JP2002319829A - Feedforward amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely converge a setting value of a vector adjustment device even when a nonlinear amplifier is employed for an auxiliary amplifier. SOLUTION: A power combiner 27 combines a Vs (signal)+Vd (distortion) in a main amplifier output path 5 with an output G(W).W.Vd from the auxiliary amplifier 26, and a directional coupler 33 receiving an output of the combiner 27 gives an error signal Ve (=Vs+(1+G(W).W).Vd) to a control circuit 39 acting like an adaptive filter. A directional coupler 24 extracts the output G(W).W.Vd from the auxiliary amplifier 26, a divider 38 divides an output of the directional coupler 24 by a setting value W outputted from the control circuit 39 and the quotient G(W).Vd is given to the control circuit 39 as a reference signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feedforward amplifier used for satellite communication, terrestrial microwave communication, and mobile communication.

[0002]

2. Description of the Related Art FIG. 9 shows, for example, U.S. Pat. No. 4,394,62.
FIG. 5 is a block diagram illustrating a configuration of a conventional feedforward amplifier created with reference to the feedforward amplifier disclosed in Japanese Patent No. 4; In the figure, 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, and 6 is a distortion injection path. This feedforward amplifier basically has two loops and a circuit for controlling them. It consists of. The first loop, the distortion detection circuit 1, is composed of a main amplifier signal path 3 and a linear signal path 4, and the second loop, the distortion removal circuit 2, is composed of a main amplifier output path 5 and a distortion injection path 6. Have been.

In FIG. 9, reference numeral 11 denotes a power distributor,
12 is a vector adjuster, 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, 32 is an output terminal, 33 is a directional coupler, 35
Is a band rejection filter, 36 is a control circuit, and 37 is a control circuit.

FIG. 10 shows control circuits 36 and 37 in FIG.
FIG. 2 is a block diagram showing the internal configuration of
Is a complex conjugate, 42 is a multiplier, 43 is an integrator, 44 is a set value updater, 45 is a complex conjugate 41, a multiplier 4
2. A correlator constituted by the integrator 43.

Next, the operation will be described. First, the operation of the distortion detection circuit 1 will be described. 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 divider 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 0. 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 of the input signal extracted from the directional coupler 14 in the distortion detection circuit 1 (here, V
_1A (t)) is input to the control circuit 36. Also,
The distortion component including the residual signal component extracted from the directional coupler 23 in the distortion removal circuit 2 is (here, V _1B (t)
) Is input to the control circuit 36.

[0007] The control circuit 36 to seek a correlation between the 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) Based on the calculated residual signal component, the set value W (t) is changed 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 the phase of the input signal from the power divider 11 based on the set value W (t) from the control circuit 36, so that the power combiner 21
The residual signal component included in the distortion component output to the distortion injection path 6 from is reduced.

Next, the operation of the distortion removing circuit 2 will be described. 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, amplified by the auxiliary amplifier 26, and 27, the power is combined with the signal component including the distortion component output from the power divider 20 in the main amplifier output path 5. In the power combiner 27, a distortion component generated by the main amplifier 13 is reduced, and an output signal based on a signal component including a residual distortion component is output from the directional coupler 33.

The directional coupler 24 in the distortion removing circuit 2
Distortion components including residual signal components extracted from
The residual signal component is cut off by the filter 35 and the distortion component is
(Here, V_2A(T) is input to the control circuit 37.
Is done. Also, the output extracted from the directional coupler 33
A signal component including a residual distortion component that is a signal (here, V _2B
(T) is input to the control circuit 37.

[0011] The control circuit 37 is the correlation between the 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) Then, based on the calculated 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 V _2B (t) output from the power combiner 27 is minimized. Output to

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) from the control circuit 37, and thereby the power combiner 27 To reduce the residual distortion component included in the signal component output from.

As described above, the control of the distortion extracting circuit 1 and the control of the distortion removing circuit 2 are executed constantly or intermittently, and the set values W (t) output from the control circuits 36 and 37 are output.
Is repeated, thereby removing a distortion component generated from the main amplifier 13 and realizing a feedforward amplifier with good linearity.

Next, the operation of the control circuit 36 shown in FIG. 10 will be described. The signal component V _1A (t) of the input signal extracted from the directional coupler 14 in FIG. The complex conjugate unit 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
Complex conjugate V _1A of _1A ^(t) (t) ^* is output to the multiplier 42.

The multiplier 42 converts the complex conjugate V _1A (t) ^* from the complex conjugate unit 41 and the distortion component V _1B (t) including the residual signal component extracted from the directional coupler 23 in FIG. The multiplication result is calculated by calculating the multiplication result V _1A (t) ^* · V _1B (t), and the integrator 43 calculates the time average of the multiplication result V _1A (t) ^* · V _1B (t). Average value <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
Based on the average value of the multiplication result <V _1A (t) ^* · V _1B (t)>, the set value W (t) given to the vector adjuster 12 is updated.

Next, the operation of the control circuit 37 shown in FIG. 10 will be described. The distortion component V _2A (t) extracted from the directional coupler 24 of FIG. 9 via the band rejection filter 35 is input to the complex conjugate unit 41. The complex conjugate unit 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 converts the complex conjugate V _{2A of the} distortion component V _2A (t). (T) 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. The product is multiplied to calculate a multiplication result V _2A (t) ^* · V _2B (t), and a time average of the multiplication result V _2A (t) ^* · V _2B (t) is calculated by the integrator 43. Average value <V
_2A (t) ^*. _V2B (t)> is output as a residual distortion component included in the signal component _V2B (t). The set value updater 44
The set value W (t) given to the vector adjuster 25 is updated based on the average <V _2A (t) ^* · V _2B (t)> of the multiplication result.

FIG. 11 is a graph showing the convergence characteristics of the set value W (t) output from the control circuits 36 and 37.
(T) is repeatedly updated from the initial value Wo and the convergence value Wm
FIG. As shown in FIG. 11A, although it takes time for the convergence characteristic 101 to converge to the convergence value Wm, each set value W (t) is stable. In the convergence characteristic 102, the time required for convergence to the convergence value Wm is fast, but each set value W (t) is greatly changed and stability is reduced. Further, when the stability decreases, FIG.
As shown in the convergence characteristic 103 of (b), the set value W (t)
May diverge without converging to the convergence value Wm.

Such a distortion extracting circuit 1 and a distortion removing circuit 2
In the control process, it is important to ensure convergence and stability of the control. Control circuits 36 and 37 shown in FIG.
Calculates the set value W (t) of the vector adjusters 12 and 25 by a so-called adaptive filter algorithm. The following describes the adaptive filter algorithm and the set value W
The convergence of (t) will be described.

FIG. 12 is a diagram showing the operation principle of the distortion removing circuit 2. In the figure, Vs is a signal component of the input signal,
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, and W is the vector adjuster 2.
The set value Ve given to 5, which is a signal component including a residual distortion component from the directional coupler 33, is an error signal of the control circuit 37 (adaptive filter). In this figure, the residual signal component output to the distortion injection path 6 is set to 0 for simplification.

As shown in FIG. 12, the main amplifier output path 5
Are combined with the output G.W.Vd from the auxiliary amplifier 26 by the power combiner 27, and the error signal Ve shown in the following equation (1) is input from the directional coupler 33 to the control circuit 37. Ve = Vs + (1 + GW) Vd (1) Further, the reference signal Vd from the directional coupler 24 is input to the control circuit 37.

Here, it is considered that the power of the error signal Ve is minimized in order to minimize the error signal Ve, and the error signal power Pe of the error signal Ve is expressed by the following equation (2). Pe (W) = <| Ve | ² > = <| Ve ^* · Ve |> = <| Vs | ² > + | 1 + GW · ² <| Vd | ² > (2) where the above equation (2) is satisfied. Since Vs and Vd are uncorrelated, <Vs ^* · Vd> = 0 (3).

Generally, assuming that 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 given by the following equation (4).
It is shown by the formula. W (t + 1) = W (t) -μ∂Pe (W) / ∂W (t) (4) In the above equation (4), μ is a correction coefficient and ∂Pe (W) /
∂W (n) is the error signal power Pe (W) set value W (n)
And the gradient in the function of the error signal power Pe (W).

FIG. 13 is a diagram showing a function of the error signal power Pe (W), where Re [W] is the real axis of the set value W, Im [W] is the imaginary axis of the set value W, and 111 is The slope 112 in the function of the error signal power Pe (W) is the minimum point of the error signal power Pe (W). The adaptive filter algorithm obtains a slope (amount of change) 111 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 111 to be minimum, that is, the error signal power Pe (W). ) Is obtained. Here, the slope of the error signal power Pe (W) includes an amplitude component and a phase component.

By substituting the above equation (2) into the above equation (4), the following equation (5) is obtained. W (t + 1) = W (t) −2 μ · G ^* · Vd ^* · Ve (5) In the above equation (5), the control circuit 37 supplies Vd as a reference signal.
When Ve is input as an error signal, 2 μ ·
When G ^* is set to a value smaller than a predetermined threshold, the set value W
(T + 1) means convergence. In the linear auxiliary amplifier 26, when 2 μ · G ^* in the above equation (5) is set to a value smaller than a predetermined threshold, the set value W (t + 1)
Converges.

In the above equation (5), the auxiliary amplifier 26G
Is assumed to be linear, but in the non-linear auxiliary amplifier 26, the passing gain and the passing phase change according to the set value W, so that G (W) is obtained, and the set value W (t + 1) at the update count t + 1 is It is shown by equation (6). W (t + 1) = W (t) −2 μ · G ^* (W) · Vd ^* · Ve (6)

In the above equation (6), when Vd is input to the control circuit 37 as a reference signal and Ve is input as an error signal, the distortion removing circuit 2 using the nonlinear auxiliary amplifier 26 is used.
At the setting value W (t +
In order to converge 1), it is necessary to set 2 μ · G ^* (W) to a value smaller than a predetermined threshold. However, G (W)
Changes with time, it is not realistic to preset 2 μ · G ^* (W) having various values.

FIG. 12 illustrates the distortion removal circuit 2, but the same applies to the main amplifier 13 of the distortion detection circuit 1. In the case of the non-linear main amplifier 13, the set value W (t +
In order to converge 1), it is necessary to set 2 μ · G ^* (W) to a value smaller than a predetermined threshold value. Again, it is a reality to preset 2 μ · G ^* (W) having various values. Not a target.

[0029]

Since the conventional feedforward amplifier is configured as described above, in controlling the distortion detection circuit 1 and the distortion removal circuit 2, the main amplifier 1
3 and the auxiliary amplifier 26 are non-linear, the convergence of the set value W of the vector adjusters 12 and 25 is deteriorated.

The present invention has been made to solve the above-described problem. In controlling the distortion detecting circuit 1 and the distortion removing circuit 2, even if the main amplifier 13 and the auxiliary amplifier 26 are non-linear, the vector adjuster is used. It is an object of the present invention to obtain a feedforward amplifier capable of reliably converging the set values W of 12, 25.

[0031]

A feedforward amplifier according to the present invention divides a signal component extracted from an output of a main amplifier by a set value of a vector adjuster, and a result of the division and a residual detected by a distortion detection circuit. A control circuit is provided for calculating a residual signal component included in the distortion component based on the distortion component including the signal component, and controlling a next set value of the vector adjuster.

In the feedforward amplifier according to the present invention, the distortion component extracted from the output of the auxiliary amplifier is divided by the set value of the vector adjuster, and the division result and the signal component including the residual distortion component output from the distortion removing circuit are divided. And a control circuit that calculates the residual distortion component included in the signal component based on the control signal and controls the next set value of the vector adjuster.

The feedforward amplifier according to the present invention divides a desired wave component obtained by synthesizing an input signal extracted from an output of the main amplifier and a pilot signal by a set value of a vector adjuster, and detects a result of the division and a distortion detection circuit. And a control circuit for calculating a residual desired wave component included in the distortion component based on the obtained distortion component including the residual desired wave component and controlling a next set value of the vector adjuster.

The feedforward amplifier according to the present invention divides an unnecessary wave component due to a main amplifier distortion component and a pilot signal component extracted from the output of the auxiliary amplifier by a set value of a vector adjuster, and the result of the division and a distortion removal circuit. And a control circuit that calculates a residual unnecessary wave component included in the signal component based on the signal component including the residual unnecessary wave component output from the controller and controls the next set value of the vector adjuster.

The feedforward amplifier according to the present invention inputs a signal component extracted from the output of the main amplifier and a distortion component including a residual signal component detected by the distortion detection circuit, digitizes the input signal component, and Digitizing the distortion component including the residual signal component, dividing the digitized signal component by a digitized set value for providing to the vector adjuster, and dividing the result of the division by the digitized residual signal component. The residual signal component included in the distortion component is calculated by calculating the correlation with the distortion component included,
The calculated residual signal component is multiplied by a correction coefficient in consideration of the convergence and stability of the control of the distortion detection circuit, and the digitized set value to be provided to the vector adjuster is updated. It is provided with a control circuit which is converted into an analog signal and supplied to the vector adjuster.

[0036] In the feedforward amplifier according to the present invention, the control circuit multiplies the complex conjugate of the division result by a distortion component including a digitized residual signal component, and time-averages the multiplication result to include the result in the distortion component. The remaining signal component to be calculated is calculated.

The feedforward amplifier according to the present invention inputs a signal component extracted from the output of the main amplifier and a distortion component including a residual signal component detected by the distortion detection circuit, digitizes the input signal component, and Digitizing the distortion component including the residual signal component, dividing the digitized signal component by a digitized set value for providing to the vector adjuster, and obtaining a complex conjugate of the division result and the digitized residual. By multiplying by a distortion component including a signal component, a residual signal component included in the distortion component is calculated, and the calculated residual signal component is multiplied by a correction coefficient in consideration of convergence and stability of control of the distortion detection circuit. , A control circuit for updating the digitized set value to be given to the vector adjuster, converting the updated set value into an analog signal, and giving the analog value to the vector adjuster. Those were example.

In the feedforward amplifier according to the present invention, the control circuit multiplies the complex conjugate of the division result by the distortion component including the digitized residual signal component, and specifies the multiplication result by the instantaneous power of the division result. That is, the residual signal component included in the distortion component is calculated.

The feedforward amplifier according to the present invention inputs a distortion component extracted from the output of the auxiliary amplifier and a signal component including a residual distortion component output from the distortion removal circuit, digitizes the input distortion component, and Digitizing the signal component including the residual distortion component, dividing the digitized distortion component by a digitized set value for providing to the vector adjuster, and dividing the result of the division by the digitized residual distortion component. Calculate the residual distortion component included in the signal component by calculating the correlation with the included signal component, and multiply the calculated residual distortion component by a correction coefficient considering the convergence and stability of the control of the distortion removal circuit to adjust the vector. A control circuit for updating a digitized set value to be given to the vector adjuster, converting the updated set value into an analog signal, and giving the analog value to the vector adjuster. That.

In the feedforward amplifier according to the present invention, the control circuit multiplies the complex conjugate of the division result by the signal component including the digitized residual distortion component, and time-averages the multiplication result to include the result in the signal component. This is for calculating the residual strain component to be calculated.

The feedforward amplifier according to the present invention inputs a distortion component extracted from the output of the auxiliary amplifier and a signal component including a residual distortion component output from the distortion removal circuit, digitizes the input distortion component, and Digitizing the signal component including the residual distortion component, dividing the digitized distortion component by a digitized set value for providing to the vector adjuster, and calculating the complex conjugate of the division result and the digitized residual. By multiplying by the signal component including the distortion component, the residual distortion component included in the signal component is calculated, and the calculated residual distortion component is multiplied by a correction coefficient in consideration of the convergence and stability of the control of the distortion removal circuit. And a control circuit for updating the digitized set value to be provided to the vector adjuster, converting the updated set value into an analog signal, and providing the analog value to the vector adjuster. It is.

In the feedforward amplifier according to the present invention, the control circuit multiplies the complex conjugate of the division result by the signal component including the digitized residual distortion component, and specifies the multiplication result by the instantaneous power of the division result. That is, the residual distortion component included in the signal component is calculated.

The feedforward amplifier according to the present invention inputs a desired wave component obtained by combining an input signal extracted from the output of the main amplifier and a pilot signal and a distortion component including a residual desired wave component detected by a distortion detection circuit. Digitizing the input desired wave component, digitizing the distortion component including the input residual desired wave component, and dividing the digitized desired wave component by a digitized set value for providing to the vector adjuster. Calculating the correlation between the result of the division and the digitized distortion component including the residual desired wave component, calculating the residual desired wave component included in the distortion component, and converging the control of the distortion detection circuit to the calculated residual desired wave component. Multiplied by a correction factor that takes into account performance and stability, updates the digitized set value to be given to the vector adjuster, and analyzes the updated set value. And grayed of those having a control circuit for applying to the vector adjuster.

In the feedforward amplifier according to the present invention, 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 to obtain the distortion component. This is for calculating the residual desired wave component included.

The feedforward amplifier according to the present invention inputs a desired wave component obtained by combining an input signal extracted from the output of the main amplifier and a pilot signal, and a distortion component including a residual desired wave component detected by a distortion detection circuit. Digitizing the input desired wave component, digitizing the distortion component including the input residual desired wave component, and dividing the digitized desired wave component by a digitized set value for providing to the vector adjuster. Multiplying the complex conjugate of the result of the division by the distortion component including the digitized residual desired wave component to calculate a residual desired wave component included in the distortion component; Multiplied by the correction factor considering the convergence and stability of the control, update the digitized setting value to be given to the vector adjuster, and update the updated setting The in analog form are those having a control circuit for applying to the vector adjuster.

In the feedforward amplifier according to the present invention, 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. That is to calculate the residual desired wave component included in the distortion component.

The feedforward amplifier according to the present invention includes a main amplifier distorted component extracted from the output of the auxiliary amplifier, an unnecessary wave component due to a pilot signal component, and a signal component including a residual unnecessary wave component output from the distortion removing circuit. Input, digitize the unnecessary wave component input, digitize the signal component including the residual unnecessary wave component input, and digitize the unnecessary wave component with a digitized set value for providing the digitized unnecessary wave component to the vector adjuster. Divide,
A correlation between the result of the division and the digitized signal component including the unnecessary unnecessary wave component is calculated to calculate a residual unnecessary wave component included in the signal component, and the calculated residual unnecessary wave component is converged by the control of the distortion removing circuit. And a control circuit that updates the digitized set value to be given to the vector adjuster by multiplying the corrected set value in consideration of the stability and converts the updated set value into an analog signal and gives it to the vector adjuster. is there.

In the feedforward amplifier according to the present invention, 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 obtain a signal component. The residual unnecessary wave component included is calculated.

The feedforward amplifier according to the present invention includes a main amplifier distorted component extracted from an output of an auxiliary amplifier, an unnecessary wave component due to a pilot signal component, and a signal component including a residual unnecessary wave component output from a distortion removing circuit. Input, digitize the unnecessary wave component input, digitize the signal component including the residual unnecessary wave component input, and digitize the unnecessary wave component with a digitized set value for providing the digitized unnecessary wave component to the vector adjuster. Divide,
The complex conjugate of the division result is multiplied by a digitized signal component including a residual unnecessary wave component to calculate a residual unnecessary wave component included in the signal component, and the calculated residual unnecessary wave component is controlled by a distortion removing circuit. A control circuit is provided which multiplies a correction coefficient in consideration of convergence and stability of, updates a digitized set value to be given to the vector adjuster, converts the updated set value into an analog signal, and gives the updated set value to the vector adjuster. It is a thing.

In the feedforward amplifier according to the present invention, the control circuit multiplies the complex conjugate of the division result by the signal component containing the digitized residual unnecessary wave component, and specifies the multiplication result by the instantaneous power of the division result. That is, the residual unnecessary wave component included in the signal component is calculated.

[0051]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a diagram showing an operation principle of a distortion removal circuit 2 of a feedforward amplifier according to a first embodiment of the present invention. In FIG. 1, reference numeral 38 denotes a divider, 39 denotes a control circuit as an adaptive filter, and G (W) denotes The pass gain and pass phase of the auxiliary amplifier 26, and other Vs, Vd,
W and Ve are the same as those shown in FIG. Here, it is assumed that the auxiliary amplifier 26 is a non-linear amplifier.

As shown in FIG. 1, Vs + Vd in the main amplifier output path 5 is combined with the output G (W) · W · Vd from the auxiliary amplifier 26 by the power combiner 27, An error signal Ve shown in the following equation (7) is input to 39. Ve = Vs + (1 + G (W) · W) · Vd (7) Also, the output G (W) · W · Vd from the directional coupler 24
Is divided by the divider 38 by the set value W output from the control circuit 39, and G (W) · Vd is input as a reference signal of the control circuit 39.

Here, the error signal power Pe of the error signal Ve
Is expressed by the following equation (8). Pe (W) = <| Ve | ² > = <| Ve ^* · Ve |> = <| Vs | ² > + | 1 + G (W) · W | ² <| Vd | ² > (8) where (8) Since Vs and Vd are uncorrelated also in the expression (3), the above expression (3) is used as a condition.

By substituting the above equation (8) into the above equation (4), W (t + 1) = W (t) −2 μ · G ^* (W) · Vd ^* · Ve = W (t) −2 μ · (G (W) · Vd) ^* · Ve (9) However, in the above equation (9), assuming that the change in the pass gain and the pass phase is small, ∂G (W) / ∂W ≒ 0, ∂G ^* (W) / ∂W ≒ 0 (10).

The above equation (9) is the same as the above equation (6), except that when the reference signal of the control circuit 39 is G (W) · Vd and the error signal is Ve, the passing gain of the auxiliary amplifier 26 is Even if the passing phase G (W) changes with time and the function of the error signal power Pe in the above equation (8) changes, the minimum of the function of the changed error signal power Pe from the slope 111 shown in FIG. This means that the point 112 should be obtained. That is, instead of the reference signal Vd of the control circuit 37 shown in FIG.
Vd means that it is sufficient. Then, in order to set the reference signal of the control circuit 39 to G (W) · Vd, as shown in FIG. 1, the output G (W) · W · Vd of the auxiliary amplifier 26 is extracted from the directional coupler 24, and What is necessary is just to divide by the output W of the control circuit 39 by the divider 38.

FIG. 1 is a diagram showing the operation principle of the distortion removing circuit 2. The same applies to the distortion detecting circuit 1. The output G (W) .W.Vs of the main amplifier 13 is extracted and divided by a divider. The circuit configuration may be such that the reference signal of the control circuit as an adaptive filter is set to G (W) · Vs by dividing by the output W of the control circuit.

FIG. 2 is a block diagram showing a configuration of the feedforward amplifier according to the first embodiment of the present invention.
In the figure, reference numeral 22 denotes a directional coupler, reference numerals 34 and 35 denote band-stop filters, reference numerals 51 and 52 denote control circuits, and other configurations include a directional coupler 24 in the distortion removing circuit 2 and an output side of the auxiliary amplifier 26. The configuration is the same as that of the conventional configuration shown in FIG.

FIG. 3 is a block diagram showing the internal configuration of the control circuits 51 and 53. In the figure, 61 is an AD converter, 62 is a divider, 63 is a complex conjugate, 64 is an AD converter, and 65 is an AD converter. Is a multiplier, 66 is an integrator, 67 is a correction coefficient setter, 68 is a multiplier, 69 is a set value updater, and 70 is DA
A converter 71 is a correlator composed of the complex conjugate 63, the multiplier 65, and the integrator 66.

Next, the operation will be described. First, the operation of the distortion detection circuit 1 will be described. In FIG. 2, the signal component including the distortion component output from the main amplifier 13 is distributed in power by the power distributor 20, extracted by the directional coupler 22, and the distortion component is cut off by the band cut filter 34. A signal component (here, V _1A (t)) is input to the control circuit 51. As in the conventional case, a distortion component (here, V _1B (t)) including a residual signal component extracted from the directional coupler 23 is input to the control circuit 51.

The control circuit 51 receives the signal component V _1A (t) and the distortion component V _1B (t) including the residual signal component, and
_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 calculated based on the calculated residual signal component. The set value W (t) is output to the vector adjuster 12 so as to be 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, and
The residual signal component included in the distortion component output to the distortion injection path 6 from is reduced.

Next, the operation of the control circuit 51 shown in FIG. 3 will be described. The signal component V _1A (t) extracted from the directional coupler 22 in FIG.
The digital signal is converted by the AD converter 61 in FIG. 3 and is divided by the set value W (t) output from the set value updater 69 by the divider 62 to obtain V _1A (t) / W (t) as a complex conjugate. Input to the device 63. The complex conjugator 63 outputs the signal component V
Amplitude of _1A (t) / W (t) (real part of complex number)
, The phase (the imaginary part of the complex number) is inverted and the complex conjugate of V _1A (t) / W (t) (V _1A (t) /
W (t)) ^* 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 component V including a residual signal component converted into a digital signal by the AD converter 64. _1B (t) and the result of multiplication (V _1A (t) / W
_{^{(T)) * · V 1B}} ( calculates t), an integrator 66 multiplication result (V _1A (t) by obtaining the time average of ^{/ W (t)) * ·} V 1B (t), the multiplication result Average value <(V
_1A (t) / W (t)) ^* · V _1B (t)>
_It is output as a residual signal component included in _1B (t). Multiplication result (V _1A (t) / W (t)) by this integrator 66 ^*
By calculating the time average of V _1B (t), the distortion detection circuit 1
Can improve the stability of the control system.

The correction coefficient setting unit 67 takes into consideration the convergence and stability of the control of the distortion detection circuit 1 according to the pass characteristics of the main amplifier 13, that is, according to the pass gain and pass phase of the main amplifier 13. The modified correction coefficient μ is set in advance. Here, for example, the product A of the correction coefficient μ and the passing gain α (= μ ×
α) determines the convergence and stability of the control. When the product A is large, the convergence speed is increased and the convergence is improved, but the stability is deteriorated. When the product A is small, the convergence speed is decreased and the convergence is reduced, but the stability is improved.

FIG. 4 shows the set value W output from the control circuit 51.
It is a figure which shows the convergence characteristic of (t), and shows the case where the set value W (t) of the control circuit 51 when the correction coefficient μ is used as a parameter is repeatedly updated. Here, the passing gain α
Is constant. As shown in FIG. 4A, when the correction coefficient μ 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.
As shown in (b) and (c), as the correction coefficient μ decreases, the convergence speed decreases and the convergence decreases, but the stability improves. Therefore, the product A may be determined in consideration of the convergence and stability of the control, and the correction coefficient μ according to the passing gain α of the main amplifier 13 may be set.

Multiplier 68 has a residual signal component output from integrator 66 <(V _1A (t) / W (t)) ^* · V _1B (t)
> Indicates the correction coefficient μ set in the correction coefficient setting unit 67.
And a set value change amount ΔW which is a 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). Output to the updater 69. ΔW = μ · <(V _1A (t) / W (t)) ^* · V _1B (t)> (11)

The set value updater 69 adds the set value change amount ΔW obtained by the multiplier 68 to the set value W (t) of the vector adjuster 12 at the update count t, and calculates the number of updates t +
1 is obtained by the following equation (12) as the set value W (t + 1). W (t + 1) = W (t) + ΔW = W (t) + μ · <(V _1A (t) / W (t)) ^* · V _1B (t)> (12) That is, the setting value updating unit 69 sets The set value W (t + 1) is output to the DA converter 70 so that the value change amount ΔW is minimized.

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.

Next, the operation of the distortion removal circuit 2 will be described. 2, the distortion component including the residual signal component output from the auxiliary amplifier 26 is extracted by the directional coupler 24, the residual signal component is blocked by the band rejection filter 35, and the distortion component (here, V _2A (T) is input to the control circuit 52. As in the related art, 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 52 receives the distortion component V _2A (t) and the signal component V _2B (t) including the residual distortion component, and
_The residual distortion component included in _2B (t) is calculated, and based on the calculated residual distortion component, the residual distortion component included in the signal component V _2B (t) output from the power combiner 27 is minimized. , W (t) to the vector adjuster 25.

The vector adjuster 25 adjusts the amplitude and phase of the distortion component including the residual signal component from the directional coupler 23 on the basis of the set value W (t) from the control circuit 52, so that the power combiner 27 To reduce the residual distortion component included in the signal component output from.

Next, the operation of control circuit 52 shown in FIG. 3 will be described. The distortion component V _2A (t) extracted from the directional coupler 24 in FIG. 2 and passed through the band rejection filter 35 is converted into a digital signal by the AD converter 61 in FIG. Output set value W
Divided by (t), V _2A (t) / W (t) is input to the complex conjugate 63. The complex conjugate unit 63 calculates the distortion component V
_2A (t) / W (t) amplitude (real part of complex number)
, The phase (the imaginary part of the complex number) is inverted, and the complex conjugate of V _2A (t) / W (t) (V _2A (t) /
W (t)) ^* 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. _2B (t) and the multiplication result (V _2A (t) / W
_{^{(T)) * · V 2B}} ( calculates t), an integrator 66 multiplication result (V _2A (t) by obtaining the time average of ^{/ W (t)) * ·} V 2B (t), the multiplication result Average value <(V
_2A (t) / W (t)) ^* · V _2B (t)> is converted to the signal component V _2B
It is output as a residual distortion component included in (t). Multiplication result (V _2A (t) / W (t)) by this integrator 66 ^* · V
_{By obtaining} the time average of _2B (t), the stability of the control system of the distortion removal circuit 2 can be improved.

The correction coefficient setting device 67 includes the auxiliary amplifier 26
The correction coefficient μ in consideration of the convergence and stability of the control of the distortion removing circuit 2 is set in advance in accordance with the pass characteristic of the auxiliary amplifier 26, that is, in accordance with the pass gain and the pass phase of the auxiliary amplifier 26.

The multiplier 68 outputs the residual distortion component output from the integrator 66 <(V _2A (t) / W (t)) ^* · V _2B (t)>
Is multiplied by the correction coefficient μ set in the correction coefficient setting unit 67, and the set value change amount which is the multiplication result in consideration of the convergence and stability of the control of the distortion removal circuit 2 according to the pass characteristic of the auxiliary amplifier 26. ΔW is calculated by the following equation (13) and output to the set value updating unit 69. ΔW = μ · <(V _2A (t) / W (t)) ^* · V _2B (t)> (13)

The set value updater 69 adds the set value change amount ΔW obtained by the multiplier 68 to the set value W (t) at the number of updates t of the vector adjuster 25, and calculates the number of updates t +
1 is obtained by the following equation (14) as the set value W (t + 1). W (t + 1) = W (t) + ΔW = W (t) + μ · <(V _2A (t) / W (t)) ^* · V _2B (t)> (14) That is, the set value updating unit 69 sets The set value W (t + 1) is output to the DA converter 70 so that the value change amount ΔW is minimized.

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.

As described above, according to the first embodiment, the control circuit 51 digitizes the signal component V _1A (t) extracted from the output of the main amplifier 13, and updates the number of times t Is divided by the set value W (t), and the distortion component V _1B (t) including the residual signal component extracted from the output of the power combiner 21 is digitized, and the correlation with the division result is obtained to obtain the distortion component V _1B ( t) is calculated by multiplying by a correction coefficient μ considering the convergence and stability of the control of the distortion detection circuit 1 to update the set value W (t). Is nonlinear, it is possible to obtain an effect that the set value W of the vector adjuster 12 output from the control circuit 51 can be surely converged.

Further, according to the first embodiment, the control circuit 52 digitizes the distortion component V _2A (t) extracted from the output of the auxiliary amplifier 26 and sets the digitized distortion component V _2A (t) at the number of updates t of the vector adjuster 25. 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 W (t), and the correlation with the division result is obtained to obtain the signal component V _2B (t). The auxiliary amplifier 26 calculates the residual distortion component to be included, multiplies it by a correction coefficient μ in consideration of the convergence and stability of the control of the distortion removal circuit 2 and updates the set value W (t). Even if the control circuit 5
2 has an effect that the set value W of the vector adjuster 25 output from the second controller 2 can be surely converged.

Embodiment 2 FIG. 5 shows a control circuit 51 of a feedforward amplifier according to a second embodiment of the present invention.
FIG. 52 is a block diagram showing a configuration of a second embodiment, in which an integrator 66 is removed from FIG. 3 of the first embodiment. The overall configuration of the feedforward amplifier according to the second embodiment is the same as the configuration of the first embodiment shown in FIG.

Next, the operation will be described. Control circuit 51
, The multiplier 65 receives the complex conjugate (V _1A (t) / W (t)) from the complex conjugate unit 63 as in the first embodiment ^.
Is multiplied by a distortion component V _1B (t) including a residual signal component converted into a digital signal by the AD converter 64, and a multiplication result (V _1A (t) / W (t)) ^* · V _1B (t ) Is calculated, and the multiplication result (V _1A (t) / W (t)) ^* · V _1B (t)
Is output as a residual signal component included in the distortion component V _1B (t).

Multiplier 68 is a residual signal component output from multiplier 65 (V _1A (t) / W (t)) ^* · V _1B (t)
Is multiplied by the correction coefficient μ set in the correction coefficient setting unit 67, and 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 characteristics of the main amplifier 13. ΔW is obtained by the following equation (15) and output to the set value updating unit 69. ΔW = μ · (V _1A (t) / W (t)) ^* · V _1B (t) (15)

The set value updater 69 adds the set value change amount ΔW obtained by the multiplier 68 to the set value W (t) of the vector adjuster 12 at the update count t, and calculates the update count t +
The set value W (t + 1) at 1 is obtained by the following equation (16). W (t + 1) = W (t) + ΔW = W (t) + μ · (V _1A (t) / W (t)) ^* · V _1B (t) (16) That is, the set value updater 69 changes the set value. The set value W (t + 1) is output to the DA converter 70 so that the amount ΔW is minimized.

As described above, the output of the multiplier 65 is obtained by calculating the time average by the integrator 66 as in the first embodiment.
By directly outputting to the multiplier 68, the amount of calculation in the control circuit 51 can be reduced and the processing speed can be increased. The same applies to the control circuit 52. The amount of calculation in the control circuit 52 can be reduced and the processing speed can be increased.

As described above, according to the second embodiment, the output of multiplier 65 is directly output to multiplier 68 without calculating the time average by integrator 66 as in the first embodiment. Accordingly, by increasing the processing speed by reducing the amount of calculation in the control circuits 51 and 52, it is possible to obtain an effect that the response of the control system of the distortion detection circuit 1 and the distortion removal circuit 2 can be accelerated.

Embodiment 3 FIG. 6 shows a control circuit 51 of a feedforward amplifier according to a third embodiment of the present invention.
It is a block diagram which shows the structure of 52. In the figure, 72
Is an instantaneous power detector, 73 is a divider, and the other configuration is the same as the configuration in FIG. The overall configuration of the feedforward amplifier according to the third embodiment is the same as that of the first embodiment shown in FIG.

Next, the operation will be described. Control circuit 51
, The instantaneous power detector 72 detects the V
_1A (t) / W instantaneous power of the _{(t) | V 1A (t} ) / W (t)
| ² is detected and output to the divider 73. The divider 73 outputs the output of the multiplier 65 (V _1A (t) / W (t)) ^* · V _1B
(T) is determined by the instantaneous power | V detected by the instantaneous power detector 72.
_1A (t) / W (t) | ² , and the result of the division (V
_1A (t) / W (t)) ^* .V _1B (t) / | V _1A (t) /
W (t) | ² is output to the multiplier 68. Other operations are the same as in the second embodiment.

Thus, the output from the multiplier 65 (V _1A
(T) / W (t)) ^* · V _1B (t) is divided by the instantaneous power | V _1A (t) / W (t) | ² detected by the instantaneous power detector 72 to obtain (V _1A (T) / W (t)) ^* · V
_The residual signal component included in _1B (t) is standardized, and the distortion detection circuit 1 can be controlled without depending on the magnitude of the signal component, so that the stability is improved. The same applies to the control circuit 52. By normalizing the residual distortion component, the control of the distortion removal circuit 2 can be performed without depending on the magnitude of the distortion component of the main amplifier 13, so that the stability is improved. Is improved.

Although the divider 73 is connected to the output side of the multiplier 65 in the third embodiment, it may be connected to the output side of the multiplier 68.

As described above, according to the third embodiment, in the control of the distortion detecting circuit 1 and the distortion removing circuit 2, the residual signal component and the residual distortion component calculated by the multiplier 65 are normalized. Since the control can be performed without depending on the magnitude of the signal component of the input signal and the magnitude of the distortion component of the main amplifier 13, an effect that the stability can be further improved can be obtained.

Embodiment 4 FIG. 7 is a block diagram showing a configuration of a feedforward amplifier according to Embodiment 4 of the present invention. In FIG. 7, reference numeral 15 denotes a pilot signal oscillator, 16 denotes a directional coupler, and other configurations are the same as those of the embodiment. 1 is equivalent to the configuration shown in FIG.

Next, the operation will be described. The pilot signal of a predetermined output level output from the oscillator 15 is combined with the input signal by the directional coupler 16 of the distortion 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 same processing as in the above embodiments is performed by regarding the pilot signal as a signal component of the input signal. 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 signal component Vs
Desired wave component Vs + Vp based on the signal and pilot signal component Vp
Each process may be performed.

As described above, according to the fourth embodiment, 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 detecting circuit 1. By controlling the distortion detection circuit 1 based on a signal component of an input signal and a desired wave component of a pilot signal component, an effect is obtained that a distortion detection operation can be accurately performed.

Embodiment 5 FIG. 8 is a block diagram showing a configuration of a feedforward amplifier according to Embodiment 5 of the present invention. In the figure, reference numeral 17 denotes a pilot signal oscillator, reference numeral 18 denotes a directional coupler, and other configurations are the same as those of the embodiment. 1 is equivalent to the configuration shown in FIG.

Next, the operation will be described. A pilot signal having a predetermined output level output from the oscillator 17 is combined with an input signal by the directional coupler 18 of the distortion detection circuit 1, amplified by the main amplifier 13, and input to 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 same processing as in the first to third embodiments is performed. Do. That is, assuming that the pilot signal component is Vp, in the first to third embodiments, each process may be performed as an unnecessary wave component Vd + Vp by the distortion component Vd and the pilot signal component Vp instead of the distortion component Vd. .

As described above, according to the fifth embodiment, 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 detecting circuit 1. By controlling the distortion elimination circuit 2 using the unnecessary wave component caused by the distortion component and the pilot signal component, the effect that the distortion elimination operation can be performed accurately can be obtained.

[0097]

As described above, according to the present invention, the signal component extracted from the output of the main amplifier is divided by the set value of the vector adjuster, and the result of the division is combined with the residual signal component detected by the distortion detection circuit. The control circuit calculates the residual signal component included in the distortion component based on the distortion component including the control signal and controls the next set value of the vector adjuster, so that the control circuit outputs even when the main amplifier is nonlinear. There is an effect that the set value of the vector adjuster can be surely converged.

According to the present invention, the distortion component extracted from the output of the auxiliary amplifier is divided by the set value of the vector adjuster, and a signal based on the division result and the signal component including the residual distortion component output from the distortion removal circuit is obtained. By providing a control circuit that calculates the residual distortion component included in the component and controls the next set value of the vector adjuster, even if the auxiliary amplifier is nonlinear, the control circuit outputs the set value of the vector adjuster. There is an effect that convergence can be ensured.

According to the present invention, the desired signal component obtained by combining the input signal extracted from the output of the main amplifier and the pilot signal is divided by the set value of the vector adjuster, and the result of the division and the residual signal detected by the distortion detecting circuit are obtained. Even if the main amplifier is non-linear, the control circuit that calculates the residual desired wave component included in the distortion component based on the distortion component including the desired wave component and controls the next set value of the vector adjuster is provided. There is an effect that the set value of the vector adjuster output from the circuit can be surely converged and the distortion detection operation can be accurately performed.

According to the present invention, 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 adjuster.
A control circuit that calculates a residual unnecessary wave component included in the signal component based on the division result and the signal component including the residual unnecessary wave component output from the distortion removing circuit, and controls a next set value of the vector adjuster; Thus, even when the auxiliary amplifier is non-linear, the set value of the vector adjuster output from the control circuit can be reliably converged, and the distortion detection operation can be performed accurately.

According to the present invention, the signal component extracted from the output of the main amplifier and the distortion component including the residual signal component detected by the distortion detection circuit are input, the input signal component is digitized, and the input residual signal is input. In addition to digitizing the distortion component including the component, the digital signal component is divided by a digitized set value to be supplied to the vector adjuster, and the result of the division is divided by the distortion component including the digitized residual signal component. The residual signal component included in the distortion component is calculated by calculating the correlation with the correction coefficient, and the calculated residual signal component is multiplied by a correction coefficient in consideration of the convergence and stability of the control of the distortion detection circuit, and given to the vector adjuster. Is provided with a control circuit for updating the digitized set value for conversion and converting the updated set value into an analog signal to be supplied to the vector adjuster. Even in the case of linear, there is an effect that a set value of the vector adjuster control circuit outputs can be reliably converged.

According to the present invention, 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 obtain the residual signal included in the distortion component. Calculating the components has the effect of increasing the stability of the control system of the distortion detection circuit.

According to the present invention, the signal component extracted from the output of the main amplifier and the distortion component including the residual signal component detected by the distortion detection circuit are input, the input signal component is digitized, and the input residual signal is input. Digitizing the distortion component including the component, dividing the digitized signal component by a digitized set value for providing to the vector adjuster, and calculating a complex conjugate of the division result and the digitized residual signal component. Multiplying the residual component by multiplying the residual component by multiplying the residual component by the correction coefficient in consideration of the convergence and stability of the control of the distortion detection circuit, thereby adjusting the vector. By providing a control circuit for updating the digitized set value to be given to the vector adjuster and converting the updated set value into an analog signal to be given to the vector adjuster, It is possible to increase the processing speed by reducing the amount of computation circuits, there is an effect that it is possible to quicken the response of the control system of the distortion detection circuit.

According to the present invention, 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 to obtain the distortion component. By calculating the residual signal component contained in the input signal, the control can be performed without depending on the magnitude of the signal component of the input signal, so that there is an effect that the stability can be further improved.

According to the present invention, the distortion component extracted from the output of the auxiliary amplifier and the signal component including the residual distortion component output from the distortion removing circuit are input, the input distortion component is digitized, and the input residual distortion is input. Digitizing the signal component including the component, dividing the digitized distortion component by a digitized set value to be provided to the vector adjuster, and dividing the result by the signal component including the digitized residual distortion component. To calculate the residual distortion component included in the signal component, multiply the calculated residual distortion component by a correction coefficient in consideration of the convergence and stability of the control of the distortion removal circuit, and give the result to the vector adjuster. The control circuit for updating the digitized set value for the analog signal and converting the updated set value into an analog signal and providing the analog signal to the vector adjuster is provided. But, there is an effect that a set value of the vector adjuster control circuit outputs can be reliably converged.

According to the present invention, the control circuit multiplies the complex conjugate of the division result by the signal component including the digitized residual distortion component, time-averages the multiplication result, and calculates the residual distortion included in the signal component. By calculating the components, there is an effect that the stability of the control system of the distortion removal circuit can be increased.

According to the present invention, 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 the input residual distortion is input. Digitizing the signal component including the component, dividing the digitized distortion component by a digitized set value to be supplied to the vector adjuster, and calculating the complex conjugate of the division result and the digitized residual distortion component. By multiplying the residual distortion component included in the signal component by multiplying the calculated residual distortion component, and multiplying the calculated residual distortion component by a correction coefficient in consideration of the convergence and stability of the control of the distortion removal circuit, vector adjustment is performed. A control circuit for updating the digitized set value to be given to the vector adjuster, converting the updated set value into an analog signal, and providing the analog value to the vector adjuster is provided. The calculation amount reduced to be able to increase the processing speed, there is an effect that it is possible to quicken the response of the control system of the distortion elimination circuit.

According to the present invention, 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. By calculating the residual distortion component included in the component, the control can be performed without depending on the magnitude of the distortion component of the main amplifier, so that there is an effect that the stability can be further improved.

According to the present invention, the desired signal component obtained by combining the input signal extracted from the output of the main amplifier and the pilot signal and the distortion component including the residual desired wave component detected by the distortion detection circuit are input and input. Digitizing the desired wave component, digitizing the distortion component including the input residual desired wave component, and dividing the digitized desired wave component by a digitized set value for providing to the vector adjuster. The correlation between the result and the digitized distortion component including the desired residual wave component is calculated to calculate the residual desired wave component included in the distortion component, and the convergence and stability of the control of the distortion detection circuit is calculated for the calculated residual desired wave component. Multiplied by a correction coefficient in consideration of performance, updates the digitized set value to be given to the vector adjuster, converts the updated set value into an analog signal, and With the provision of the control circuit provided to the amplifier, even when the main amplifier is non-linear, the set value of the vector adjuster output by the control circuit can be reliably converged, and the distortion detection operation can be accurately performed. This has the effect.

According to the present invention, the control circuit multiplies the complex conjugate of the division result by the distortion component containing the digitized residual desired wave component, and time-averages the multiplication result to obtain the residual component included in the distortion component. Calculating the desired wave component has the effect of increasing the stability of the control system of the distortion detection circuit.

According to the present invention, the desired signal component obtained by combining the input signal extracted from the output of the main amplifier and the pilot signal, and the distortion component including the residual desired wave component detected by the distortion detection circuit are input and input. Digitizing the desired wave component, digitizing the distortion component including the input residual desired wave component, and dividing the digitized desired wave component by a digitized set value for providing to the vector adjuster. The complex conjugate of the result is multiplied by the digitized distortion component including the residual desired wave component to calculate the residual desired wave component included in the distortion component, and the control of the distortion detection circuit converges on the calculated residual desired wave component. Multiplied by a correction coefficient in consideration of performance and stability, updates the digitized set value to be given to the vector adjuster, converts the updated set value into an analog signal, By having a control circuit for applying a torque regulator, to reduce the computational complexity of the control circuit it is possible to increase the processing speed, there is an effect that it is possible to quicken the response of the control system of the distortion detection circuit.

According to the present invention, the control circuit multiplies the complex conjugate of the division result by the distortion component including the digitized residual desired wave component, normalizes the multiplication result by the instantaneous power of the division result, and corrects the distortion. By calculating the residual desired wave component included in the component, the control can be performed without depending on the magnitude of the signal component of the input signal, so that there is an effect that the stability can be further improved.

According to the present invention, a signal component including an unnecessary wave component due to the distortion component of the main amplifier and the pilot signal component extracted from the output of the auxiliary amplifier and a signal component including a residual unnecessary wave component output from the distortion removal circuit are input. Digitizing the input unnecessary wave component, digitizing the signal component including the input residual unnecessary wave component, and dividing the digitized unnecessary wave component by a digitized set value for providing to the vector adjuster, A correlation between the result of the division and the digitized signal component including the unnecessary unnecessary wave component is calculated to calculate a residual unnecessary wave component included in the signal component, and the calculated residual unnecessary wave component is converged by the control of the distortion removing circuit. And the correction factor in consideration of stability, update the digitized set value to be given to the vector adjuster, and convert the updated set value to analog. Since the control circuit for the vector adjuster is provided, even when the auxiliary amplifier is nonlinear, the set value of the vector adjuster output from the control circuit can be reliably converged and the distortion detection operation can be accurately performed. There is an effect that can be.

According to the present invention, the control circuit multiplies the complex conjugate of the division result by the digitized signal component including the unnecessary unnecessary wave component, time-averages the multiplication result, and calculates the residual value included in the signal component. By calculating the unwanted wave component,
There is an effect that the stability of the control system of the distortion removal circuit can be improved.

According to the present invention, the distortion component of the main amplifier extracted from the output of the auxiliary amplifier, the unnecessary wave component due to the pilot signal component, and the signal component including the residual unnecessary wave component output from the distortion removal circuit are input. Digitizing the input unnecessary wave component, digitizing the signal component including the input residual unnecessary wave component, and dividing the digitized unnecessary wave component by a digitized set value for providing to the vector adjuster, The complex conjugate of the division result is multiplied by a digitized signal component including a residual unnecessary wave component to calculate a residual unnecessary wave component included in the signal component, and the calculated residual unnecessary wave component is controlled by a distortion removing circuit. Multiplying by a correction coefficient considering the convergence and stability of the vector adjuster, update the digitized set value to be given to the vector adjuster, and analyze the updated set value. By providing a control circuit which is applied to the vector adjuster, the amount of calculation in the control circuit can be reduced, the processing speed can be increased, and the response of the control system of the distortion removal circuit can be accelerated. There is.

According to the present invention, the control circuit multiplies the complex conjugate of the division result by the digitized signal component including the residual unnecessary wave component, and normalizes the multiplication result by the instantaneous power of the division result to obtain a signal. By calculating the residual unnecessary wave component included in the component, the control can be performed without depending on the magnitude of the distortion component of the main amplifier. Therefore, there is an effect that the stability can be further improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an operation principle of a distortion removal circuit of a feedforward amplifier according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a feedforward amplifier according to Embodiment 1 of the present invention.

FIG. 3 is a block diagram showing an internal configuration of a control circuit of the feedforward amplifier according to the first embodiment of the present invention.

FIG. 4 is a diagram showing convergence characteristics of set values output by a control circuit of the feedforward amplifier according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing an internal configuration of a control circuit of a feedforward amplifier according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing an internal configuration of a control circuit of a feedforward amplifier according to a third embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a feedforward amplifier according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a feedforward amplifier according to Embodiment 5 of the present invention.

FIG. 9 is a block diagram showing a configuration of a conventional feedforward amplifier.

FIG. 10 is a block diagram showing an internal configuration of a control circuit of a conventional feedforward amplifier.

FIG. 11 is a diagram showing convergence characteristics of set values output by a control circuit of a conventional feedforward amplifier.

FIG. 12 is a diagram illustrating an operation principle of a conventional distortion removal circuit of a feedforward amplifier.

FIG. 13 is a diagram showing a function of an error signal power in a conventional feedforward amplifier.

[Explanation of symbols]

1 distortion detection circuit, 2 distortion removal circuit, 3 main amplifier signal path, 4 linear signal path, 5 main amplifier output path, 6 distortion injection path, 11 power divider, 12 vector adjuster,
13 main amplifier, 14 directional coupler, 15 oscillator,
16 directional coupler, 17 oscillator, 18 directional coupler, 20 power distributor, 21 power combiner, 22 directional coupler, 23 directional coupler, 24 directional coupler,
25 vector adjuster, 26 auxiliary amplifier, 27 power combiner, 31 input terminal, 32 output terminal, 33 directional coupler, 34 band cut filter, 35 band cut filter, 38 divider, 39 control circuit, 51 control circuit, 52 control circuit, 61 AD converter, 62 divider,
63 complex conjugator, 64 AD converter, 65 multiplier,
66 integrator, 67 correction coefficient setter, 68 multiplier,
69 Set value updater, 70 DA converter, 71 correlator, 72 instantaneous power detector, 73 divider.

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[Procedure amendment]

[Submission date] November 27, 2001 (2001.11.
27)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

Generally, assuming that 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 given by the following equation (4).
It is shown by the formula. W (t + 1) = W (t) -μ∂Pe (W) / ∂W (t) (4) In the above equation (4), μ is a correction coefficient and ∂Pe (W) /
∂W ( t ) is the error signal power Pe (W) at the set value W ( t ).
And the gradient in the function of the error signal power Pe (W).

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

[0026] In equation (5), it is assumed that the auxiliary amplifier 2 6 is <br/> linear, the non-linear auxiliary amplifier 26, since the passing gain and passing phase is changed by the set value W G (W), and the set value W (t + 1) at the update count t + 1 is expressed by the following equation (6). W (t + 1) = W (t) −2 μ · G ^* (W) · Vd ^* · Ve (6)

[Procedure amendment 3]

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FIG. 2 is a block diagram showing a configuration of the feedforward amplifier according to the first embodiment of the present invention.
In the figure, 22 is a directional coupler, 34 and 35 are band cut filters, 51 and 52 are control circuits, and the other configuration is such that the directional coupler 14 of the distortion detection circuit 1 is deleted, and the distortion removal circuit 2 The directional coupler 24 in FIG.
The configuration is the same as the conventional configuration shown in FIG.

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 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatoshi Nakayama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Co., Ltd. (72) Inventor Yukio Ikeda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Ryo Denki Co., Ltd. (reference) 5J090 AA01 AA41 CA21 CA85 FA08 GN02 GN05 GN07 HN01 HN04 HN07 HN16 KA34 KA45 MA14 SA14 TA01 TA02 5K060 BB07 HH03 HH37 JJ16 KK03 KK04 KK06 LL24

Claims (20)

[Claims] An input signal is adjusted in amplitude and phase by a vector adjuster controlled based on a given set value, amplified by a main amplifier, and combined with a distributed input signal, thereby obtaining a residual input signal. A distortion detection circuit that detects a distortion component of the main amplifier including a signal component, a distortion component including a residual signal component detected by the distortion detection circuit, and a residual distortion component by combining an output of the main amplifier. A feed-forward amplifier having a distortion removing circuit for outputting a signal component including the signal component, wherein the signal component extracted from the output of the main amplifier is divided by the set value of the vector adjuster, and the result of the division is detected by the distortion detecting circuit. A control circuit for calculating a residual signal component included in the distortion component based on the distortion component including the obtained residual signal component, and controlling a next set value of the vector adjuster. Feedforward amplifier, characterized in that the. 2. A distortion detection circuit for amplifying an input signal by a main amplifier and combining the input signal with a distributed input signal to detect a distortion component of the main amplifier including a residual signal component of the input signal; A distortion component including a residual signal component detected by a circuit is adjusted in amplitude and phase by a vector adjuster controlled based on a given set value, amplified by an auxiliary amplifier, and combined with the output of the main amplifier. Thus, in a feedforward amplifier including a distortion removal circuit that outputs a signal component including a residual distortion component, the distortion component extracted from the output of the auxiliary amplifier is divided by the set value of the vector adjuster, and the division result is A residual distortion component included in the signal component is calculated based on the signal component including the residual distortion component output from the distortion removal circuit, and the next set value of the vector adjuster is calculated. Feedforward amplifier, characterized in that it comprises a control circuit for controlling. 3. A desired wave component obtained by synthesizing an input signal and a pilot signal inputted from the outside is adjusted in amplitude and phase by a vector adjuster controlled based on a given set value, and is amplified by a main amplifier. By combining with the distributed desired wave component, a distortion detection circuit that detects a distortion component of the main amplifier including the residual desired wave component, and a distortion component including the residual desired wave component detected by the distortion detection circuit, By combining the outputs of the main amplifier,
In a feedforward amplifier including a distortion removal circuit that outputs a desired wave component including a residual distortion component, the desired wave component extracted from the output of the main amplifier is divided by the set value of the vector adjuster, and the result of the division is obtained. A control circuit for calculating a 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 controlling a next set value of the vector adjuster. Features feedforward amplifier. 4. A distortion component of the main amplifier including a residual signal component of the input signal by combining an input signal with a pilot signal input from the outside, amplifying the amplified signal by a main amplifier, and combining the divided input signal. And a distortion detection circuit for detecting an unnecessary wave component due to a pilot signal component, and an unnecessary wave component including a residual signal component detected by the distortion detection circuit, the amplitude and the amplitude of which are controlled by a vector adjuster controlled based on a given set value. By adjusting the phase, amplifying by the auxiliary amplifier and combining with the output of the main amplifier,
In a feedforward amplifier including a distortion removal circuit that outputs a signal component including a residual unnecessary wave component, an unnecessary wave component extracted from an output of the auxiliary amplifier is divided by a set value of the vector adjuster, and the division result is A control circuit that calculates a residual unnecessary wave component included in the signal component based on the signal component including the residual unnecessary wave component output from the distortion removal circuit, and controls a next set value of the vector adjuster. Features feedforward amplifier. 5. The residual signal of an input signal is adjusted by adjusting an amplitude and a phase by a vector adjuster controlled based on a given set value, amplifying the input signal by a main amplifier, and combining the amplified input signal with a distributed input signal. A distortion detection circuit that detects a distortion component of the main amplifier including a signal component, a distortion component including a residual signal component detected by the distortion detection circuit, and a residual distortion component by combining an output of the main amplifier. And a distortion removal circuit that outputs a signal component that includes a signal component extracted from the output of the main amplifier and a distortion component that includes a residual signal component detected by the distortion detection circuit. Digitized signal components, and digitized distortion components including input residual signal components.
The digitized signal component is divided by a digitized set value to be provided to the vector adjuster, and a correlation between the result of the division and a distortion component including a digitized residual signal component is obtained and included in the distortion component. Digitized set value for calculating the residual signal component to be calculated, multiplying the calculated residual signal component by a correction coefficient in consideration of the convergence and stability of the control of the distortion detection circuit, and giving the resultant to the vector adjuster. And a control circuit for converting the updated set value into an analog signal and providing the analog value to the vector adjuster. 6. The control circuit multiplies the complex conjugate of the division result by a distortion component including a digitized residual signal component,
6. The feedforward amplifier according to claim 5, wherein a result of the multiplication is time-averaged to calculate a residual signal component included in the distortion component. 7. The residual signal of an input signal is adjusted by adjusting an amplitude and a phase by a vector adjuster controlled based on a given set value, amplifying the input signal by a main amplifier, and combining the amplified input signal with a distributed input signal. A distortion detection circuit that detects a distortion component of the main amplifier including a signal component, a distortion component including a residual signal component detected by the distortion detection circuit, and a residual distortion component by combining an output of the main amplifier. And a distortion removal circuit that outputs a signal component that includes a signal component extracted from the output of the main amplifier and a distortion component that includes a residual signal component detected by the distortion detection circuit. Digitized signal components and digitized distortion components including the input residual signal components,
The digitized signal component is divided by a digitized set value to be provided to the vector adjuster, and a complex conjugate of the division result is multiplied by a distortion component including a digitized residual signal component to obtain a distortion. The residual signal component included in the component is calculated, and the calculated residual signal component is multiplied by a correction coefficient in consideration of the convergence and stability of the control of the distortion detection circuit, and is digitized for application to the vector adjuster. A feed-forward amplifier comprising a control circuit for updating the set value, converting the updated set value into an analog signal, and providing the analog value to the vector adjuster. 8. The control circuit multiplies a complex conjugate of the division result by a distortion component including a digitized residual signal component,
8. The feedforward amplifier according to claim 7, wherein the multiplication result is normalized by the instantaneous power of the division result to calculate a residual signal component included in a distortion component. 9. A distortion detection circuit for amplifying an input signal by a main amplifier and combining the input signal with a distributed input signal to detect a distortion component of the main amplifier including a residual signal component of the input signal; A distortion component including a residual signal component detected by a circuit is adjusted in amplitude and phase by a vector adjuster controlled based on a given set value, amplified by an auxiliary amplifier, and combined with the output of the main amplifier. And a distortion removing circuit that outputs a signal component including a residual distortion component, wherein the distortion component extracted from the output of the auxiliary amplifier and the signal including the residual distortion component output from the distortion removing circuit. Components, digitize the input distortion components, digitize the input signal components including residual distortion components, and digitize the digitized distortion components. Divide by a digitized set value to give to the vector adjuster, calculate the correlation between the division result and the signal component including the digitized residual distortion component, calculate the residual distortion component included in the signal component, The calculated residual distortion 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. A feed-forward amplifier comprising a control circuit that converts the analog signal into an analog signal and supplies the analog signal to the vector adjuster. 10. A control circuit multiplies a complex conjugate of a division result by a signal component including a digitized residual distortion component, and time-averages the multiplication result to calculate a residual distortion component included in the signal component. The feedforward amplifier according to claim 9, wherein: 11. A distortion detection circuit for amplifying an input signal by a main amplifier and combining the input signal with a distributed input signal to detect a distortion component of the main amplifier including a residual signal component of the input signal; A distortion component including a residual signal component detected by a circuit is adjusted in amplitude and phase by a vector adjuster controlled based on a given set value, amplified by an auxiliary amplifier, and combined with the output of the main amplifier. And a distortion removing circuit that outputs a signal component including a residual distortion component, wherein the distortion component extracted from the output of the auxiliary amplifier and the signal including the residual distortion component output from the distortion removing circuit. Input the components, digitize the input distortion components, digitize the signal components including the input residual distortion components, and convert the digitized distortion components Dividing by a digitized set value to be provided to the vector adjuster, multiplying a complex conjugate of the division result by a signal component including a digitized residual distortion component, and calculating a residual distortion component included in the signal component Is calculated, and the calculated residual distortion component is multiplied by a correction coefficient in consideration of the convergence and stability of the control of the distortion removal circuit to update a digitized set value to be given to the vector adjuster, A feedforward amplifier comprising a control circuit that converts the updated set value into an analog signal and supplies the analog signal to the vector adjuster. 12. A control circuit multiplies a complex conjugate of a division result by a signal component including a digitized residual distortion component, and normalizes the multiplication result by the instantaneous power of the division result to be included in the signal component. The feedforward amplifier according to claim 11, wherein a residual distortion component is calculated. 13. A main wave amplifier comprising a desired wave component obtained by synthesizing an input signal and a pilot signal inputted from the outside, the amplitude and phase of which are adjusted by a vector adjuster controlled based on a given set value, and By combining with the distributed desired wave component, a distortion detection circuit that detects a distortion component of the main amplifier including the residual desired wave component, and a distortion component including the residual desired wave component detected by the distortion detection circuit, By combining the outputs of the main amplifier,
A feed-forward amplifier including a distortion removal circuit that outputs a desired wave component including a residual distortion component, the feedforward amplifier including a desired wave component extracted from an output of the main amplifier and a residual desired wave component detected by the distortion detection circuit. A distortion component is input, the input desired wave component is digitized, the distortion component including the input residual desired wave component is digitized, and the digitized desired wave component is digitized to be supplied to the vector adjuster. The calculated desired residual wave component is calculated by calculating the correlation between the result of the division and the distortion component including the digitized residual desired wave component, and calculating the residual desired wave component included in the distortion component. Multiply by a correction coefficient considering the convergence and stability of the control of the distortion detection circuit, and update the digitized set value to be given to the vector adjuster. And a control circuit for converting the updated set value into an analog signal and providing the analog signal to the vector adjuster. 14. A control circuit multiplies a complex conjugate of a division result by a distortion component including a digitized residual desired wave component, and time-averages the multiplication result to obtain a residual desired wave component included in the distortion component. 14. The feedforward amplifier according to claim 13, wherein the calculation is performed. 15. A desired wave component obtained by synthesizing an input signal and a pilot signal input from the outside, the amplitude and phase are adjusted by a vector adjuster controlled based on a given set value, and amplified by a main amplifier. By combining with the distributed desired wave component, a distortion detection circuit that detects a distortion component of the main amplifier including the residual desired wave component, and a distortion component including the residual desired wave component detected by the distortion detection circuit, By combining the outputs of the main amplifier,
A feed-forward amplifier including a distortion removal circuit that outputs a desired wave component including a residual distortion component, the feedforward amplifier including a desired wave component extracted from an output of the main amplifier and a residual desired wave component detected by the distortion detection circuit. A distortion component is input, the input desired wave component is digitized, the distortion component including the input residual desired wave component is digitized, and the digitized desired wave component is digitized to be supplied to the vector adjuster. The calculated residual desired wave component is calculated by multiplying the complex conjugate of the result of the division by the distortion component including the digitized residual desired wave component, and calculating the residual desired wave component included in the distortion component. Digitized set value for multiplying the component by a correction coefficient in consideration of the convergence and stability of the control of the distortion detection circuit and giving the vector adjuster And a control circuit for converting the updated set value into an analog signal and providing the analog value to the vector adjuster. 16. A control circuit multiplies a complex conjugate of a division result by a distortion component including a digitized residual desired wave component, normalizes the multiplication result by the instantaneous power of the division result, and includes the result in the distortion component. 16. The feedforward amplifier according to claim 15, wherein a residual desired wave component to be calculated is calculated. 17. A distortion component of the main amplifier including a residual signal component of the input signal by combining an input signal with a pilot signal input from the outside, amplifying the amplified signal by a main amplifier, and combining the divided input signal. And a distortion detection circuit for detecting an unnecessary wave component due to a pilot signal component, and an unnecessary wave component including a residual signal component detected by the distortion detection circuit, the amplitude and the amplitude of which are controlled by a vector adjuster controlled based on a given set value. By adjusting the phase, amplifying by the auxiliary amplifier and combining with the output of the main amplifier,
A feed-forward amplifier including a distortion removing circuit that outputs a signal component including a residual unnecessary wave component, wherein the unnecessary forward wave component extracted from the output of the auxiliary amplifier and the residual unnecessary wave component output from the distortion removing circuit are included. Input the signal component, digitize the input unnecessary wave component,
The input signal component including the residual unnecessary wave component is digitized, and the digitized unnecessary wave component is divided by a digitized set value to be provided to the vector adjuster, and the division result is digitized. The residual unnecessary wave component included in the signal component is calculated by calculating the correlation with the signal component including the residual unnecessary wave component, and the calculated residual unnecessary wave component is corrected in consideration of the convergence and stability of the control of the distortion removal circuit. A feed-forward comprising a control circuit for multiplying a coefficient to update a digitized set value to be provided to the vector adjuster, converting the updated set value into an analog signal, and applying the converted set value to the vector adjuster amplifier. 18. A control circuit multiplies a complex conjugate of a division result by a digitized signal component including a residual unnecessary wave component, and time-averages the multiplication result to obtain a residual unnecessary wave component included in the signal component. 18. The calculation according to claim 17, wherein the calculation is performed.
A feedforward amplifier as described. 19. A distortion component of the main amplifier including a residual signal component of an input signal by combining an input signal with a pilot signal input from the outside, amplifying the amplified signal by a main amplifier, and combining the divided input signal. And a distortion detection circuit for detecting an unnecessary wave component due to a pilot signal component, and an unnecessary wave component including a residual signal component detected by the distortion detection circuit, the amplitude and the amplitude of which are controlled by a vector adjuster controlled based on a given set value. By adjusting the phase, amplifying by the auxiliary amplifier and combining with the output of the main amplifier,
A feed-forward amplifier including a distortion removing circuit that outputs a signal component including a residual unnecessary wave component, wherein the unnecessary forward wave component extracted from the output of the auxiliary amplifier and the residual unnecessary wave component output from the distortion removing circuit are included. Input the signal component, digitize the input unnecessary wave component,
Digitizing the input signal component including the residual unnecessary wave component, dividing the digitized unnecessary wave component by a digitized set value to be provided to the vector adjuster, and obtaining a complex conjugate of the division result and the digital value. Is multiplied by the signal component including the residual unnecessary wave component, and the residual unnecessary wave component included in the signal component is calculated. The convergence and stability of the control of the distortion removing circuit are calculated by the calculated residual unnecessary wave component. A control circuit for multiplying the corrected correction factor in consideration to update the digitized set value to be provided to the vector adjuster, converting the updated set value into an analog signal, and applying the converted set value to the vector adjuster. Feed forward amplifier. 20. A control circuit multiplies a complex conjugate of the division result by a digitized signal component including a residual unnecessary wave component, normalizes the multiplication result with the instantaneous power of the division result, and includes the result in the signal component. 20. The feedforward amplifier according to claim 19, wherein the residual unnecessary wave component is calculated.