器用適応制御システム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0466123A1 (fr) * 1990-07-11 1992-01-15 Nippon Telegraph And Telephone Corporation Amplificateur à boucle de contre-réaction du type aval
JPH098561A (ja) * 1995-06-19 1997-01-10 Hewlett Packard Co <Hp> フィードフォワード増幅器用適応制御システム

Also Published As

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JP2002290162A (ja) 2002-10-04

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