WO2002087078A1 - Amplificateur a correction aval - Google Patents

Amplificateur a correction aval Download PDF

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Publication number
WO2002087078A1
WO2002087078A1 PCT/JP2001/006181 JP0106181W WO02087078A1 WO 2002087078 A1 WO2002087078 A1 WO 2002087078A1 JP 0106181 W JP0106181 W JP 0106181W WO 02087078 A1 WO02087078 A1 WO 02087078A1
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WIPO (PCT)
Prior art keywords
component
distortion
residual
signal
input
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Application number
PCT/JP2001/006181
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English (en)
Japanese (ja)
Inventor
Kenichi Horiguchi
Atushi Okamura
Masatoshi Nakayama
Yukio Ikeda
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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Publication of WO2002087078A1 publication Critical patent/WO2002087078A1/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
    • 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 the configuration of a conventional feedforward amplifier made with reference to the feedforward amplifier disclosed in, for example, US Pat. No. 4,394,624.
  • 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. It consists of two loops and a circuit that controls them.
  • 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.
  • 11 is a power divider
  • 12 is a vector regulator
  • 13 is a main amplifier
  • 14 is a directional coupler
  • 20 is a power divider
  • 21 is a power combiner
  • 23 is a directional coupler
  • 24 is a directional coupler
  • 25 is a vector adjuster
  • 26 is an auxiliary amplifier
  • 27 is a power combiner
  • 31 is an input terminal
  • 3 2 is an output terminal.
  • Reference numeral 33 denotes a directional coupler
  • reference numeral 35 denotes a band stop filter
  • reference numeral 36 denotes a control circuit
  • reference numeral 37 denotes a control circuit.
  • FIG. 2 is a block diagram showing the internal configuration of the control circuits 36 and 37 in FIG. 1.
  • 41 is a complex conjugate
  • 42 is a multiplier
  • 43 is a product.
  • the reference numeral 44 denotes a set value updater
  • the reference numeral 45 denotes a correlator composed of a complex conjugate unit 41, a multiplier 42, and an integrator 43.
  • the input signal input to the input terminal 31 is distributed to the main amplifier signal path 3 and the linear signal path 4 by the power distributor 11.
  • the input signal of the main amplifier signal path 3 is adjusted in amplitude and phase by the vector adjuster 12, amplified by the main amplifier 13, and input to the power divider 20.
  • the input signal of the linear signal path 4 is input to the power combiner 21 via the directional coupler 14 and is power-combined with the signal from the main amplifier 13 distributed by the power distributor 20.
  • the output from the power combiner 21 to the distortion injection path 6 becomes a distortion component generated from the main amplifier 13 with the signal component of the input signal reduced. That is, the distortion component including the residual signal component is input to the distortion injection path 6.
  • the signal component (here, V 1A (t)) of the input signal extracted from the directional coupler 14 in the distortion detection circuit 1 is input to the control circuit 36.
  • the distortion component including the residual signal component extracted from the directional coupler 23 in the distortion removing circuit 2 (here, V 1B (t)) is input to the control circuit 36.
  • the control circuit 3 6 seeking correlation between distortion component V 1B (t) containing residual signal component and the signal component V 1A (t), calculates the residual signal component contained in the distortion component V 1B (t), calculated Based on the obtained residual signal component, the set value W (t) is determined so that the residual signal component included in the distortion component V 1B (t) output from the power combiner 21 to the distortion injection path 6 is minimized. Output to the vector adjuster 12.
  • the vector adjuster 12 adjusts the amplitude and phase of the input signal from the power divider 11 based on the set value W (t) from the control circuit 36, thereby distorting the power from the power combiner 21. Residual signal included in distortion component output to injection path 6 Reduce ingredients.
  • the amplitude and phase of the distortion component including the residual signal component input to the distortion injection path 6 are adjusted by the vector adjuster 25 via the directional couplers 23 and 24, and increased by the auxiliary amplifier 26.
  • the power is then combined by the power combiner 27 with the signal component including the distortion component output from the power divider 20 on the main amplifier output path 5.
  • the distortion component generated by the main amplifier 13 is reduced, and the output signal due to the signal component including the residual distortion component is output from the directional coupler 33.
  • the distortion component containing the residual signal component extracted from the filter 24 the residual signal component is cut off by the band-stop filter 35, and the distortion component (here, V 2A (t)) is converted to the control circuit. 3 Entered in 7.
  • a signal component including a residual distortion component which is an output signal extracted from the directional coupler 33 (here, V 2B (t)) is input to the control circuit 37.
  • the control circuit 3 7 seeking the correlation between distortion component V 2A (t) and the signal component V 2B containing residual distortion component (t), calculates the residual distortion component contained in the signal component V 2B (t), Based on the calculated residual distortion component, the vector controller adjusts the set value W (t) so that the residual distortion component included in the signal component V2B (t) output from the power combiner 27 becomes minimum. 2 Output to 5.
  • the vector adjuster 25 adjusts the amplitude and phase of the distortion component including the residual signal component from the directional coupler 24 based on the set value W (t) of the control circuit 37 to obtain the power.
  • the residual distortion component included in the signal component output from the combiner 27 is reduced.
  • control of the distortion extraction circuit 1 and the control of the distortion removal circuit 2 are performed constantly or intermittently, and the output from the control circuits 36 and 37 is set.
  • the constant value W (t) the distortion component generated from the main amplifier 13 is removed, and a feedforward amplifier with good linearity can be realized.
  • the signal component V 1A (t) of the input signal extracted from the directional coupler 14 in FIG. 1 is input to the complex conjugate 41.
  • the complex conjugator 41 inverts the phase (the imaginary part of the complex number) without changing the amplitude (the real part of the complex number) of the signal component V 1A (t), and performs complex conjugate of the signal component V 1A (t).
  • V 1A (t) * is output to the multiplier 42.
  • the multiplier 42 includes a complex conjugate V 1A (t) * from the complex conjugate unit 41 and a distortion component V 1B (t) including a residual signal component extracted from the directional coupler 23 in FIG. , And the multiplication result V 1A (t) * 'V 1B (t) is calculated, and the time average of the multiplication result V u (t) * V (t) is calculated by the integrator 43.
  • the average value of the result ⁇ V 1A (t) * ⁇ V 1B (t)> is output as a residual signal component included in the distortion component V 1B (t).
  • the set value updater 44 updates the set value W (t) given to the vector adjuster 12 based on the average value of the multiplication results, V 1A (t) * ⁇ V 1B (t)>.
  • the distortion component V 2A (t) extracted from the directional coupler 24 of FIG. 1 through the band stop filter 35 is input to the complex conjugate unit 41.
  • the complex conjugator 41 inverts the phase (the imaginary part of the complex number) without changing the amplitude (the real part of the complex number) of the distortion component V 2A (t), and performs complex conjugate of the distortion component V 2A (t).
  • V 2A (t) * is output to the multiplier 42.
  • the multiplier 42 converts the complex conjugate V 2A (t) * from the complex conjugate unit 41 and the signal component V 2B (t) including the residual distortion component extracted from the directional coupler 33 in FIG. Multiply and multiply result V 2A (t) * ⁇ Calculate V 2B (t) 4 3 by more obtaining a time average of the multiplication result V 2A (t) * ⁇ V 2B (t), the average value of the multiplication result ⁇ V 2A (t) * ⁇ V 2B (t)> signal components V 2B Output as residual distortion component included in ( ⁇ ).
  • the set value updater 44 updates the set value W (t) to be given to the vector adjuster 25 based on the average value ⁇ V 2A (t) * ⁇ V 2B (t)> of the multiplication results.
  • FIG. 3 is a diagram showing the convergence characteristics of the set value W (t) output from the control circuits 36 and 37.
  • the set value W ( ⁇ ) is repeatedly updated from the initial value W o and the convergence value W m FIG.
  • the convergence characteristic 101 takes time to converge to the convergence value Wm, but each set value W (t) is stable.
  • the convergence characteristic 102 takes a long time to converge to the convergence value Wm, but each set value W (t) changes greatly and the stability decreases. Further, when the stability decreases, the set value W (t) may diverge without converging to the convergence value Wm, as shown by the convergence characteristic 103 in FIG. 3B.
  • FIG. 4 is a diagram illustrating the principle of operation of the distortion removal circuit 2.
  • FIG. 4 illustrates the algorithm of the adaptive filter and the convergence of the set value W (t).
  • V s is a signal component of the input signal
  • V d is a distortion component generated by the main amplifier 13 and is a reference signal of the control circuit 37 (adaptive filter).
  • G is the passing gain and passing phase of the auxiliary amplifier 26
  • W is the set value given to the vector adjuster 25
  • Ve is the signal component including the residual distortion component from the directional coupler 33, and Circuit 37 (adaptive fill) error signal. In this diagram, Therefore, the residual signal component output to the distortion injection path 6 is set to 0.
  • Vs + Vd in the main amplifier output path 5 is combined with the output GWVd from the auxiliary amplifier 26 by the power combiner 27.
  • the error signal V e shown in the following equation (1) is input from the directional coupler 33 to the control circuit 37.
  • V e V s + (l + G ⁇ W) ⁇ V d (1)
  • the reference signal V d from the directional coupler 24 is input to the control circuit 37.
  • the set value at the update count t is W (t) by the adaptive filter algorithm
  • the set value W (t + 1) at the update count t + 1 is expressed by the following equation (4).
  • W (t + 1) W (t)-u ⁇ d ⁇ > e (W) / aW (t) (4)
  • z is a correction coefficient
  • 3 P e (W) / aW ( n) is a partial derivative of the error signal power Pe (W) with the set value W (n), and shows the slope in the function of the error signal power Pe (W).
  • FIG. 5 is a diagram showing a function of the error signal power P e (W), where R e [W] is a real axis of the set value W, Im [W] is an imaginary axis of the set value W, and 1 1 1 is the slope of the function of the error signal power P e (W), and 1 1 2 is the error signal This is the minimum point of the power P e (W).
  • the adaptive filter algorithm determines the slope (variation) 1 11 of the error signal power Pe (W) with respect to a change in the set value W at a certain point in time, and controls the slope 1 11 1 to be minimum. This is to find the minimum point 1 1 2 of the error signal power P e (W).
  • the slope of the error signal power P e (W) includes an amplitude component and a phase component.
  • W (t + 1) W (t)-2 u G * (W) V d * V e (6)
  • Vd is input to the control circuit 37 as a reference signal
  • G (W) changes as time passes, it is not practical to preset 2 / 'G * (W) with various values.
  • FIG. 4 illustrates the distortion removal circuit 2, but the same applies to the main amplifier 13 of the distortion detection circuit 1.
  • the main amplifier 13 of the distortion detection circuit 1 In the case of the non-linear main amplifier 13, the.
  • W (t + 1) In order to converge the constant value W (t + 1), it is necessary to set 2iG * (W) to a value smaller than a predetermined threshold, and again, 2 / G * (W ) Is not realistic.
  • the conventional feedforward amplifier is configured as described above, in controlling the distortion detection circuit 1 and the distortion removal circuit 2, if the main amplifier 13 and the auxiliary amplifier 26 are non-linear, the vector There is a problem that the convergence of the set value W of the adjusters 12 and 25 is deteriorated.
  • the present invention has been made to solve the above-described problems.
  • the vector is controlled.
  • the objective is to obtain a feedforward amplifier that can reliably converge the set values W of the torque regulators 12 and 25. Disclosure of the invention
  • a feedforward amplifier divides a signal component extracted from an output of a main amplifier by a set value of a vector regulator, and includes a result of the division and a residual signal component detected by a distortion detection circuit. It has a control circuit that calculates the residual signal component included in the distortion component based on the distortion component and controls the next set value of the vector regulator.
  • a feedforward amplifier divides a distortion component extracted from an output of an auxiliary amplifier by a set value of a vector adjuster, and outputs a signal including a result of the division and a residual distortion component output from a distortion removal circuit.
  • the residual distortion component included in the signal component is calculated based on the component, and the next set value of the vector adjuster is controlled. It has a control circuit to control.
  • the feedforward amplifier divides a desired wave component obtained by synthesizing an input signal taken from the output of the main amplifier and a pilot signal by a set value of a vector adjuster.
  • a control circuit that calculates the residual desired wave component included in the distortion component based on the distortion component including the residual desired wave component detected by the distortion detection circuit and controls the next set value of the vector adjuster. It is.
  • the distortion component of the main amplifier extracted from the output of the auxiliary amplifier and the unnecessary wave component due to the pilot signal component are divided by the set value of the vector regulator, and the division result and the distortion are obtained. It has a control circuit that calculates the residual unnecessary wave component contained in the signal component based on the signal component containing the residual unnecessary wave component output from the removal circuit and controls the next set value of the vector regulator. .
  • the set value of the vector regulator output from the control circuit can be reliably converged, and the distortion detection operation can be performed accurately.
  • a feedforward amplifier inputs a signal component extracted from an output of a main amplifier and a distortion component including a residual signal component detected by a distortion detection circuit, digitizes the input signal component, The distortion component including the input residual signal component is digitized, and the digitized signal is converted. The signal is divided by the digitized set value for giving the signal component to the vector adjuster, and the correlation between the division result and the distortion component including the digitized residual signal component is calculated. A residual signal component included in the distortion component is calculated, and the calculated residual signal component is multiplied by a correction coefficient that takes into account the convergence and stability of the control of the distortion detection circuit, and is applied to a vector adjuster. It is equipped with a control circuit that updates the digitized set values, converts the updated set values into analog data, and provides the analog data to the vector regulator.
  • the control circuit multiplies the complex conjugate of the division result by the distortion component including the digitized residual signal component, and time-averages the multiplication result to be included in the distortion component. It calculates the residual signal component.
  • a feedforward amplifier inputs a signal component extracted from an output of a main amplifier and a distortion component including a residual signal component detected by a distortion detection circuit, digitizes the input signal component, and Digitizing the distortion component including the residual signal component, and dividing the digitized signal component by the digitized setting and value for providing to the vector adjuster. Is multiplied by the distortion component including the digitized residual signal component to calculate the residual signal component included in the distortion component. By multiplying by a correction coefficient considering stability, the digitized set value to be given to the vector adjuster is updated, and the updated set value is converted into an analog signal to the vector adjuster. And a control circuit.
  • the processing speed can be increased by reducing the calculation amount of the control circuit, and the response of the control system of the distortion detection circuit can be accelerated.
  • the control circuit multiplies the complex conjugate of the division result by the distortion component including the digitized residual signal component, and normalizes the multiplication result by the instantaneous power of the division result. Thus, a residual signal component included in the distortion component is detected.
  • the distortion component extracted from the output of the auxiliary amplifier and the signal component including the residual distortion component output from the distortion removal circuit are input, the input distortion component is digitized and input.
  • the signal component including the residual distortion component is digitized, and the digitized distortion component is divided by a digitized set value to be supplied to the vector adjuster.
  • Calculates the residual distortion component included in the signal component by calculating the correlation with the signal component containing the residual distortion component, and corrects the calculated residual distortion component in consideration of the convergence and stability of the control of the distortion removal circuit.
  • a control circuit for updating a digitized set value to be given to the vector adjuster by multiplying the set value and converting the updated set value into an analog signal to be given to the vector adjuster. It is.
  • control circuit may be configured to output the division result Is multiplied by a signal component including a digitized residual distortion component, and the result of the multiplication is time-averaged to calculate a residual distortion component included in the signal component.
  • the distortion component extracted from the output of the auxiliary amplifier and the signal component including the residual distortion component output from the distortion removal circuit are input, the input distortion component is digitized and input.
  • the signal component including the residual distortion component is digitized, and the digitized distortion component is divided by a digitized set value for providing to the vector adjuster.
  • the conjugate is multiplied by the signal component including the digitized residual distortion component to calculate a residual distortion component included in the signal component. Control that updates the digitized set value to be given to the vector adjuster by multiplying by a correction factor considering stability and converts the updated set value into an analog signal and gives it to the vector adjuster Equipped with a circuit It is intended.
  • the processing speed can be increased by reducing the amount of calculation in the control circuit, and the response of the control system of the distortion removal circuit can be accelerated.
  • the control circuit multiplies the complex conjugate of the division result by the signal component including the digitized residual distortion component, and normalizes the multiplication result by the instantaneous power of the division result to obtain a signal. It calculates the residual strain component contained in the component.
  • the desired signal component obtained by combining the input signal extracted from the output of the main amplifier and the pilot signal is detected by the distortion detection circuit.
  • the control circuit multiplies the complex conjugate of the division result by the distortion component including the digitized residual desired wave component, and time-averages the multiplication result and includes the result in the distortion component. This calculates the residual desired wave component to be generated.
  • the feedforward amplifier provides a desired wave component obtained by combining an input signal extracted from an output of a main amplifier and a pilot signal, and a distortion component including a residual desired wave component detected by a distortion detection circuit.
  • Input digitize the input desired wave component, digitize the distortion component including the input residual desired wave component, and perform vector adjustment of the digitized desired wave component.
  • the control circuit multiplies the complex conjugate of the division result by the distortion component including the digitized residual desired wave component, and specifies the multiplication result by the instantaneous power of the division result.
  • the residual desired wave component included in the distortion component is calculated.
  • the feedforward amplifier according to the present invention includes a signal component including an unnecessary wave component due to a distortion component of the main amplifier and a pilot signal component extracted from an output of the auxiliary amplifier, and a residual unnecessary wave component output from the distortion removal circuit.
  • a signal component including an unnecessary wave component due to a distortion component of the main amplifier and a pilot signal component extracted from an output of the auxiliary amplifier includes a residual unnecessary wave component output from the distortion removal circuit.
  • To digitize the input unnecessary wave components digitize the signal components including the input residual unnecessary wave components, and provide the digitized unnecessary wave components to the vector regulator. Divide by the digitized set value, calculate the correlation between the result of the division and the signal component including the digitized residual unnecessary wave component, and calculate the residual unnecessary wave component included in the signal component.
  • Correction of residual unwanted wave components in consideration of the convergence and stability of the control of the distortion removal circuit It is equipped with a control circuit that updates the digitized set value to be given to the vector adjuster by multiplying by a number and converts the updated set value into an analog signal and gives it to the vector adjuster. .
  • the control circuit multiplies the complex conjugate of the division result by the signal component including the digitized residual unnecessary wave component, and time-averages the multiplication result to be included in the signal component. It calculates the residual unwanted wave component.
  • the feedforward amplifier according to the present invention includes a signal component including an unnecessary wave component due to a distortion component of the main amplifier and a pilot signal component extracted from an output of the auxiliary amplifier, and a residual unnecessary wave component output from the distortion removal circuit.
  • Input digitizes the input unnecessary wave component, digitizes the input signal component including the residual unnecessary wave component, and digitizes the unnecessary unnecessary wave component to the vector adjuster.
  • the residual unnecessary wave component included in the signal component is calculated by multiplying the complex conjugate of the division result by the signal component including the digitized residual unnecessary wave component,
  • the calculated residual unwanted wave component is multiplied by a correction coefficient in consideration of the convergence and stability of the control of the distortion removal circuit, and the digitized set value to be given to the vector adjuster is updated. And, those having a control circuit for applying the updated set value to base-vector regulator to analog form.
  • the processing speed can be increased by reducing the amount of calculation in the control circuit, and the response of the control system of the distortion removal circuit can be accelerated. This has the effect.
  • the control circuit multiplies the complex conjugate of the division result by the signal component including the digitized residual unnecessary wave component, and normalizes the multiplication result by the instantaneous power of the division result. It calculates the residual unnecessary wave component included in the signal component.
  • FIG. 1 is a block diagram showing a configuration of a conventional feedforward amplifier.
  • FIG. 2 is a block diagram showing an internal configuration of a control circuit of a conventional feedforward amplifier.
  • FIG. 3 is a diagram illustrating convergence characteristics of set values output by a control circuit of a conventional feedforward amplifier.
  • FIG. 4 is a diagram illustrating the operation principle of a distortion removal circuit of a conventional feedforward amplifier.
  • FIG. 5 is a diagram showing a function of error signal power in a conventional feedforward amplifier.
  • FIG. 6 is a diagram illustrating the operation principle of the distortion removal circuit of the feedforward amplifier according to the first embodiment of the present invention.
  • FIG. 7 is a block diagram showing a configuration of a feedforward amplifier according to Embodiment 1 of the present invention. '
  • FIG. 8 is a block diagram showing an internal configuration of a control circuit of the feedforward amplifier according to Embodiment 1 of the present invention.
  • FIG. 9 is a diagram showing convergence characteristics of set values output by the control circuit of the feedforward amplifier according to Embodiment 1 of the present invention.
  • FIG. 10 is a block diagram showing an internal configuration of a control circuit of a feedforward amplifier according to Embodiment 2 of the present invention.
  • FIG. 11 is a block diagram showing an internal configuration of a control circuit of a feedforward amplifier according to Embodiment 3 of the present invention.
  • FIG. 12 is a block diagram showing a configuration of a feedforward amplifier according to Embodiment 4 of the present invention.
  • FIG. 13 is a block diagram showing a configuration of a feedforward amplifier according to Embodiment 5 of the present invention.
  • FIG. 6 is a diagram showing the operation principle of the distortion removal circuit 2 of the feedforward amplifier according to the first embodiment of the present invention, in which 38 is a divider, 39 is a control circuit as an adaptive filter, G (W) is the passing gain and passing phase of the auxiliary amplifier 26, and the other Vs, Vd, W, and Ve are the same as those shown in FIG.
  • the auxiliary amplifier 26 is a non-linear amplifier.
  • Vs + Vd in the main amplifier output path 5 is combined with the output 0 () * W.Vd from the auxiliary amplifier 26 by the power combiner 27, and
  • the error signal Ve shown in the following equation (7) is input from the coupler 33 to the control circuit 39.
  • V e V s + (1 + G (W) W)-V d (7) Also, the output G (W) 'W' V d from the directional coupler 24 is divided by the set value W output from the control circuit 39 by the divider 38 to obtain G (W)-V d Input as a reference signal for control circuit 39.
  • the error signal power Pe of the error signal Ve is expressed by the following equation (8).
  • the above equation (9) is the same as the above equation (6), but when the reference signal of the control circuit 39 is G (W) ′ Vd and the error signal is Ve, the auxiliary amplifier 26 Even if the passing gain and the passing phase G (W) change over time, and the function of the error signal power Pe in the above equation (8) changes, even if the function of the changed error signal power Pe changes as shown in FIG.
  • the minimum point 1 1 2 can be obtained from the slope 1 1 1 shown in FIG.
  • the reference signal should be G (W) ⁇ Vd instead of the reference signal Vd of the control circuit 37 shown in FIG.
  • the output G (W) .W' of the auxiliary amplifier 26 Take out V d and use divider 3 8 What is necessary is just to divide by the output W of the control circuit 39.
  • FIG. 6 is a diagram showing the principle of operation of the distortion removal circuit 2. The same applies to the distortion detection circuit 1.
  • the output G (W) ⁇ W ′ V s of the main amplifier 13 is taken out.
  • the circuit configuration may be such that the divider divides by the output W of the control circuit and the reference signal of the control circuit as an adaptive filter is G (W) ⁇ Vs.
  • FIG. 7 is a block diagram showing a configuration of the feedforward amplifier according to Embodiment 1 of the present invention.
  • reference numeral 22 denotes a directional coupler
  • reference numerals 34 and 35 denote band-stop filters
  • reference numerals 51 and 52 denote control circuits
  • other configurations include a directional coupler 24 in the distortion removal circuit 2
  • the configuration is the same as that of the conventional configuration shown in FIG.
  • FIG. 8 is a block diagram showing the internal configuration of the control circuits 51 and 53.
  • 61 is an AD converter
  • 62 is a divider
  • 63 is a complex conjugate
  • 64 is an AD converter.
  • a converter 65 is a multiplier
  • 66 is an integrator
  • 67 is a correction coefficient setter
  • 68 is a multiplier
  • 69 is a set value updater
  • 70 is a DA converter
  • 71 is a DA converter.
  • This is a correlator composed of a complex conjugate 63, a multiplier 65, and an integrator 66.
  • the signal component including the distortion component output from the main amplifier 13 is distributed in power by the power divider 20, extracted by the directional coupler 22, and extracted by the band cutoff filter 34.
  • the distortion component is cut off, and the signal component (here, V 1A (t)) is input to the control circuit 51.
  • a distortion component here, V 1B (t)
  • V 1B (t) including the residual signal component extracted from the directional coupler 23 is input to the control circuit 51.
  • the control circuit 51 includes a signal component V 1A (t) and a distortion component V 1B including a residual signal component. (t), calculate the residual signal component included in the distortion component V 1B (t), and based on the calculated residual signal component, the distortion component output from the power combiner 21 to the distortion injection path 6
  • the set value W (t) is output to the vector adjuster 12 so that the residual signal component included in V1B (t) is minimized.
  • the vector adjuster 12 adjusts the amplitude and phase of the input signal from the power divider 11 based on the set value W (t) from the control circuit 51, thereby distorting the power from the power combiner 21.
  • the residual signal component included in the distortion component output to the injection path 6 is reduced.
  • the signal component V 1A (t) extracted from the directional coupler 22 in FIG. 7 and passed through the band cut filter 34 is converted into a digital signal by the AD converter 61 in FIG.
  • the divided value is divided by the set value W (t) output from the set value updater 69 by 62, and V1A (t) / W (t) is input to the complex conjugate device 63.
  • Double-containing conjugator 6 without changing the amplitude of the signal component V 1A (t) / W ( t) (the real part that put the complex), by inverting the phase (imaginary part of a complex number), V 1A ( The complex conjugate (V 1A (t) ZW (t)) * of t) / W (t) is output to the multiplier 65.
  • the multiplier 65 includes a complex conjugate (V 1A (t) / W (t)) * from the complex conjugate unit 63 and a distortion including a residual signal component converted into a digital signal by the AD converter 64. Multiplied by the component V 1B (t), the multiplication result (V 1A (t) / W (t)) * 'V 1B (t) is calculated, and the multiplication result (V 1A (t) / W (t)) * ⁇ V 1B ( Ri by the possible to find the time average of t), the average value of the multiplication result rather than (V 1A (t) / W (t)) * ⁇ V 1B (t)> strain It is output as a residual signal component included in the component V 1B (t).
  • the correction coefficient setting device 67 has the convergence and stability of the control of the distortion detection circuit 1 according to the pass characteristic of the main amplifier 13, that is, according to the pass gain and the pass phase of the main amplifier 13.
  • a correction factor has been set in advance that takes into account
  • FIG. 9 is a graph showing the convergence characteristics of the set value W (t) output from the control circuit 51, and the set value W (t) of the control circuit 51 when the correction coefficient // is set to a parameter. This shows a case where updating is performed repeatedly.
  • the pass gain is fixed.
  • the correction coefficient ⁇ when the correction coefficient ⁇ is large, the convergence speed from the initial value Wo to the convergence value Wm is high, and the convergence is good, but the stability is poor.
  • the product A may be determined in consideration of the convergence and stability of the control, and a correction coefficient according to the pass gain of the main amplifier 13 may be set.
  • the multiplier 68 is used to adjust the residual signal component output from the integrator 66 ⁇ (V 1A (t) ZW (t)) * V1B (t)> and the correction coefficient set in the correction coefficient setting unit 67.
  • the set value change amount which is the multiplication result in consideration of the convergence and stability of the control of the distortion detection circuit 1 according to the pass characteristic of the main amplifier 13, is obtained by the following equation (11).
  • the DA converter 70 converts the set value W (t + 1) output from the set value updater 69 into an analog signal and outputs the analog signal to the vector adjuster 12.
  • the distortion component including the residual signal component output from the auxiliary amplifier 26 is taken out by the directional coupler 24, and the residual signal component is blocked by the band stop filter 35.
  • the distortion component (here, V 2A (t)) is input to the control circuit 52.
  • a signal component including a residual distortion component extracted from the directional coupler 33 (here, V 2B (t)) is input to the control circuit 52.
  • the control circuit 5 2 inputs the signal component V 2B (t) including residual distortion component and the distortion component V 2A (t), calculates the residual distortion component contained in the signal component V 2B (t), was calculated Based on the residual distortion component, the set value W (t) is set to the vector adjuster 25 so that the residual distortion component included in the signal component V2B (t) output from the power combiner 27 is minimized. Output.
  • the vector adjuster 25 adjusts the amplitude and phase of the distortion component including the residual signal component from the directional coupler 23 based on the set value W (t) from the control circuit 52, thereby achieving power synthesis.
  • the residual distortion component included in the signal component output from the device 27 is reduced.
  • V (t) extracted from the directional coupler 24 in FIG. 7 and passed through the band-stop filter 35 is converted into a digital signal by the AD converter 61 in FIG. 6 Divide by the set value W (t) output from the set value updater 6 9 by 2 Then, V 2A (t) ZW (t) is input to the complex conjugate 63.
  • the complex conjugator 63 inverts the phase (the imaginary part of the complex number) without changing the amplitude (the real part of the complex number) of the distortion component V 2A (t) / W (t) to obtain V 2A (t)
  • the complex conjugate (V 2A (t) ZW (t)) * of / W (t) is output to the multiplier 65.
  • the multiplier 65 includes a complex conjugate (V 2A (t) / W (t)) * from the complex conjugate unit 63 and a signal component V including a residual distortion component converted into a digital signal by the AD converter 64.
  • V 2A (t) / W (t)) * ⁇ V 2B (t) is calculated, and the multiplication result (V 2A (t) / w ( t)) * ⁇ V 2B (Ri by the obtaining the time average of t), the average value of the multiplication result ⁇ (v 2A (t) / W (t)) * ⁇ V 2B (t)> the signal component V Output as residual distortion component included in 2B ( ⁇ ).
  • the correction coefficient setting unit 67 has convergence and stability of the control of the distortion removal circuit 2 according to the pass characteristic of the auxiliary amplifier 26, that is, according to the pass gain and the pass phase of the auxiliary amplifier 26.
  • Correction factor // is set in advance in consideration of performance.
  • the multiplier 68 is set to the residual distortion component output from the integrator 66 ⁇ ( V2A (t) / W (t)) * V2B (t)> and the correction coefficient setting unit 67.
  • the correction factor is multiplied, and the set value change amount, which is the multiplication result in consideration of the convergence and stability of the control of the distortion elimination circuit 2 according to the pass characteristic of the auxiliary amplifier 26, is obtained by the following equation (13) To the set value updater 69.
  • Set value updater 69 is the set value at the number of updates t of vector adjuster 25
  • the result of adding the set value change amount obtained by the multiplier 68 to W (t) is defined as the set value W (t + 1) at the number of updates t + 1 by the following equation (14). Request.
  • W (t + 1) W (t) + ⁇ W
  • the DA converter 70 converts the set value W (t + 1) output from the set value updater 69 into an analog signal and outputs the analog signal to the vector adjuster 25.
  • the control circuit 51 digitizes the signal component V 1A (t) extracted from the output of the main amplifier 13 and converts the signal component V 1A (t) into the vector adjuster 12. Divide by the set value W (t) at the update count t, digitize the distortion component V 1B (t) including the residual signal component extracted from the output of the power combiner 21, and find the correlation with the division result.
  • the control circuit 52 digitizes the distortion component V 2A (t) extracted from the output of the auxiliary amplifier 26, and updates the vector adjuster 25 with the number of updates t
  • the signal component V 2B (t) including the residual distortion component extracted from the output of the power combiner 27 is digitized by dividing by the set value W (t) at, and the signal component V is obtained by calculating the correlation with the division result.
  • 2B (t) is calculated and multiplied by a correction factor / considering the convergence and stability of the control of the distortion removal circuit 2 to update the set value W (t).
  • the auxiliary amplifier 26 is nonlinear, the effect that the set value W of the vector regulator 25 output from the control circuit 52 can be surely converged is obtained. You. Embodiment 2.
  • FIG. 10 is a block diagram showing the configuration of control circuits 51 and 52 of the feedforward amplifier according to the second embodiment of the present invention. Integrator 66 is omitted from FIG. 8 of the first embodiment. Things. Further, the entire configuration of the feedforward amplifier according to the second embodiment is the same as the configuration of FIG. 7 in the first embodiment.
  • the multiplier 6.5 uses the complex conjugate (V 1A (t) / W (t)) * from the complex conjugate device 63 and the digitizer by the AD converter 64, as in the first embodiment.
  • Distortion component including residual signal component converted to evening signal V 1B
  • the multiplier 68 is used to adjust the residual signal component output from the multiplier 65 (V 1A (t) / W (t)) * V1B (t) to the correction coefficient set in the correction coefficient setting unit 67.
  • the set value change amount which is the multiplication result in consideration of the convergence and stability of the control of the distortion detection circuit 1 in accordance with the characteristics of the main amplifier 13, is obtained by the following equation (15).
  • Output to set value updater 69 is obtained by the following equation (15).
  • Set value updater 69 is the set value W (t) at vector controller 12 update frequency t Then, the result obtained by adding the set value change amount obtained by the multiplier 68 to the set value W (t + 1) at the update count t + 1 is obtained by the following equation (16).
  • the set value updater 69 sets the set value change amount AW to the minimum. Then, the set value W (t + 1) is output to the DA converter 70.
  • the output of the multiplier 65 is directly output to the multiplier 68 without obtaining the time average by the integrator 66 as in the first embodiment, so that the amount of calculation in the control circuit 51 is increased.
  • the processing speed can be increased. The same applies to the control circuit 52, and the processing speed can be increased by reducing the amount of calculation in the control circuits 5.2.
  • the output of multiplier 65 is directly output to multiplier 68 without calculating the time average by integrator 66 as in the first embodiment.
  • the response of the control system of the distortion detection circuit 1 and the distortion removal circuit 2 can be accelerated.
  • FIG. 11 is a block diagram showing a configuration of control circuits 51 and 52 of the feedforward amplifier according to Embodiment 3 of the present invention.
  • ⁇ 2 is an instantaneous power detector
  • 73 is a divider
  • the other configuration is the same as the configuration of FIG. 10 in the second embodiment.
  • the entire configuration of the feedforward amplifier according to the third embodiment is the same as that of FIG. 7 of the first embodiment.
  • the instantaneous power detector 7 2 detects a divider instantaneous power IV 1A of V l [alpha] from the 6 2 (t) / W ( t) (t) / W (t) I 2 removal Output to calculator 7 '3.
  • the divider 73 outputs the instantaneous power detected by the instantaneous power detector 72 to the output of the multiplier 65 (V 1A (t) / W (t)) * V 1B (t). Force I v 1A (t) / w (t) i 2 and divide by (v 1A (t) /
  • the distortion detection circuit 1 can be controlled without depending on the magnitude of the signal component, so that the stability is improved.
  • the control circuit 52 By normalizing the residual distortion component, the distortion removal circuit 2 can be controlled without depending on the magnitude of the distortion component of the main amplifier 13. Stability is improved.
  • the divider 73 is connected to the output side of the multiplier 65, it may be connected to the output side of the multiplier 68.
  • the residual signal component and the residual distortion component calculated by the multiplier 65 are standardized, so that the input Since the control can be performed without depending on the magnitude of the signal component of the signal and the magnitude of the distortion component of the main amplifier 13, the effect of further improving the stability can be obtained.
  • FIG. 12 is a block diagram showing a configuration of a feedforward amplifier according to Embodiment 4 of the present invention.
  • 15 is a pilot signal oscillator
  • 16 is a directional coupler
  • the configuration is the same as the configuration shown in FIG. 7 of the first embodiment.
  • the pilot signal of a predetermined output level output from the oscillator 15 is distorted.
  • the signal is combined with the input signal by the directional coupler 16 of the detection circuit 1 and input to the power divider 11.
  • the frequency of this pilot signal is set outside the frequency band of the input signal.
  • the pilot signal is regarded as a signal component of the input signal, and the same processing as in the above embodiments is performed. That is, assuming that the pilot signal component is Vp, in each of the above embodiments, instead of the signal component Vs of the input signal, the desired wave component Vs + Vp by the signal component Vs and the pilot signal component Vp is used. Each process may be performed.
  • Embodiment 5 As described above, according to the fourth embodiment, the same effects as in the first to third embodiments can be obtained, and a pilot signal of a predetermined output level is input to the distortion detection circuit 1, and By controlling the distortion detection circuit 1 based on the signal component of the signal and the desired wave component of the pilot signal component, the effect of accurately performing the distortion detection operation is obtained.
  • Embodiment 5
  • FIG. 13 is a block diagram showing a configuration of a feedforward amplifier according to Embodiment 5 of the present invention.
  • reference numeral 17 denotes a pilot signal oscillator
  • 18 denotes a directional coupler
  • the configuration is the same as the configuration shown in FIG. 7 of the first embodiment.
  • the output signal of the predetermined output caliber output from the oscillator 17 is combined with the input signal by the directional coupler 18 of the distortion detection circuit 1, amplified by the main amplifier 13 and amplified by the power divider 20.
  • the frequency of the pilot signal is set outside the frequency band of the input signal, and the pilot signal is regarded as a distortion component generated from the main amplifier 13, and the pilot signals from the first to third embodiments are considered.
  • the same processing is performed. That is, assuming that the pilot signal component is Vp, in Embodiments 1 to 3 above, instead of the distortion component Vd, each processing may be performed as an unnecessary wave component Vd + Vp due to the distortion component Vd and the pilot signal component Vp.
  • the same effects as those of the first to third embodiments can be obtained, and a pilot signal having a predetermined output level is input to distortion detection circuit 1, and distortion is detected.
  • a pilot signal having a predetermined output level is input to distortion detection circuit 1, and distortion is detected.
  • the feedforward amplifier according to the present invention reliably converges the set value of the vector regulator even when the main amplifier and the auxiliary amplifier are nonlinear, so that the satellite communication, the terrestrial microwave communication, Suitable for body communication.

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

Abstract

Selon l'invention, un signal Vs (signal) + Vd (distorsion) dans un chemin de sortie (5) d'un amplificateur principal est combiné par un synthétiseur de puissance (27) avec un signal de sortie G(W) W Vd en provenance d'un amplificateur auxiliaire (26) et un signal d'erreur Ve (= Vs + (1 + G(W) W) Vd) est entré à partir d'un coupleur directionnel (33) dans un circuit de commande (39) servant de filtre adaptatif. Par ailleurs, le signal de sortie G(W) W Vd de l'amplificateur auxiliaire (26) est extrait à partir d'un coupleur directionnel (24) et il est divisé par un diviseur (38) par une valeur définie W émise par le circuit de commande (39), puis G(W) Vd est entré comme signal de référence du circuit de commande (39).
PCT/JP2001/006181 2001-04-20 2001-07-17 Amplificateur a correction aval WO2002087078A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-123327 2001-04-20
JP2001123327A JP3720276B2 (ja) 2001-04-20 2001-04-20 フィードフォワード増幅器

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WO2002087078A1 true WO2002087078A1 (fr) 2002-10-31

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WO (1) WO2002087078A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN100576767C (zh) * 2005-06-03 2009-12-30 株式会社Ntt都科摩 多频带用前馈放大器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0470203A (ja) * 1990-07-11 1992-03-05 Nippon Telegr & Teleph Corp <Ntt> フィードフォワード増幅器
JPH11355057A (ja) * 1998-06-11 1999-12-24 Fujitsu Ltd 歪み補償アンプの制御方法
JP2000031748A (ja) * 1998-04-01 2000-01-28 Lucent Technol Inc フィ―ドフォワ―ド線形化装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0470203A (ja) * 1990-07-11 1992-03-05 Nippon Telegr & Teleph Corp <Ntt> フィードフォワード増幅器
JP2000031748A (ja) * 1998-04-01 2000-01-28 Lucent Technol Inc フィ―ドフォワ―ド線形化装置
JPH11355057A (ja) * 1998-06-11 1999-12-24 Fujitsu Ltd 歪み補償アンプの制御方法

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JP3720276B2 (ja) 2005-11-24
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JP2002319829A (ja) 2002-10-31
CN1437794A (zh) 2003-08-20
KR20030014229A (ko) 2003-02-15

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