JP2002151972A - Distortion compensation power amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distortion compensation power amplifier that controls the amplitude and the phase of each harmonic component of a distorted signal so as to stably eliminate the distorted signal in the main amplifier. SOLUTION: The distortion compensation power amplifier is configured such that the main signal component is eliminated from a signal generated from distortion generating amplifiers 21, 22 of distortion eliminating blocks 501, 502 corresponding to each harmonic component, the obtained distorted signal in each harmonic is independently controlled in each harmonic so as to have the same amplitude as and the opposite phase to those of the distorted signal of the main signal and the controlled signal is superimposed on the main signal and the resulting signal is applied to the main amplifier. Thus, the generated amount of distortion in the main amplifier can be reduced. Thus, the distortion compensation power amplifier is obtained, where the accuracy of eliminating distortion is enhanced and the distorted signal from the main amplifier can stably be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-distortion power amplifier, and more particularly to a distortion-compensated power amplifier suitable for a high-frequency power amplifier for a radio communication device.

[0002]

2. Description of the Related Art FIG. 13 shows a conventional example of this kind of distortion compensation power amplifier. The power amplifier shown in FIG. 13 includes a directional coupler 906 for extracting a part of an input signal, and a first hybrid provided at an output of the directional coupler 906 and distributing power to a first and a second output (2). Power splitter) 901 and a diode or Ga connected to the first output of the first power splitter.
A distortion generating circuit 902 which is formed of a non-linear element such as an AsFET and generates a third-order distortion, a variable attenuator 950 connected to the distortion generating circuit 902 for amplitude adjustment, and connected to a second output of the first power distributor 901 And a variable phase shifter 951 for adjusting the amount of phase, and an output of the variable attenuator 950 as a first input, and an output of the variable phase shifter 951 as a second input.
Second hybrid (power combiner) 9 that combines two inputs of
30, a main amplifier 913 that receives the output of the second power combiner 930 as an input, a detection circuit 907 that detects a signal obtained by extracting a part of the input signal from the directional coupler 906, and an output of the detection circuit 907. A distortion generation bias control circuit 908 for changing the bias of the variable attenuator 950 for changing the degree of attenuation of the output of the distortion generation circuit 902, and a phase bias control circuit 909 for changing the bias of the variable phase shifter 951 based on the output of the detection circuit 907. It is composed of A distortion-compensating power amplifier having such a configuration is disclosed in, for example,
It is disclosed in JP-A-65052.

[0003] An input signal from an input terminal 911 passes through a directional coupler 906, and is then divided into two by a first power combiner 901 into first and second outputs. The first output is input to a distortion generation circuit 902 to generate a third-order distortion, and the variable attenuator 950 adjusts the amplitude. The second output of the first power combiner 901 is adjusted by the phase bias control circuit 909 so as to suppress the phase fluctuation of the signal from the first output of the first power combiner to the second power combiner 930. You. Further, the distortion generation amount of the distortion generation circuit is controlled by the distortion generation bias control circuit 908 according to the input signal level. As described above, since the amount of distortion and the phase fluctuation are controlled by the input signal level, the main amplifier 913 can stably compensate for the distortion of the input level.

[0004]

In the above-mentioned prior art, a distortion signal is generated by utilizing the nonlinearity of a diode or a transistor with respect to an input signal. At this time, the signal component appearing in the output signal is both the input main signal component and the distortion component generated due to the non-linearity. When synthesizing this output and a signal to which no distortion has been added after passing through the variable phase shifter, there is some phase difference with respect to the main signal component. In the conventional example, the phase difference is such that the distortion of the main amplifier is removed, and the first main signal component that has passed through the distortion generator and the second main signal component that has passed through the variable phase shifter are different from each other. It can be said that there is no correlation between them. Therefore, when adjusting the variable phase shifter to suppress the phase fluctuation of the distortion, the phase relationship between the first main signal and the second main signal fluctuates from the same phase to the opposite phase.

Accordingly, the main signal component supplied to the main amplifier becomes a signal level which is added or subtracted from the originally input signal level due to phase fluctuation, and this signal level which is added to or subtracted from the main signal component becomes Not stable. Furthermore, since the amount of distortion generated by the main amplifier fluctuates due to the fluctuation of the main signal component, the amount of distortion and the phase of the distortion generating circuit must always be adjusted, and the distortion is not stable even when it is removed. In particular, when dealing with multiple waves of unmodulated signals, and when dealing with modulated waves, control the amplitude and phase in the same way as above for distortion signals of all orders,
It is difficult to apply to the main amplifier. For example, when the main amplifier approaches the saturation power, the phase difference between the distortion signals of each order becomes zero.
Not. Therefore, only the order of a specific distortion signal is removed, and a distortion signal of another order may cause a phenomenon of being inversely added. Therefore, in the conventional example, no consideration has been given to always stably removing distortion signals of each order.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compensated power amplifier that controls the amplitude and phase of each order of a distortion signal and can stably remove the distortion signal of the main amplifier.

[0007]

First, the outline of a typical invention among the inventions disclosed by the present application will be briefly described as follows.

That is, the distortion-compensated power amplifier according to the present invention distributes an input signal, generates a distortion signal by a small power amplifier, and removes a main signal component by a power combiner to obtain a third-order distortion component. The third-order distortion component is further distributed by the power divider, and the third-order distortion component is removed from the distortion signal generated by the other distortion generator by the power combiner to become a fifth-order distortion signal component. Similarly, a third-order distortion component,
And a fifth-order distortion component are subtracted from other distortion generators to generate a seventh-order distortion. Similarly, a higher-order distortion signal can be generated by subtracting each order from the output of the added distortion generator. The amplitude and phase of the generated distortion signals of the respective orders are independently controlled by the vector adjuster, and the main signal components and the power combiner are combined and applied to the main amplifier. Thus, since the distortion signals generated by the distortion generators of the respective orders are independently applied with the same amplitude and opposite phase to the distortion signal of the main amplifier, stable distortion compensation can be realized.

In order to achieve the above object, according to the present invention, there are provided: (1) power distribution means for distributing input power to three outputs; First distortion generating means for generating a first distortion signal, first distortion extracting means for extracting a third-order distortion signal from the first distortion signal, and determining the amplitude and phase of the extracted third-order distortion signal. A third-order distortion removing block comprising a first distortion adjusting unit for adjusting; a second distortion generating unit for generating a second distortion signal from another one of the outputs of the three systems; Second distortion extracting means for extracting a fifth-order distortion signal from the second distortion signal and the extracted third-order distortion signal, and second distortion adjusting means for adjusting the amplitude and phase of the extracted fifth-order distortion signal. And a fifth-order distortion removal block consisting of The first provided in the signal path of the output of the remaining one system
And the remaining 1 through the first delay means.
A power combining unit that combines an output of a power system, an output of the third-order distortion removing block, and an output of the fifth-order distortion removing block; and a main amplifier that amplifies an output of the power combining unit to predetermined power. A distortion-compensating power amplifier comprising:
Further, the signal transmission time from the input terminal of the third-order distortion removal block to the input terminal of the power combining means, and the signal transmission time from the input terminal of the fifth-order distortion removal block to the input terminal of the power combining means. And second and third delay means connected to the respective removal blocks, so that the first and second delay means remove the third and fifth order distortion from the output end of the power distribution means. Each of the first and second distortion adjusting units has a delay time corresponding to a signal transmission time to the input terminal of the power combining unit via each block. In order to reduce the third and fifth order distortion components of the generated distortion signal,
A distortion-compensated power amplifier is provided, which adjusts the amplitude and phase of the output of each of the third-order and fifth-order distortion removal blocks.

Here, each of the first and second distortion generating means comprises a distortion amount adjuster, a distortion generator and a vector adjuster, and the first and second distortion extracting means respectively comprise: It is composed of a power combiner for combining a signal via a delay line for delaying an output signal of the power distribution means and an output of the distortion generating means.

In the example shown in FIG. 1 in the embodiment described later, the power distribution means is composed of power distributors 101 and 1
The first distortion generating means corresponds to the portion composed of the distortion generator amount adjuster 31 having one output of the power divider 103 as an input, the distortion generator 21, and the vector adjuster 301. And the second distortion generating means corresponds to a portion including the distortion generation amount adjuster 32, the distortion generator 22, and the vector adjuster 303 having one output of the power distributor 105 as an input. Further, the first distortion extracting means corresponds to a portion composed of a delay line 401 to which the other output of the power divider 103 is connected and the power combiner 201, and the second distortion extracting means corresponds to the distortion extracting section at the preceding stage. It corresponds to a portion composed of a vector adjuster 305 receiving the output of the first distortion extracting means, the delay line 402 connecting the other output of the power divider 105, and the power combiners 204 and 205. Further, the first distortion adjusting means corresponds to the vector adjuster 302, and the second distortion adjusting means corresponds to the vector adjuster 304. Still further, the first delay means corresponds to delay line 405, the second delay means corresponds to delay line 404, and the third delay means corresponds to delay line 40.
Corresponds to 3. The power combining means includes power combiners 202 and 2
03 corresponds to the portion composed of.

Further, according to the present invention, (2) a power distribution means for distributing input power to four outputs, and generating a first distortion signal from one of the four outputs. The first distortion generating means includes first distortion extracting means for extracting a third-order distortion signal from the first distortion signal, and first distortion adjusting means for adjusting the amplitude and phase of the extracted third-order distortion signal. A third-order distortion removing block, second distortion generating means for generating a second distortion signal from another one of the outputs of the four systems, and the extracted third-order distortion signal. A fifth-order distortion removing block including second distortion extracting means for extracting a fifth-order distortion signal from the distortion signal and second distortion adjusting means for adjusting the amplitude and phase of the extracted fifth-order distortion signal; From the output of another one of the outputs of A third distortion generating unit for generating a signal, a third distortion extracting unit for extracting a seventh-order distortion signal from the third distortion signal and the extracted fifth-order distortion signal, and a third distortion extracting unit for extracting the seventh-order distortion signal. A seventh-order distortion removing block comprising a third distortion adjusting unit for adjusting the amplitude and the phase, and a first delay provided in a signal path of the remaining one of the four outputs of the power distribution unit. Means for combining the output of the remaining one system, the output of the third-order distortion removal block, the output of the fifth-order distortion removal block, and the output of the seventh-order distortion removal block via the first delay means. What is claimed is: 1. A distortion-compensating power amplifier comprising: a power combining unit; and a main amplifier that amplifies an output of the power combining unit to a predetermined power. Signal transmission to the input Time, a transmission time of the signal from the input of the fifth-order distortion removal block to an input terminal of said power combining means, said 7
Second, third and fourth delay means connected to the respective removal blocks so that the signal transmission time from the input end of the next distortion removal block to the input end of the power combining means is equal. The first delay means sets a delay time corresponding to a delay time from an output end of the power distribution means to an input end of the power synthesis means via the third-, fifth-, and seventh-order distortion removal blocks. Having the first, second,
The third distortion adjustment means reduces the third, fifth, and seventh order distortion components of the distortion signal generated when the main signal is amplified by the main amplifier, respectively. Provided is a distortion-compensated power amplifier that adjusts the amplitude and phase of the output of each distortion removal block.

[0013] Here, FIG.
In the example shown in FIG. 1, the power distribution means is a power distributor 1
01, 102, and 106,
And the second distortion generating means is the same as that described in the above (1). The third distortion generating means corresponds to a part configured by the distortion generation amount adjuster 33, the distortion generator 23, and the vector adjuster 306 which receive one output of the power divider 108 as an input. The first and second distortion extracting means are the same as those described in the above (1). The third distortion extracting means includes a vector adjuster 309 receiving one output obtained by distributing the output of the second distortion extracting means, which is the preceding-stage distortion extracting means, by the power distributor 107, and A vector adjuster 308 that receives one output obtained by distributing the output of a certain first distortion extraction unit by the power distributors 104 and 109;
Delay line 402 to which the other output of power divider 108 is connected
And power combiners 206, 207, and 208. Further, the first and second distortion adjusting means are the same as those described in the above (1). The third distortion adjusting means corresponds to the vector adjuster 307. Furthermore, the first and second delay means are the same as those described in (1) above, the third delay means corresponds to the delay lines 403 and 408, and the fourth delay means corresponds to the delay line 407. The power combining means corresponds to a portion composed of the power combiners 202, 203, and 209.

(3) In the distortion-compensated power amplifier according to the above (1) or (2), a part of the output of each order distortion extracting means is extracted into each order distortion removing block,
It is possible to provide a main signal removal automatic control means for controlling the main signal components of the distortion extraction means of each order based on the extracted power so as to minimize the main signal components. As a result, it is possible to further suppress deterioration of the accuracy of removing the main signal due to a change in temperature or aging.

(4) In the distortion-compensated power amplifier according to any one of (1) to (3), means for extracting a part of a signal at a stage subsequent to the main amplifier, and distorting each order from the extracted signal. A distortion detection means for performing frequency conversion and detection for selection, and automatic distortion removal control means for controlling the distortion adjustment means in each of the distortion removal blocks based on an output of the distortion detection means; It is preferable that the control means controls the distortion adjusting means so that the detection value of the distortion detecting means is minimized. As a result, it is possible to further suppress deterioration of the accuracy of removing the main signal and the accuracy of removing the distortion signal due to changes in temperature and time.

Also, according to the present invention, (5) a first power distribution means for distributing input power to two systems of outputs, and an amplitude and phase of an output of one system of the first power distribution means. First vector adjustment means for performing adjustment;
A main amplifier that amplifies the output of the one system via the first vector adjustment unit, a second power distribution unit that distributes an output of the main amplifier to an output of the two systems, and the second power distribution unit First combining means for combining the output of one system of the means and the output of the other system of the first power distribution means, and a second means for adjusting the amplitude and phase of the output of the first combining means. Vector adjusting means, an error amplifier for amplifying an output signal of the first combining means via the second vector adjusting means, and an output signal of the error amplifier and the other system of the second power distribution means. And a distortion compensator provided on the path of the input terminal of the first vector adjustment unit or the input terminal of the main amplifier. The distortion compensator outputs the input to the distortion compensator through four systems. A third power distribution means for distributing the,
First distortion generating means for generating a first distortion signal from one of the four outputs, and first distortion extracting means for extracting a third-order distortion signal from the first distortion signal; First distortion adjusting means for adjusting the amplitude and phase of the third-order distortion signal so as to reduce the third-order distortion component of the distortion signal generated when the main amplifier amplifies the signal.
Second-order distortion removing block, second distortion generating means for generating a second distortion signal from another one of the four outputs, and the second distortion signal and the extracted third-order distortion Second distortion extracting means for extracting a fifth-order distortion signal from the signal and reducing the fifth-order distortion component of the distortion signal generated when the main amplifier amplifies the signal with the amplitude and phase of the extracted fifth-order distortion signal A fifth-order distortion removing block including a second distortion adjusting unit that adjusts the distortion, and a third distortion generating unit that generates a third distortion signal from another one of the four outputs. Third distortion extracting means for extracting a seventh-order distortion signal from the third distortion signal and the extracted fifth-order distortion signal, and extracting the amplitude and phase of the extracted seventh-order distortion signal by the main amplifier. The 7th-order distortion component of the distortion signal generated when amplifying A seventh-order distortion removing block including a third distortion adjusting unit that adjusts the power distribution, and a signal path of a remaining one of the four outputs of the power distribution unit. First delay means having a delay time corresponding to the signal transmission time from the output end of the means to the input end of the third power combining means via the third, fifth and seventh order distortion removing blocks, respectively; The first
Third power combining means for combining the output of the remaining one system, the output of the third-order distortion removing block, the output of the fifth-order distortion removing block, and the output of the seventh-order distortion removing block via the delay means. And a signal path of the output of the remaining one of the outputs of the four systems, and from the output end of the third power distribution means via the third, fifth and seventh order distortion removal blocks, respectively. A first delay unit having a delay time corresponding to a signal transmission time to an input terminal of the third power combining unit, and further from an input terminal of the third-order distortion removing block to an input terminal of the power combining unit. , The transmission time of the signal from the input terminal of the fifth-order distortion removal block to the input terminal of the power combining means, and the transmission time of the signal from the input terminal of the seventh-order distortion removal block to the input terminal of the power combining means. Signal transmission As time becomes equal second being connected to a respective removal block, distortion compensation power amplifier and having a third and fourth delay means.

In this case, between the output of the other system of the first power distribution means and the input of the first synthesizing means, the output terminal of the one system of the first power distribution means is connected to the second power distribution means. A fifth delay unit having a delay time corresponding to a signal transmission time to an input terminal of the first combining unit; and a fifth delay unit between the output of the main amplifier and the input of the second combining unit. It is preferable to further provide a sixth delay unit corresponding to a signal transmission time from the output terminal to the input terminal of the second combining unit.

Here, in the example shown in FIG. 6 of the embodiment described later, the first power distribution means is a power distributor 1
16, the first vector adjusting means corresponds to the vector adjuster 311 and the second power distribution means corresponds to the power distributor 1
14, the first combining means corresponds to the power combiner 211, and the second vector adjusting means corresponds to the vector adjuster 312.
Corresponding to The distortion compensator 10 is connected to the power combiner 203 from the input end of the power divider 101 having the configuration shown in FIG.
1 except for the main amplifier 15.

As shown in FIG. 6, the main signal removal automatic control means 604, 605, the third, fifth, and seventh order distortion removal automatic control means 701, 702, 703, and the residual distortion removal automatic control means 704 are also provided. Can also be provided.

Alternatively, the distortion compensating unit is configured to exclude the main amplifier 15 from the input end of the power divider 101 having the configuration shown in FIG. 1 to the power combiner 203, and performs third- and fifth-order distortion compensation. It may be.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a distortion-compensated power amplifier according to the present invention will be described below in detail with reference to the accompanying drawings.

<Embodiment 1> FIG. 1 is a block diagram showing an embodiment of a distortion compensation power amplifier according to the present invention. FIGS. 12A to 12H are diagrams schematically showing the spectra at the portions indicated by arrows a to h in FIG. Hereinafter, a description will be given with reference to FIGS.

The input signal from the input terminal 11 is shown in FIG.
The first power divider 101 has a spectrum as shown in FIG.
, And is distributed to two systems by the second power distributor 102 of the third-order distortion removal block 501. In one of the systems, an intermodulation distortion signal is generated by a first distortion generator 21 composed of a small signal power amplifier. The amount of the intermodulation distortion signal generated by the first distortion generator 21 is adjusted by the first distortion generation amount adjuster 31. The output of the first distortion generator 21 having the spectrum of the input main signal component and the distortion signal component as shown in FIG.
The main signal component corresponding to the input signal is removed by subtracting the input signal divided by 3 from the input signal. Thus, the output of the first power combiner 201 is only the intermodulation distortion signal generated by the first distortion generator 21 as shown in the spectrum of FIG.

Here, the condition for removing the main signal component is such that the first input and the second input at the output of the first power combiner 201 have the same amplitude and opposite phase, and are adjusted by the first vector adjuster 301. You. At this time, the first distortion generation amount adjuster 3
By adjusting the value of 1 so that the difference between the third-order distortion signal and the fifth-order distortion signal is maximized, the main component of the output of the first power combiner 201 becomes a third-order distortion component.

The output of the first power combiner 201 is
The power is distributed by the power distributor 104. One of the divided distortion signals is adjusted in amplitude and phase by a second vector adjuster 302, and is output through one output of the first power splitter 101 that has split the input signal and the second power splitter 202. The three power combiners 202 combine. Similarly, the second distortion generator 22 adjusts the other output of the second power divider 102 by the second distortion generation amount adjuster 32 so that the difference between the third-order distortion signal and the fifth-order distortion signal is reduced. A signal is generated. The output of the distortion generator 22 is further adjusted by the third vector adjuster 303, and the fourth power combiner 2
04 removes the main signal component as shown in the spectrum of FIG. The second with the main signal component removed
In order to subtract the distortion signal generated by the first distortion generator 21 from the distortion signal generated by the distortion generator 22, the signal distributed by the fourth power divider 104 is divided into a fifth signal in the fifth-order distortion removal block 502. The amplitude and the phase are adjusted by the five vector adjuster 305, and the fifth power combiner 205 subtracts the amplitude and the phase. The subtraction condition at this time is that the third-order distortion signal of the distortion signal generated by the second distortion generator 22 and the third-order distortion signal of the distortion signal generated by the first distortion generator 21 have the same amplitude and opposite phases. It is.

The output of the fifth power combiner 205 is a signal in which the main signal and the third-order distortion signal have been removed from the distortion signal generated by the second distortion generator 22, and is shown by the spectrum of FIG. As described above, the main component is a fifth-order distortion signal component. The amplitude and phase of the output of the fifth power combiner 205 are adjusted by a fourth vector adjuster 304, and the output of the second power combiner 202 is adjusted.
Is combined with the third-order distortion component generated by the first distortion generator 21. Accordingly, the output of the third power divider 203 is the first
A main signal component not affected by the distortion generator 21 and the second distortion generator 22 and 3
The second-order distortion component and 5 generated by the second distortion generator 22
And a secondary distortion component, and is connected to the main amplifier.

The output of the third power distributor 203 is shown in FIG.
Adjust so as to have the spectrum shown in (g). That is, the second vector adjuster 302 removes the third-order distortion component from the distortion signal generated only by the main signal component in the main amplifier, and the fourth vector adjuster 304 removes the fifth-order distortion component. Adjustments are made so that the amplitude and the phase are converted into the same amplitude in the output of the amplifier 15.

As a result, the distortion-compensated power amplifier according to the present embodiment can stably remove distortion signals of each order independently.

In FIG. 1, the delay line 401 is the third line.
From the output of the power divider 103, the first distortion generation amount adjuster 3
1. First distortion generator 21 and first vector adjuster 3
01 has the same delay time as the signal path leading to the input of the first power combiner 201 through the first power combiner 201, and the delay line 402 receives the output of the fifth power distributor 105 from the second distortion generator 3
2, the second distortion generator 22, and the third vector adjuster 3
It has the same delay time as the delay time of the signal path leading to the input of the fourth power combiner 204 via the signal line 03.

The delay line 403 is connected to the second power distributor 1
From the delay time of the path from the input of the second power divider 02 to the output of the fifth power combiner 205 via the fourth power divider 104, the path of the path from the input of the fifth power divider 105 to the output of the fifth power combiner 205 is determined. It has a delay time minus the delay time.

The delay line 404 outputs the output of the second power combiner 202 from one output of the fourth power divider 104 via the fifth vector adjuster 305, the fifth power combiner 205, and the fourth vector adjuster 304. From the delay time of the route to
It has a delay time obtained by subtracting the delay time of the path from the other output of the power divider 104 to the output of the second power combiner 202 via the second vector adjuster 302.

The delay line 405 is connected to the third-order distortion removing block 501 and the delay line 40 from the output terminal of the first power distributor 101.
4. The third power combiner 20 via the second power combiner 202
3 has a delay time of the path to the input terminal.

Of course, if the signal transmission level is such that the signal delay is negligible, there is no need to provide a delay line, and the same applies to the following embodiments. <Embodiment 2> FIG. FIG. 14 is a block diagram showing another embodiment of the present invention. In the present embodiment, the fourth power divider 104 of the third-order distortion removing block 501 is different from FIG.
A new ninth power divider 109 is inserted on the path from the first to the fifth vector adjuster 305, and the eighth vector adjuster 308 is connected to one output of the ninth power divider 109.

A seventh power divider 107 is newly inserted on the path from the fifth power combiner 205 to the fourth vector adjuster 304 of the fifth-order distortion removing block 502, and one output of the seventh power divider 107 is output. To the ninth vector adjuster 309.

Further, the fourth step of the fifth-order distortion removing block 502
A seventh power combiner 207 is newly added on the path of the sixth power combiner 206 and the eighth power combiner 208 corresponding to the power combiner 204 and the fifth power combiner 205, and the added seventh power combiner An eighth vector adjuster 30 is connected to one input of
8 is connected to the output of the power combiner 206 to the other input, and the output of the ninth vector adjuster 309 is connected to one input of the eighth power combiner 208. 503 is added.

In the added seventh-order distortion removing block 503, the third distortion generator 23 generates a distortion signal from the input signal, and removes the main signal component as in the embodiment shown in FIG. At this time, the third distortion generator 23 adjusts the distortion signal generated by the third distortion generator 23. The distortion signal generated by the third distortion generator 23 from which the main signal component has been removed is subtracted by the seventh power combiner 207 from the third-order distortion signal generated by the third-order distortion removal block 501. Further, the eighth power combiner 208 subtracts the fifth-order distortion signal generated by the fifth-order distortion removal block 502, and the seventh-order distortion signal becomes a main component.

The output of the eighth power combiner 208 is adjusted in amplitude and phase by a seventh vector adjuster 307, and then the ninth power combiner 209, the second power combiner 202, and the third power combiner 203 Are combined with the distortion signal and the input signal generated in each of the other fifth-order distortion removal block 502 and third-order distortion removal block 501, and applied to the main amplifier 15.

Thus, for the distortion signal generated by the main amplifier 15, the seventh-order distortion signal generated from the distortion signal generated by the third distortion generator 23 becomes the seventh vector adjuster 307.
Are adjusted to have the same amplitude and opposite phase, and are independently removed from the output of the main amplifier 15 together with third- and fifth-order distortion components. Therefore, the distortion-compensated power amplifier according to the present embodiment can also stably independently remove the distortion signals of each order, similarly to the above-described embodiment.

In FIG. 2, delay lines 401 to 40
5 is the same as the delay line described in FIG. Delay line 406
Is the distortion generation amount adjuster 3 from the output of the power distributor 108.
3. The delay time of the path leading to the input of the power combiner 206 via the distortion generator 23 and the vector adjuster 306.

The delay line 407 is connected to the power distributor 106
, The distortion adjuster 22, the vector adjuster 30
9 from the other output of the power divider 106 from the delay time of the path to the power combiner 208 via
3. The delay time is obtained by subtracting the delay time of the path from the power combiner 207 to the power combiner 208.

The delay line 408 is connected to the power distributor 107
, The vector adjuster 309 and the power combiner 2
08, power combiner 209 via vector adjuster 307
Of the path leading to the output of the power divider 107 minus the delay time of the path leading to the output of the power combiner 209 via the vector adjuster 304 from the other output of the power divider 107.

<Embodiment 3> FIG. 3 is a block diagram showing another embodiment of the present invention. In the present embodiment, a tenth power divider 110 is inserted on the path from the first power combiner 201 to the fourth power divider 104 in the third-order distortion removal block 501 with respect to FIG. One output of the divider 110 is connected to the input of the fourth power divider 104, and the first main signal removal automatic control means 601 is added to connect the other output of the tenth power divider 110 to this input. ing. The first main signal removal automatic control means 601 includes:
The power level is detected, converted from analog to digital, and the arithmetic processing unit controls the first vector adjuster 301 with a value obtained by digital-to-analog conversion so that the detected value is minimized.

Further, the fourth of the fifth-order distortion removal block 502
The eleventh power splitter 111 is inserted on the path from the power combiner 204 to the fifth power splitter 205, and one output of the eleventh power splitter 111 is connected to the input of the fifth power splitter 205, and the other is connected. The second main signal removal automatic control means 602 for controlling the third vector adjuster 303 is added to the output of the third vector adjuster 303.

Further, the sixth-order distortion removing block 503 of the seventh order
The twelfth power splitter 112 is inserted on the path from the power combiner 206 to the seventh power splitter 207, and one output of the twelfth power splitter 112 is connected to the input of the seventh power splitter 207, and the other. The second main signal elimination automatic control means 602 for controlling the sixth vector adjuster 306 is added to the output of FIG.

The first to third main signal removal automatic control means includes:
As shown in FIG. 8, a detector 43, an analog / digital (A / D) converter 51, an arithmetic processing unit (CPU) 53 mainly composed of a microprocessor, and a digital / analog (D / A) converter 52 Consists of The output of the first power divider 201 is a signal obtained by removing the main signal component from the output of the first distortion generator 21. However, if the adjustment of the first vector adjuster 301 is not good, the first power divider 20
At the output of No. 1, a main signal component appears.

Then, a part of the output of the first power divider 201 is taken out by the tenth power divider 110 and detected by the detector 43 in the first main signal removal automatic control means 601. The detected value is converted to a digital signal,
In step 3, the main signal is calculated by a numerical operation algorithm such as a perturbation method or a least-squares method so that the main signal is minimized, that is, the detection value is minimized, and then the analog signal converted by the D / A converter 52 is used. 1 controls the vector adjuster 301. The first vector adjuster 301 includes a variable attenuator 41 controlled by an analog voltage value and a variable phase shifter 42 as shown in FIG. Second main signal removal automatic control means 602
And the third main signal removal automatic control means 603,
The same operation as the first main signal removal automatic control means 601 is performed.

Therefore, in the distortion-compensated power amplifier of the present embodiment, the main signal is automatically removed, so that it is possible to suppress deterioration of the accuracy of removing the main signal due to a change in temperature or aging, and furthermore, it is possible to achieve a stable operation. In addition, the distortion signals of each order can be independently removed.

<Embodiment 4> FIG. 4 is a block diagram showing another embodiment of the present invention. In the present embodiment, a thirteenth power divider 113 is provided on the path from the main amplifier 15 to the output 12 in FIG. The signal extracted by the thirteenth power divider 113 is supplied to the third-order distortion removal automatic control means 701 having the configuration shown in FIG. 9, the fifth-order distortion removal automatic control means 702 having the configuration shown in FIG. 10, and the configuration shown in FIG. Of the seventh-order distortion removal automatic control means 703. In FIGS. 9 to 11, the number of output D / A converters 52 is one more than the number of outputs shown in FIG. 4, respectively. This is for controlling the distortion generation amount adjuster and the vector adjuster in the removal block, and in the present embodiment, each may be reduced by one. The same applies to the embodiment of FIG. 5 described later.

In the tertiary distortion removal automatic control means 701, as shown in FIG.
The output signal of the power divider 113 is frequency-converted by the transmission frequency of the frequency synthesizer 62 so that the distortion signal remaining in 2 falls within the pass bandwidth of the narrow-band filter 63 in the subsequent stage.

The residual distortion component passed through the narrow band filter 63 is detected by the detector 43, and the detected value is converted into a digital signal by the A / D converter 51. The digital signal is calculated by the arithmetic processing unit 53 by a numerical operation algorithm such as a perturbation method or a least square method so that the main signal becomes the minimum value, that is, the detection value becomes the minimum value.
The second vector adjuster 302 is controlled by the analog value converted by the A converter 52. Similarly, the fifth-order distortion removal automatic controller 702 controls the fourth vector adjuster 304 and the fifth vector adjuster 305, and the seventh-order distortion removal automatic controller 703 controls the seventh vector adjuster 307 and the eighth vector adjuster. 308 and the ninth vector adjuster 309 are controlled.

Therefore, the distortion-compensated power amplifier according to the present embodiment can automatically remove not only the main signal but also the distortion signal. Deterioration can be suppressed. Further, it is possible to stably remove the distortion signals of each order independently.

<Embodiment 5> FIG. 5 is a block diagram showing another embodiment of the present invention. In the present embodiment, the first power divider 101
Is newly provided on the path leading to. The thirteenth terminal connected to the output side of the main amplifier 15
The first fixed attenuator 801 and the third fixed attenuator 801 are provided on a path from one output of the power divider 113 to the third-order distortion removal automatic control means 701, the fifth-order distortion removal automatic control means 702, and the seventh-order distortion removal automatic control means 703. A tenth power combiner 210 for performing power composition with the other output of the fifteenth power divider 115 is inserted. Further, on the path leading to the fifteenth power divider 115 and the tenth power combiner, a tenth vector adjuster 310
And a ninth delay line 409 having a delay time of a path from the output of the fifteenth power divider 115 to the tenth power combiner 210 via the main amplifier 15.

A part of the output power is taken out by the thirteenth power divider 113, and the tenth power combiner 210 generates the tenth vector so as to have the same amplitude and opposite phase as the input signal of the main amplifier 15 which does not include the distortion signal. After the adjustment by the adjuster 310, the signal is synthesized with the input signal. Tenth vector adjuster 310
The main signal is automatically removed by the fourth main signal removal automatic control means 404 provided at the output of the tenth power combiner 210 and having the configuration shown in FIG. Therefore, the output of the tenth power combiner 210 has only the distortion component remaining after the main signal component of the output 12 has been removed.

Therefore, the distortion-compensated power amplifier according to the present embodiment comprises the third-order distortion removal automatic control means 701 and 5.
The automatic distortion removal control means 702 and the automatic removal control means 703 automatically remove the distortion signals of each order independently, as in the embodiment shown in FIG. Since no component is included or the power level of the main signal component is reduced, the detection capability is improved, and the distortion signals of each order can be independently removed stably.

<Embodiment 6> FIG. 6 is a block diagram showing another embodiment of the present invention. In the present embodiment, a third-order distortion removal block 501 from the power divider 101 to the power combiner 203 shown in FIG.
5th-order distortion removal block 502, 7th-order distortion removal block 5
03 and the like.
(Only the distortion removal blocks 501 to 503 of each order are omitted, and a known feed-forward distortion compensation power amplifier (for example, Japanese Patent Application Laid-Open No. 1-198809 discloses a feed-forward distortion compensation power amplifier.) It is a configuration combined with.

The input terminal 11 is connected to the fifteenth power
One of the outputs is passed through the fifth delay line 405 and the tenth vector adjuster 310, and is combined with a signal obtained by extracting a part of the output power by the thirteenth power divider 113 in the tenth power combiner 210. . 15th power distributor 11
5 is further divided into two by the sixteenth power divider 116, and one output of the sixteenth power divider 116 is input to the compensator 10 and the eleventh vector adjuster 31
1. The signal passes through the main amplifier 15 and is distributed to two systems in the fourteenth power distributor 114.

The other output of the sixteenth power divider 116 passes through the tenth delay line 410, and is connected to one of the eleventh power combiner 211 by the fourteenth power divider 114 via the fixed attenuator 802. The power is combined. The main signal component in the eleventh power combiner 211 has the same amplitude and opposite phase by the adjustment of the eleventh vector adjuster 311, so that the main signal component is removed. Here, the fixed attenuator 802 is
When the main signal component is removed by the power combiner 211, it is inserted to determine the gain so that the desired power is obtained at the output terminal 12.

The output of the eleventh power combiner 211 is
A part of the power is extracted by the power divider 218, and the extracted signal is detected by the fifth main signal removal automatic control means 605, subjected to arithmetic processing, and controls the eleventh vector adjuster 311. After passing through the twelfth vector adjuster 312, the other output of the eighteenth power divider is amplified by the error amplifier 16 that faithfully amplifies the signal component. In the twelfth power combiner 212, the output of the error amplifier 16 distributes the output of the main amplifier 15 and is combined with the other system of the fourteenth power divider 114 via the delay line 411.

In the twelfth power combiner 212, the power is combined with the same amplitude and opposite phase with respect to the distortion component, and the distortion component is removed. A thirteenth power divider 113 is provided at a stage subsequent to the twelfth power combiner 212, and a part of the output is taken out.
In the tenth power combiner 210, the thirteenth power splitter 1
At 13, a part of the output signal is taken out and combined with the signal through the fixed attenuator 801 and the signal adjusted by the tenth vector adjuster 310 so that the input signal has the same amplitude and opposite phase with respect to the main signal component. Removes the main signal component. Here, the fixed attenuator 801 changes the signal level input to the power combiner 210 via the vector adjuster 310 to the power combiner 210 via the power distributor 113.
Is inserted to adjust the signal level to be lower than the signal level input to the.

The output of the tenth power combiner 210 from which the main signal component has been removed is supplied to the third-order distortion removal automatic control means 701 and the fifth-order distortion removal automatic control similarly to the embodiment described with reference to FIG. Means 702 and automatic seventh-order distortion removal control means 70
3 and the fourth main signal removal automatic control means 604, and the same control is performed to remove the distortion signal.

Further, the output of the residual distortion removal automatic control means 704 having the same configuration as that of the third-order distortion removal automatic control means 701 to which the output of the tenth power combiner 210 is input is used as a twelfth vector adjuster for feedforward distortion compensation. Control 312 to remove distortion.

As described above, the distortion-compensated power amplifier according to the present embodiment increases the amount of removal of the distortion signal by combining it with the feed-forward type distortion compensation, and furthermore, stably suppresses the distortion signal of each order. Can be independently removed.

In FIG. 6, the distortion compensator 10 is provided on the path between the power divider 116 and the vector adjuster 311, but the distortion compensator 10 is provided between the vector adjuster 311 and the main amplifier 15. And the same effect can be obtained.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various design changes may be made without departing from the spirit of the present invention. It goes without saying that

[0065]

As is clear from the above-described embodiment, according to the distortion-compensated power amplifier of the present invention, control is performed to superimpose the distortion signal of each order, independent of the main signal, on the main signal. The accuracy of distortion removal can be improved by stably reducing the distortion signal of the main amplifier.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a block diagram showing another embodiment of the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing another embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a vector adjuster used in the distortion compensation power amplifier of the present invention.

FIG. 8 is a block diagram showing a configuration of main signal removal automatic control means used in the distortion compensation power amplifier of the present invention.

FIG. 9 is a block diagram showing a configuration of a third-order distortion removal automatic control means used in the distortion compensation power amplifier of the present invention.

FIG. 10 shows 5 used in the distortion compensation power amplifier of the present invention.
FIG. 4 is a block diagram showing a configuration of a next-order distortion removal automatic control unit.

FIG. 11 shows 7 used in the distortion compensation power amplifier of the present invention.
FIG. 4 is a block diagram showing a configuration of a next-order distortion removal automatic control unit.

FIGS. 12A to 12H are explanatory diagrams of distortion removal of the distortion-compensated power amplifier according to the present invention, and FIGS. 12A to 12H are spectrum diagrams at portions indicated by a to h in FIG.

FIG. 13 is a block diagram showing a conventional distortion-compensated power amplifier.

[Explanation of symbols]

Reference Signs List 10: distortion compensator, 11: signal input terminal, 12: signal output terminal, 15: main amplifier, 16: error amplifier, 21: first distortion generator, 22: second distortion generator, 23: third distortion generation 31: first distortion generation amount adjuster, 32: second distortion generation amount adjuster, 33: third distortion generation amount adjuster, 41: variable attenuator, 42: variable phase shifter, 43: detector, 51 ... Analog-to-digital converter, 52 ... Digital-to-analog converter, 53 ... Operation processing unit, 61 ... Frequency converter, 62 ... Frequency synthesizer, 63 ... Narrow band filter, 101 ... First power distributor, 102 ... Second power distribution Vessel, 103 ... third
Power splitter, 104: fourth power splitter, 105: fifth power splitter, 106: sixth power splitter, 107: seventh power splitter, 108: eighth power splitter, 109: ninth power splitter 110, 10th power splitter, 111, 11th power splitter, 112, 12th power splitter, 113, 13th power splitter, 114, 14th power splitter, 115, 15th
Power divider, 116 ... 16th power divider, 117 ... 1st
7 power splitter, 118 ... 18th power splitter, 201 ... first power splitter, 202 ... second power splitter, 203 ... third
Power splitter, 204: fourth power splitter, 205: fifth power splitter, 206: sixth power splitter, 207: seventh power splitter, 208: eighth power splitter, 209: ninth power splitter 210, a tenth power distributor, 211, an eleventh power distributor, 212, a twelfth power distributor, 301, a first vector regulator, 302, a second vector regulator, 303, a third vector regulator, 304: fourth vector adjuster, 30
5: fifth vector adjuster, 306: sixth vector adjuster, 307: seventh vector adjuster, 308: eighth vector adjuster, 309: ninth vector adjuster, 310: first
0 vector adjuster, 311 ... eleventh vector adjuster, 3
12 ... 12th vector adjuster, 401 ... 1st delay line, 4
02: second delay line, 403: third delay line, 404: fourth
Delay line, 405: fifth delay line, 406: sixth delay line, 4
07 ... seventh delay line, 408 ... eighth delay line, 409 ... ninth
Delay line, 410: tenth delay line, 411: eleventh delay line, 501: third-order distortion removal block, 502: fifth-order distortion removal block, 503: seventh-order distortion removal block, 601
.., First main signal removal automatic control means, 602, second main signal removal automatic control means, 603, third main signal removal automatic control means, 604, fourth main signal removal automatic control means, 605, fifth fifth signal removal Automatic control means, 701: Automatic third-order distortion removal control means, 702: Automatic fifth-order distortion removal control means, 703
... 7th-order distortion removal automatic control means, 704 ... residual distortion removal automatic control means, 801 ... first fixed attenuator, 802 ... second fixed attenuator, 901 ... first hybrid (power divider),
902: distortion generating circuit, 906: directional coupler, 907
... Detection circuit, 908... Distortion generation bias control circuit, 90
9: phase bias control circuit, 911: main amplifier, 912
... signal output.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Fumito Tomaru 32nd Miyukicho, Kodaira City, Tokyo Inside Hitachi Kokusai Electric Koganei Plant (72) Inventor Hiroki Sato 32nd Miyukicho, Kodaira City, Tokyo Hitachi, Ltd. Inside the Kokusai Electric Koganei Plant (72) Inventor Takuya Takahashi 32nd Miyukicho, Kodaira-shi, Tokyo Hitachi Kokusai Electric Koganei Plant F-term (reference) 5J090 AA01 AA41 CA21 FA19 GN02 GN07 KA00 KA15 KA16 KA23 KA34 KA41 KA55 KA68 MA14 SA13 TA01 TA03 5J091 AA01 AA41 CA21 FA19 KA00 KA15 KA16 KA23 KA34 KA41 KA55 KA68 MA14 SA13 TA01 TA03

Claims (5)

[Claims] 1. A power distribution means for distributing input power to outputs of three systems, a first distortion generating means for generating a first distortion signal from an output of one of the three outputs, A third-order distortion removing block including first distortion extracting means for extracting a third-order distortion signal from the first distortion signal, and first distortion adjusting means for adjusting the amplitude and phase of the extracted third-order distortion signal; Second distortion generating means for generating a second distortion signal from another one of the outputs of the three systems, and a fifth-order signal based on the second distortion signal and the extracted third-order distortion signal. A fifth-order distortion removing block that includes a second distortion extracting unit that extracts a distortion signal, and a second distortion adjusting unit that adjusts the amplitude and phase of the extracted fifth-order distortion signal; First delay means provided in the signal path of the output of the remaining one system , The output of the remaining one line through the delay means of the first,
Distortion compensation comprising: power combining means for combining the output of the third-order distortion removing block and the output of the fifth-order distortion removing block; and a main amplifier for amplifying the output of the power combining means to a predetermined power. A power amplifier, further comprising: a transmission time of a signal from an input terminal of the third-order distortion removing block to an input terminal of the power combining unit; and an input terminal of the power combining unit from the input terminal of the fifth-order distortion removing block. And second and third delay means connected to the respective removal blocks so that the transmission time of the signal until the first signal is equal to the first signal. A delay time corresponding to a transmission time of a signal to an input terminal of the power combining means via a third-order and fifth-order distortion removing block, respectively, wherein the first and second distortion adjusting means are respectively provided by the main amplifier; The amplitude and phase of the output of each of the third and fifth distortion removal blocks is adjusted so that the third and fifth distortion components of the distortion signal generated when amplifying the main signal are reduced. Distortion compensating power amplifier. 2. A power distribution means for distributing input power to four outputs, a first distortion generation means for generating a first distortion signal from an output of one of the four outputs, and A third-order distortion removing block including first distortion extracting means for extracting a third-order distortion signal from one distortion signal and first distortion adjusting means for adjusting the amplitude and phase of the extracted third-order distortion signal; A second distortion generating means for generating a second distortion signal from another one of the outputs of the system, and a fifth-order distortion signal from the second distortion signal and the extracted third-order distortion signal. A fifth-order distortion removing block including second distortion extracting means for extracting and a second distortion adjusting means for adjusting the amplitude and phase of the extracted fifth-order distortion signal; and another one of the outputs of the four systems Third distortion for generating a third distortion signal from the output of the system The raw unit 3
A third distortion extracting unit for extracting a seventh-order distortion signal from the distortion signal and the extracted fifth-order distortion signal, and a third distortion adjusting unit for adjusting the amplitude and phase of the extracted seventh-order distortion signal. A seventh-order distortion removing block, and the remaining one of the outputs of the four systems of the power distribution means.
It is provided in the signal path of the output of the system and corresponds to the transmission time of the signal from the output end of the power distribution means to the input end of the power synthesis means via the third, fifth and seventh order distortion removal blocks, respectively. A first delay unit having a delay time, an output of the remaining one system via the first delay unit, an output of the third-order distortion removal block, an output of the fifth-order distortion removal block, and the seventh-order distortion A distortion compensating power amplifier comprising: a power combining unit that combines an output of the removing unit; and a main amplifier that amplifies an output of the power combining unit to a predetermined power. The signal transmission time from the input terminal of the power combining means to the input terminal of the power combining means, the signal transmission time from the input terminal of the fifth-order distortion removing block to the input terminal of the power combining means, and the seventh-order distortion removing block. And second, third, and fourth delay means connected to the respective removal blocks so that the signal transmission time from the input terminal of the power combining means to the input terminal of the power combining means is equal; , The second and the third distortion adjusting means are each provided with three of the distortion signals generated when the main signal is amplified by the main amplifier.
Next, to reduce the fifth, seventh, and seventh order distortion components, the third,
A distortion-compensated power amplifier for adjusting the amplitude and phase of the output of each of the fifth-order and seventh-order distortion removal blocks. 3. A main signal for extracting a part of the output of each distortion extracting means into each of the order distortion removing blocks and controlling the main signal component of each distortion extracting means based on the extracted electric power so as to minimize the main signal component. 3. The distortion-compensated power amplifier according to claim 1, further comprising automatic removal control means. 4. A means for extracting a part of a signal at a stage subsequent to the main amplifier, a distortion detecting means for performing frequency conversion and detection for selecting each order of distortion from the extracted signal, and an output of the distortion detecting means. A distortion removal automatic control means for controlling the distortion adjustment means in each of the distortion removal blocks based on the
4. The distortion-compensated power amplifier according to claim 1, wherein said distortion removal automatic control means controls said distortion adjustment means such that a detection value of said distortion detection means is minimized. 5. A first power distribution means for distributing input power to outputs of two systems, and a first vector adjustment means for adjusting an amplitude and a phase of an output of one of the first power distribution means. A main amplifier that amplifies the output of the one system via the first vector adjustment unit; a second power distribution unit that distributes the output of the main amplifier to two system outputs; First combining means for combining the output of one system of the power distribution means and the output of the other system of the first power distribution means; and adjusting the amplitude and phase of the output of the first combining means. A second vector adjustment unit; an error amplifier that amplifies an output signal of the first combining unit via the second vector adjustment unit; and an output signal of the error amplifier and the other of the second power distribution unit. And the output signal of the main amplifier through the system
A distortion compensator provided on a path of an input terminal of the first vector adjustment unit or an input terminal of the main amplifier, wherein the distortion compensator transmits four inputs to the distortion compensator; Third power distribution means for distributing the first distortion signal to an output of the first system, first distortion generating means for generating a first distortion signal from one of the outputs of the four systems, and tertiary distortion from the first distortion signal. The first distortion extracting means for extracting the distortion signal and the amplitude and phase of the extracted third-order distortion signal are adjusted so as to reduce the third-order distortion component of the distortion signal generated when the main amplifier amplifies the signal. 3 comprising the first distortion adjusting means
A second-order distortion removing block, second distortion generating means for generating a second distortion signal from another one of the four outputs, and the second distortion signal and the extracted third-order distortion Second distortion extracting means for extracting a fifth-order distortion signal from the signal and reducing the fifth-order distortion component of the distortion signal generated when the main amplifier amplifies the signal with the amplitude and phase of the extracted fifth-order distortion signal A fifth-order distortion removing block including a second distortion adjusting unit that adjusts the distortion, and a third distortion generating unit that generates a third distortion signal from another one of the four outputs. And the third
A third distortion extracting means for extracting a seventh-order distortion signal from the distortion signal and the extracted fifth-order distortion signal, and determining the amplitude and phase of the extracted seventh-order distortion signal when the main amplifier amplifies the signal. A seventh-order distortion removing block including a third-distortion adjusting unit for adjusting so as to reduce a seventh-order distortion component of the generated distortion signal; and a remaining one of the outputs of the four systems of the power distribution unit.
A signal output path of a system is provided, and a transmission time of a signal from an output terminal of the power distribution unit to an input terminal of the third power combining unit via the third-order, fifth-order, and seventh-order distortion removal blocks is provided. A first delay unit having a corresponding delay time; an output of the remaining one system via the first delay unit; an output of the third-order distortion removal block; an output of the fifth-order distortion removal block; A third power combining means for combining the output of the next-order distortion removal block, and a signal output path of the remaining one of the four outputs, and A first delay unit having a delay time corresponding to a signal transmission time to an input terminal of the third power combining unit via the third-order, fifth-order, and seventh-order distortion removal blocks; Insert next-order distortion removal block A signal transmission time from an input to an input terminal of the power combining means, a signal transmission time from an input terminal of the fifth-order distortion removing block to an input terminal of the power combining means, and an input of the seventh-order distortion removing block. Distortions comprising second, third and fourth delay means connected to respective removal blocks so that the signal transmission time from the end to the input end of the power combining means is equal. Compensated power amplifier.