JP2003229727A - Nonlinear distortion compensation circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonlinear distortion compensating circuit that can fully suppress the nonlinear distortion of a high-frequency amplifier circuit to be compensated, while maintaining high efficiency. <P>SOLUTION: This nonlinear distortion compensating circuit 1, which compensates the nonlinear distortion of the high-frequency amplifier circuit to be compensated generates tertiary to N-nary distortion signals ε3-εN, which can be compensated respectively for tertiary to N-nary mixed modulation distortion caused as nonlinear distortions based on a high-frequency signal Si. At the same time, the circuit 1 composites generated distortion signals from tertiary distortion signals ε3 to N-nary distortion signals εN with the high-frequency signal Si and outputs the composite signals as output signals So. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-linear distortion compensating circuit for compensating for non-linear distortion caused by non-linear characteristics of input / output characteristics in a compensated high frequency amplifier circuit.

[0002]

2. Description of the Related Art As this type of non-linear distortion compensating circuit, a non-linear distortion compensating circuit based on the predistortion method disclosed in Japanese Patent Publication No. 7-101820 and Japanese Patent Publication No. 8-15245 is known. FIG. 6 shows a basic configuration of a high-frequency power amplifier device 61 including the non-linear distortion compensation circuit based on the predistortion method.
As shown in the figure, the high frequency power amplification device 61 is configured to include a non-linear distortion compensation circuit 41 and a high frequency amplification circuit 51 as a compensated high frequency amplification circuit. In this case, the non-linear distortion compensation circuit 41 is connected to the preceding stage of the high frequency amplification circuit 51, and the distortion signal ε for removing the third-order intermodulation distortion generated when the high frequency signal Si is amplified by the high frequency amplification circuit 51. Is added to the high-frequency signal Si in advance to reduce high-order intermodulation distortion of the output signal So output from the high-frequency amplifier circuit 51.

In this high frequency power amplifier 61, in principle, when the non-linear distortion compensating circuit 41 inputs the high frequency signal Si whose signal component and its voltage are represented by "Si", the signal component and its voltage. Generates a distortion signal ε represented by a voltage “ε” therein, and outputs a drive signal Sd whose signal component and its voltage are represented by “(Si + ε)”. Next, the high frequency amplifier circuit 51 outputs the drive signal S
Amplify d with a predetermined gain G. In this case, when the signal component of the distortion signal δ generated inside the high frequency amplifier circuit 51 and its voltage are represented by “δ”, the high frequency amplifier circuit 51 indicates that the signal component and its voltage are “(G · (Si + ε) + δ ) "
The output signal So represented by is output. Therefore, when the signal component of the distortion signal ε and its voltage generated by the non-linear distortion compensation circuit 41 are represented by “(δ / G)”, that is, “ε” and “δ” have opposite phases, and When the absolute value of the voltage satisfies the relational expression (ε = δ / G) (hereinafter, simply,
Also referred to as “compensation condition”), the high-frequency amplifier circuit 51 outputs the output signal So whose signal component and voltage are represented by “G · Si”.
Is output. Therefore, when the above compensation condition is satisfied for all the high frequency signals Si, the non-linear distortion component of the output signal So output by the high frequency amplification circuit 51 is compensated and suppressed.

Specifically, as shown in FIG. 7, the non-linear distortion compensating circuit 41 comprises a power distributor 42, a distortion generating circuit 43, linear circuits 44 and 45, and power combiners 46 and 47. There is. In the non-linear distortion compensating circuit 41, the power distributor 42 divides the high frequency signal Si into three and outputs the high frequency signal Si to the distortion generating circuit 43, the linear circuit 44 and the linear circuit 45. Next, the distortion generating circuit 43 amplifies the distributed high-frequency signal Si with a predetermined gain, generates a distortion signal ε, and outputs it as a signal S11. In this case, the signal component and voltage of the signal S11 are represented by “(Si + ε)”. At the same time, the linear circuit 44 linearly amplifies the distributed high frequency signal Si with a predetermined gain and outputs it as a signal S12. In this case, the signal component and voltage of the signal S12 are represented by “Si”. Then, the power combiner 46 subtracts the signal S11 from the signal S12. As a result, the high frequency signal Si is canceled out, and the power combiner 46 outputs the anti-phase distortion signal ε to the signal S13.
Output as. On the other hand, the linear circuit 45 also linearly amplifies the distributed high frequency signal Si with a predetermined gain and outputs it as a signal S14. In this case, the signal component and voltage of the signal S14 are represented by "Si". Next, the power combiner 47 adds the signal S13 and the signal S14 to generate the drive signal Sd whose signal component and voltage are represented by “(Si + ε)”. Therefore, when the voltage level (amplitude) of the high frequency signal Si, the frequency of the high frequency signal Si, the temperature, etc. are used as parameters, the non-linear distortion compensation circuit 41 causes the drive signal Sd to be generated regardless of variations in these parameters.
Is output, the high-order intermodulation distortion of the output signal So output by the high frequency amplifier circuit 51 is compensated and suppressed.

[0005]

However, the non-linear distortion compensating circuit 41 has the following problems. That is,
In today's world where transmission signals have a wider band, the high frequency amplifier circuit 5
1 is required to further suppress higher-order intermodulation distortion included in the output signal So transmitted by 1. On the other hand,
In the conventional non-linear distortion compensation circuit 41, the high frequency amplification circuit 51
In order to suppress the third-order intermodulation distortion that occurs inside the high-frequency signal S
The distortion signal ε is added to i. Therefore, in the high-frequency power amplifier device 61 using the conventional non-linear distortion compensation circuit 41,
Even if the third-order intermodulation distortion can be suppressed, the fifth-order intermodulation distortion or 7
The current situation is that higher order intermodulation distortion such as second order intermodulation distortion cannot be removed. Therefore, in the past, in order to suppress higher order intermodulation distortion, the high frequency amplifier circuit 5
A large amount of current is supplied to linearly amplify the power amplifier provided inside the power supply unit 1, and bias adjustment and matching adjustment of the power amplifier are performed by cut-and-try. However, even if these methods are used, for example, although the fifth-order intermodulation distortion can be suppressed, the seventh-order intermodulation distortion can be increased or the seventh-order intermodulation distortion can be suppressed. It is very difficult to uniformly suppress all higher-order cross-modulation distortion, such as an increase in fifth-order cross-modulation distortion. In addition, when these methods are adopted, there are problems such as a decrease in efficiency due to an increase in current consumption and a rise in device cost due to a rise in adjustment cost.

The present invention has been made in view of the above problems, and a main object of the present invention is to provide a nonlinear distortion compensating circuit capable of sufficiently suppressing the nonlinear distortion of a compensated high frequency amplifier circuit while maintaining high efficiency. And

[0007]

To achieve the above object, a non-linear distortion compensating circuit according to the present invention is a non-linear distortion compensating circuit for compensating for non-linear distortion of a compensated high frequency amplifier circuit. N-order intermodulation distortion (where N is a natural number 3 and any one or an arbitrary plurality of odd numbers of 5 or more) is generated based on the input high-frequency signal. At the same time, the generated Nth-order distortion signal and the input high-frequency signal are combined and output as an output signal.

In this case, a plurality of distortion generation circuits for respectively generating the N-th order distortion signals based on the input high-frequency signals, a linear circuit for linearly amplifying the input high-frequency signals, and the generated N-th order distortion signals. An output combining circuit is preferably provided for combining the signal and the linearly amplified input high frequency signal to generate the output signal.

Further, a linear circuit for linearly amplifying the input high frequency signal, a third order distortion generating circuit for inputting the input high frequency signal to generate a third order distortion signal, and a third order distortion for inputting the input high frequency signal. A first distribution for distributing the output signal of the third-order distortion generation circuit, and a fifth-order distortion generation circuit for generating a signal and a fifth-order distortion signal, and an output combination circuit for generating the output signal. And a second distributor for distributing the output signal of the fifth-order distortion generation circuit, and the fifth-order by subtracting the distribution signal distributed by the first distributor from the distribution signal distributed by the second distributor. A first combiner for generating a distorted signal, and the three distributors distributed by the first distributor
And a second combiner that combines the next-distortion signal, the fifth-order distortion signal generated by the first combiner, and the linearly amplified input high-frequency signal and outputs the combined signal as the output signal. Is preferred.

Further, a vector amount adjusting circuit for third-order distortion configured to be able to adjust the vector amount of the output signal output by the third-order distortion generating circuit, and the output output by the fifth-order distortion generating circuit. It is preferable to include a fifth-order distortion vector amount adjusting circuit configured to adjust the vector amount of the signal.

A first vector amount adjusting circuit configured to adjust the vector amount of the third-order distortion signal distributed by the first distributor, and the fifth-order distortion generated by the first combiner. It is preferable to include a second vector amount adjusting circuit configured to be able to adjust the vector amount of the signal.

At least one of the frequency of the input high-frequency signal, the power of the input high-frequency signal, the temperature inside or near the nonlinear distortion compensation circuit, and the temperature inside or near the compensated high-frequency amplifier circuit is detected. And a memory for storing the adjustment amounts of the third-order distortion vector amount adjusting circuit and the fifth-order distortion vector amount adjusting circuit in association with the detection signal detected by the detector, A control circuit that reads out each of the adjustment amounts corresponding to the detection signal from the memory and controls the read out adjustment amounts corresponding to the third-order distortion vector amount adjustment circuit and the fifth-order distortion vector amount adjustment circuit. And preferably.

Further, the first distortion is reduced so that the nonlinear distortion contained in the output signal of the compensated high frequency amplifier circuit is reduced.
It is preferable to include a control circuit for controlling the adjustment amount of the vector amount adjustment circuit and the adjustment amount of the second vector amount adjustment circuit.

Further, it is preferable that each of the vector amount adjusting circuits is configured to be capable of adjusting the attenuation amount and the phase amount of the corresponding distortion signal.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a nonlinear distortion compensation circuit according to the present invention will be described below with reference to the accompanying drawings. The high-frequency amplifier circuit connected to the subsequent stage of the non-linear distortion compensating circuit according to the present invention has the same configuration as the conventional high-frequency amplifier circuit 51, and thus the duplicated description will be omitted. In addition, the same components and signals as those described above are designated by the same reference numerals, and redundant description will be omitted.

First, the basic configuration of the non-linear distortion compensation circuit 1 will be described with reference to the block diagram shown in FIG. The non-linear distortion compensating circuit 1 pre-distorts non-linear distortions from third-order cross-modulation distortion to N-th order cross-modulation distortion that occur during power amplification by a high-frequency amplifier circuit 51 (not shown) as a compensated high-frequency amplifier circuit. The Nth-order distortion signal εN (N is an odd number of 3 or more and a predetermined number or less, hereinafter also referred to as “distortion signal ε” when not distinguished) that can be compensated by the method is a high-frequency signal Si (input high-frequency signal in the present invention). It is configured to be able to generate based on. Specifically, the non-linear distortion compensating circuit 1 distributes the high frequency signal Si to the distribution signals S1-1 and S1.
1-3, ... S1-N (Hereinafter, when no distinction is made,
The input distributor 2 that distributes the “distribution signal S1”) is provided. The non-linear distortion compensating circuit 1 also includes a third-order distortion generating circuit 3-3 that generates a third-order distortion signal ε3 (hereinafter, also referred to as “distortion generating circuit 3” when no distinction is made including each distortion generating circuit described later). And a third-order distortion vector amount adjusting circuit 4-3 that adjusts the vector amount of the third-order distortion signal ε3 (hereinafter, when not including the respective distortion vector amount adjusting circuits described later, “vector amount adjusting circuit 4”). (Also referred to as). Note that, hereinafter, the pair of M-th order (M is an odd number of 3 or more and N or less) distortion generation circuit 3 and the M-th order distortion vector amount adjustment circuit 4 are also collectively simply referred to as “M-th order distortion generation series”. Further, the non-linear distortion compensating circuit 1 is provided with distortion generating sequences from the 5th order to the Nth order.

Further, the nonlinear distortion compensating circuit 1 uses the distribution signal S
A linear circuit 5 that linearly amplifies 1-1 to the power level of the high-frequency signal Si, a third-order distortion signal ε3 to an N-th order distortion signal εN output from each vector amount adjusting circuit 4, and a high-frequency output from the linear circuit 5. The output synthesizing circuit 6 synthesizes the signal Si and outputs the drive signal Sd corresponding to the output signal in the present invention.

Next, the operating principle of the non-linear distortion compensation circuit 1 will be described.

In this non-linear distortion compensating circuit 1, the input distributor 2 distributes the high frequency signal Si to the linear circuit 5 and the distortion generating circuits 3-3 to 3-N to distribute signals S1-1 to S1-N.
Is output. Next, the third-order distortion generation circuit 3-3 generates the third-order distortion signal ε3 for compensating the third-order cross modulation distortion, and the fifth-order distortion generation circuit 3-5 for compensating the fifth-order cross modulation distortion. The fifth-order distortion signal ε5 is generated, and similarly, the higher-order distortion signal ε for compensating the higher-order intermodulation distortion corresponding to the other distortion generation circuits 3 up to the Nth order is generated. As a result, third-order distortion signals ε3 to N-th order distortion signals εN for compensating for third-order to Nth-order high-order intermodulation distortions are generated. On the other hand, the linear circuit 5 linearly amplifies the distribution signal S1-1 to a voltage level equal to that of the high frequency signal Si, for example. Then, as shown in FIG. 2, the output synthesizing circuit 6 synthesizes the drive signal S with the high-frequency signal Si and the distortion signals ε from the third distortion signal ε3 to the Nth distortion signal εN.
Output d. In this case, in FIG.
The high-frequency amplifier circuit 5 whose voltage phase of the Nth-order distortion signal εN is described later
In order to easily understand that the voltage phase of the high-order intermodulation distortion generated due to the amplification by 1 is inverted, the signal component of the high-frequency signal Si is expressed in a positive direction and the third-order distortion signal ε is represented.
The signal component of the 3rd to Nth-order distortion signal εN is represented in a negative direction.

Next, the high frequency amplifier circuit 51 inputs the drive signal Sd and amplifies the power with a gain G. At this time, the high frequency amplifier circuit 51 adds the third-order distortion signal ε to the drive signal Sd.
Assuming that the 3rd to Nth distortion signals εN are not included, FIG.
As shown in, an output signal So whose signal component is represented by (G · Sd + δ) is generated. In this case, the distortion signal δ is the third-order distortion signal ε3 ′, the fifth-order distortion signal ε5 ′, ...
It means a composite signal of the Nth distortion signal εN ′. Therefore,
In order to satisfy the above compensation condition (ε = δ / G), 3
Next distortion signal ε3, 5th distortion signal ε5, 7th distortion signal ε7, ...
, The voltage level obtained by multiplying each voltage level of the Nth distortion signal εN by the gain G, the third distortion signal ε3 ′, the fifth distortion signal ε5 ′, and the seventh distortion signal ε generated in the high frequency amplifier circuit 51.
7 ′, ..., When the respective voltage levels of the Nth-order distortion signal εN ′ are equal to each other and their phases are inverted, the third-order distortion signal ε3 compensates and suppresses the third-order distortion signal ε3 ′, Similarly, the fifth-order distortion signal ε5 causes the fifth-order distortion signal ε
5'is compensated and suppressed, and 7'by the 7th distortion signal ε7.
The next distortion signal ε7 'is compensated and suppressed, and the Nth distortion signal εN is compensated and suppressed by the Nth distortion signal εN. As a result, when the drive signal Sd output from the non-linear distortion compensation circuit 1 is input to the high frequency amplification circuit 51, theoretically, each high-order intermodulation distortion is suppressed as shown in FIG. , The high frequency amplifier circuit 51, the high frequency signal S
An output signal So consisting of only the signal component of i is output.

As described above, according to the non-linear distortion compensating circuit 1, the distortion signals ε from the third-order distortion signal ε3 to the N-th order distortion signal εN and the high-frequency signal Si are combined by the predistortion method to improve the efficiency. The high-frequency amplifier circuit 5 does not cause a decrease and a rise in the device cost due to the adjustment cost.
It is possible to uniformly and sufficiently suppress high-order intermodulation distortion that occurs when 1 amplifies the high frequency signal Si.

Next, referring to FIG. 5, a high frequency amplifier circuit 5
As the high-order cross-modulation distortion generated in 1, the third-order cross-modulation distortion ε3, the fifth-order distortion signal ε5, and the seventh-order distortion signal ε7 for suppressing the fifth-order cross-modulation distortion and the seventh-order cross-modulation distortion are A specific configuration example of the non-linear distortion compensation circuit 1 that is combined with the high frequency signal Si will be described. The same components as those described above are designated by the same reference numerals, and a duplicate description will be omitted.

As shown in the figure, the nonlinear distortion compensation circuit 1
Is an input distributor 2 composed of a transformer or the like, a third-order distortion generation circuit 3-3 that generates a third-order distortion signal ε3, and a fifth-order distortion generation circuit 3-5 or 7th order that generates a fifth-order distortion signal ε5. Distortion signal ε7
7th-order distortion generation circuit 3-7 for generating the third-order distortion signal ε3 for adjusting the vector quantity of the third-order distortion signal ε3, and for adjusting the vector quantity of the fifth-order distortion signal ε5 5th-order distortion vector amount adjusting circuit 4-5, 7th-order distortion vector amount adjusting circuit 4-7 for adjusting the vector amount of the 7th-order distortion signal ε7, output combining circuit 6, power value and frequency of the high-frequency signal Si P / F detector (detector) 11 for detecting temperature, for example, a temperature sensor (detector) 12 for detecting the internal temperature of the non-linear distortion compensation circuit 1, a CPU (control circuit) 13, a ROM
A (memory) 14 and a distortion detector 15 are provided. As the temperature sensor 12, the temperature inside or in the vicinity of the non-linear distortion compensation circuit 1 and the high frequency amplification circuit 5 are used.
At least one of the temperatures inside or in the vicinity of 1 can be configured to be detectable.

Third-order distortion generation circuit 3-3, fifth-order distortion generation circuit 3
-5 and 7th-order distortion generation circuits 3-7 have the same configuration,
It comprises a distributor 21, a variable amplifier 22, a variable attenuator 23, an amplifier 24, a variable phase shifter 25 and a combiner 26. In this case, the distributor 21 outputs the distribution signal S1 to 2
It distributes and outputs to the variable amplifier 22 and the amplifier 24.
The variable amplifier 22 amplifies the distribution signal S1 with a gain according to the gain control signal SG3 (or SG5, SG7, hereinafter, also referred to as "gain control signal SG" when no distinction is made) output from the CPU 13. The variable amplifier 22 of the third-order distortion generation circuit 3-3 non-linearly amplifies the distribution signal S1 with a gain larger than that of the amplifier 24, and outputs the third-order distortion signal ε3 together with the amplified high-frequency signal Si. On the other hand, the variable amplifier 22 of the fifth-order distortion generation circuit 3-5 non-linearly amplifies the distribution signal S1 with a gain larger than the gain of the amplifier 24 and, together with the amplified high-frequency signal Si, the third-order distortion signal ε3 and the fifth-order distortion signal. Output ε5. The variable amplifier 22 of the 7th-order distortion generation circuit 3-7 nonlinearly amplifies the distribution signal S1 with a gain larger than that of the amplifier 24, and amplifies the high-frequency signal S.
The third-order distortion signal ε3, the fifth-order distortion signal ε5, and the seventh-order distortion signal ε7 are output together with i. The variable attenuator 23 outputs the attenuation amount control signal SA3 (or SA5, SA7,
Hereinafter, when no distinction is made, the distribution signal S1 amplified by the variable amplifier 22 is attenuated by an attenuation amount according to the "attenuation amount control signal SA") and the same as the high frequency signal Si output by the variable phase shifter 25. The high frequency signal Si of electric power is output. The amplifier 24 has a fixed gain and a distribution signal S.
1 is linearly amplified. The variable phase shifter 25 is amplified by the amplifier 24 with a phase amount according to the phase amount control signal SP3 (or SP5, SP7, hereinafter, also referred to as "phase amount control signal SP" when no distinction is made) output from the CPU 13. The phase of the high frequency signal Si is shifted. The combiner 26 subtracts the distribution signal S1 output by the variable attenuator 23 from the distribution signal S1 output by the variable phase shifter 25 to generate and output a high frequency signal S2-3 as a third-order distortion signal ε3. .

In the third-order distortion generating circuit 3-3, the variable amplifier 22 uses the high frequency signal S distributed by the distributor 21.
i is amplified with a gain according to the gain control signal SG3 to generate a third-order distortion signal ε3 having a voltage level according to the nonlinear input / output characteristics, and the third-order distortion signal ε3 is variably attenuated together with the amplified high-frequency signal Si. Output to the container 23. Further, the variable attenuator 23 attenuates the output signal of the variable amplifier 22 with an attenuation amount according to the attenuation amount control signal SA3 and outputs the attenuated signal to one input terminal of the combiner 26. On the other hand, the amplifier 24 linearly amplifies the high frequency signal Si with a predetermined fixed gain and outputs the high frequency signal Si to the variable phase shifter 25, and the variable phase shifter 25 outputs the output signal of the amplifier 24 with the phase amount according to the phase amount control signal SP3. The high frequency signal Si) is phase-shifted and output to the other input terminal of the combiner 26. Further, the combiner 26 subtracts the high frequency signal Si and the third-order distortion signal ε3 input to one input terminal from the high frequency signal Si input to the other input terminal. In this case, the variable attenuator 23 adjusts the power of the high frequency signal Si input to one input terminal, and the variable phase shifter 25 adjusts the phase of the high frequency signal Si input to the other input terminal. The high frequency signal Si input to one input terminal and the high frequency signal Si input to the other input terminal are reliably canceled. Therefore, the synthesizer 26 determines only the opposite-phase third-order distortion signal ε3 as the high-frequency signal S2-3 (hereinafter, also referred to as “high-frequency signal S2” when the high-frequency signals S2-5 and S2-7 are not distinguished from each other). Output.

Further, in the fifth-order distortion generating circuit 3-5, the variable amplifier 22 amplifies the high frequency signal Si distributed by the distributor 21 with a gain corresponding to the gain control signal SG5 to obtain its nonlinear input / output characteristic. The third-order distortion signal ε3 of the corresponding voltage level
And the fifth-order distortion signal ε5, and the third-order distortion signal ε3 and the fifth-order distortion signal ε5 together with the amplified high-frequency signal Si.
Is output to the variable attenuator 23. In addition, the variable attenuator 23
Is the variable amplifier 2 with the attenuation amount according to the attenuation amount control signal SA5.
The output signal of 2 is attenuated and output to one input terminal of the combiner 26. On the other hand, the amplifier 24 linearly amplifies the high frequency signal Si with a predetermined fixed gain and outputs it to the combiner 26, and the variable phase shifter 25 outputs the output signal (high frequency signal) of the amplifier 24 with a phase amount according to the phase amount control signal SP5. The signal Si) is phase-shifted and output to the other input terminal of the combiner 26. Also, the synthesizer 2
6 subtracts the high-frequency signal Si input to one input terminal, the third-order distortion signal ε3, and the fifth-order distortion signal ε5 from the high-frequency signal Si input to the other input terminal. In this case, the variable attenuator 23 adjusts the power of the high frequency signal Si input to one of the input terminals, and the variable phase shifter 2
High-frequency signal Si input to the other input terminal by 5
Since the phase is adjusted, the high frequency signal Si input to one input terminal and the high frequency signal Si input to the other input terminal are reliably canceled. Therefore, the synthesizer 26
Outputs only the opposite-phase third-order distortion signal ε3 and fifth-order distortion signal ε5 as the high-frequency signal S2-5.

Further, in the 7th-order distortion generating circuit 3-7, the variable amplifier 22 amplifies the high frequency signal Si distributed by the distributor 21 with a gain corresponding to the gain control signal SG7 to obtain its nonlinear input / output characteristic. Third-order distortion signal ε of the corresponding voltage level
The third and fifth order distortion signals ε5 and the seventh order distortion signal ε7 are generated, and the third order distortion signal ε3 is generated together with the amplified high frequency signal Si.
The variable attenuator 23 receives the fifth-order distortion signal ε5 and the seventh-order distortion signal ε7.
Output to. Further, the variable attenuator 23 attenuates the output signal of the variable amplifier 22 with an attenuation amount according to the attenuation amount control signal SA7 and outputs it to one input terminal of the combiner 26. on the other hand,
The amplifier 24 linearly amplifies the high frequency signal Si with a predetermined fixed gain and outputs it to the variable phase shifter 25.
The output signal (high-frequency signal Si) of the amplifier 24 is phase-shifted by the phase amount according to the phase amount control signal SP7 and output to the other input terminal of the synthesizer 26. Further, the combiner 26 extracts the high-frequency signal Si input to one input terminal from the high-frequency signal Si input to the other input terminal, the third-order distortion signal ε3, the fifth-order distortion signal ε5, and the seventh-order distortion signal ε7. Subtract. In this case, the variable attenuator 23 adjusts the power of the high frequency signal Si input to one of the input terminals, and the variable phase shifter 2
High-frequency signal Si input to the other input terminal by 5
Since the phase is adjusted, the high frequency signal Si input to one input terminal and the high frequency signal Si input to the other input terminal are reliably canceled. Therefore, the synthesizer 26
Outputs only the opposite-phase third-order distortion signal ε3, fifth-order distortion signal ε5, and seventh-order distortion signal ε7 as the high-frequency signal S2-7.

The third-order distortion vector amount adjusting circuit 4-3 has a C
According to the vector amount control signal SV3 output from the PU 13, the phase of the high frequency signal S2-3 is phase-shifted and the attenuation amount is changed as necessary to output the third-order distortion signal ε3 as the high frequency signal S2-3. . The fifth-order distortion vector amount adjusting circuit 4-5 shifts the phase of the high-frequency signal S2-5 according to the vector amount control signal SV5 output from the CPU 13 and changes the attenuation amount as necessary to change the phase amount to 3 Next distortion signal ε3
And the fifth-order distortion signal ε5 is output as a high-frequency signal S2-5. The 7th-order distortion vector amount adjusting circuit 4-7 includes the CPU 1
The phase of the high-frequency signal S2-7 is shifted in accordance with the vector amount control signal SV7 (hereinafter, also referred to as "vector amount control signal SV" when the vector amount control signals SV3 to SV7 are not distinguished from each other) output from No. 3). In addition, if necessary, the amount of attenuation is varied to change the third-order distortion signal ε3 and the fifth-order distortion signals ε5 and 7
The next distortion signal ε7 is output as the high frequency signal S2-7.

The output synthesizing circuit 6 divides the high-frequency signal S2-3 output from the third-order distortion vector amount adjusting circuit 4-3 into two parts (first distributor in the present invention) 31-3.
And a distributor (second distributor in the present invention) 31-5 for dividing the high frequency signal S2-5 output from the fifth-order distortion vector amount adjusting circuit 4-5, and a seventh-order distortion vector amount adjusting circuit. A divider 31-7 that divides the high frequency signal S2-7 output from 4-7 into two, combiners 32 and 33, vector amount adjusting circuits 34-3, 34-5, 34-7, and a combiner 35.
And a distributor 36. in this case,
The combiner 32 corresponds to the first combiner in the present invention, and is the high frequency signal S2-3 distributed by the distributor 31-3.
(That is, the third-order distortion signal ε3) and the high-frequency signal S2-5 distributed by the distributor 31-5 (that is, the third-order distortion signal ε3 and the fifth-order distortion signal ε5) are input, and the phase-inverted high-frequency signal S2 is input. -3 and the high frequency signal S2-5 are combined, that is, the high frequency signal S2-3 is subtracted from the high frequency signal S2-5 to generate the fifth-order distortion signal ε5. The combiner 33 corresponds to the second combiner in the present invention, and is the high frequency signal S2 distributed by the distributor 31-5.
-5 and the high frequency signal S distributed by the distributor 31-7
2-7 (that is, the third-order distortion signal ε3, the fifth-order distortion signal ε5, and the seventh-order distortion signal ε7) is input, and the high-frequency signal S2-5 and the high-frequency signal S2-7 whose phases are inverted are combined. , That is, from the high frequency signal S2-7 to the high frequency signal S2
A −7th distortion signal ε7 is generated by subtracting −5.

The vector amount adjusting circuit 34-3 corresponds to the first vector amount adjusting circuit in the present invention, and is a CPU.
Vector amount control signal SVO3 output from 13 (hereinafter,
When the vector quantity control signals SVO5 to SVO7 are not distinguished from each other, the vector quantity control signals SVO5 to SVO7 are also referred to as "vector quantity control signal SVO").
The phase of the high-frequency signal S2-3 (that is, the third-order distortion signal ε3) is phase-shifted and the attenuation amount is changed as necessary, and the third-order distortion signal ε3 is output to the combiner 35. The vector amount adjusting circuit 34-5 corresponds to the second vector amount adjusting circuit in the present invention, and shifts the phase of the fifth-order distortion signal ε5 in accordance with the vector amount control signal SVO5 output from the CPU 13 and is necessary. The attenuation amount is varied accordingly and the fifth-order distortion signal ε5 is output to the combiner 35. The vector amount adjustment circuit 34-7 is
In accordance with the vector amount control signal SVO7 output from the CPU 13, the phase of the 7th-order distortion signal ε7 is phase-shifted and the attenuation amount is changed as necessary to synthesize the 7th-order distortion signal ε7.
Output to. It should be noted that one of the high frequency signals S2-7 output from the distributor 31-7 is input to a combiner (not shown) required when the 9th distortion generation sequence is arranged, and the 9th order When the distortion generation series is not provided, the distributor 31
It is terminated by a termination resistor having the same resistance value as the output impedance of -7.

The combiner 35 inputs the high-frequency signal Si linearly amplified by the linear circuit 5, the third-order distortion signal ε3, the fifth-order distortion signal ε5, and the seventh-order distortion signal ε7, and synthesizes the drive signal Sd (that is, (Si + ε3 + ε5 + ε
7)) is generated and output. The distributor 36 is composed of, for example, a directional coupler, and outputs a part of the drive signal Sd to the distortion detector 15.

Further, the ROM 14 corresponds to each combination of each power value and each frequency of the high frequency signal Si and the detected temperature detected by the temperature sensor 12, each variable amplifier 22 in each distortion generating circuit 3, A gain control amount, an attenuation control amount, and a phase control amount for the variable attenuator 23 and the variable phase shifter 25, and a vector control amount for each vector amount adjusting circuit 4 are stored. The ROM 14 also relates to the level and phase of each distortion signal ε output by the combiner 35.
A value capable of most compensating for the high-order intermodulation distortion generated when being amplified by the high frequency amplifier circuit 51 is stored. On the other hand, CP
U13 supplies the gain control signal SG to each variable amplifier 22 based on each detection signal output from the P / F detector 11 and the temperature sensor 12, respectively.
For 3, the attenuation control signal SA is supplied to each variable phase shifter 25.
To the vector amount adjusting circuit 4 and the vector amount controlling signal SV to the vector amount adjusting circuit 4. Further, the CPU 13 controls the vector amount adjusting circuit 34-3, so that the high-order intermodulation distortion (non-linear distortion) included in the output signal of the high frequency amplifier circuit 51 is reduced based on the detection signal of the distortion detector 15 described later. The adjustment amounts of 34-5 and 34-7 are controlled. The distortion detector 15 detects the distortion signal ε included in the drive signal (output signal) Sd output from the output synthesis circuit 6.
And one of the high-order intermodulation distortions contained in the output signal of the high frequency amplifier circuit 51 is detected.

Next, the overall operation of the non-linear distortion compensation circuit 1 will be described.

First, when the high frequency signal Si is input,
The P / F detector 11 detects the power value and frequency of the high frequency signal Si and outputs it as a detection signal to the CPU 13.
Further, the temperature sensor 12 detects the ambient temperature and outputs it as a detection signal to the CPU 13. Then, the CPU 13
Monitors input detection signals at all times and controls the gain control amount for each variable amplifier 22, the attenuation control amount for each variable attenuator 23, and the phase control for each variable phase shifter 25 corresponding to the combination of each detection signal. ROM and the phase control amount and attenuation control amount for each vector amount adjusting circuit 4
It is read out from 14 and outputs the gain control signal SG, the attenuation amount control signal SA, the phase amount control signal SP and the vector amount control signal SV corresponding to the respective control amounts to the corresponding circuits in real time.

Next, in each distortion generating circuit 3, each variable amplifier 22 amplifies the distributed high frequency signal Si with a gain based on each gain control signal SG, and each variable attenuator 23 outputs the output signal of the variable amplifier 22. Is attenuated with an attenuation amount based on each attenuation amount control signal SA and output to one input portion of each synthesizer 26. In addition, each amplifier 24 controls the distributed high-frequency signal S
i is amplified with a predetermined fixed gain, and each variable phase shifter 25 shifts the phase of the output signal of the amplifier 24 by a phase amount based on each phase amount control signal SP and outputs it to the other input section of each synthesizer 26. To do. Therefore, the combiner 2 of the third-order distortion generation circuit 3-3
6 outputs the third-order distortion signal ε3 as a high frequency signal S2-3. Similarly, the combiner 26 of the fifth-order distortion generation circuit 3-5
Outputs the third-order distortion signal ε3 and the fifth-order distortion signal ε5 as the high-frequency signal S2-5, and the combiner 26 of the seventh-order distortion generation circuit 3-7 outputs the third-order distortion signal ε3 and the fifth-order distortion signals ε5 and 7. The next distortion signal ε7 is output as the high frequency signal S2-7.

Then, the third-order distortion vector amount adjusting circuit 4-
3 shifts and attenuates the phase of the high-frequency signal S2-3 by the phase amount and the attenuation amount based on the vector amount control signal SV3, and outputs it to the distributor 31-3 in the output combining circuit. Similarly, the fifth-order distortion vector amount adjusting circuit 4-5 shifts and attenuates the phase of the high-frequency signal S2-5 with the phase amount and the attenuation amount based on the vector amount control signal SV5, and the distributor 3
1-5, and the 7th-order distortion vector amount adjusting circuit 4-7 shifts and attenuates the phase of the high-frequency signal S2-7 by the phase amount and the attenuation amount based on the vector amount control signal SV7, and the distributor 31 Output to -7. Then, each distributor 31
The high frequency signal S2 is divided into two and output. Also, the synthesizer 3
2 synthesizes the high frequency signals S2-3 and S2-5 and outputs a fifth-order distortion signal ε5, and the synthesizer 33 synthesizes the high frequency signals S2-5 and S2-5.
2-7 are combined and a 7th-order distortion signal ε7 is output. Then
Each vector amount adjustment circuit 34 causes each vector amount control signal SVO
The phase of the high-frequency signal S2 is phase-shifted and attenuated by the phase amount and the attenuation amount based on, and output to the combiner 35. Further, the linear circuit 5 linearly amplifies the distribution signal S1-1 (high-frequency signal Si) distributed by the input distributor 2 with a predetermined gain and outputs the amplified signal to the combiner 35. Then, the synthesizer 35
However, the third-order distortion signal ε3, the fifth-order distortion signal ε5, and the seventh-order distortion signal ε7
And the high frequency signal Si are combined to output the drive signal Sd.

Next, the high frequency amplifier circuit 51 power-amplifies the drive signal Sd and outputs the output signal So. At this time, the high-frequency amplifier circuit 51 causes the third-order distortion signal ε3 having a phase opposite to that of the higher-order intermodulation distortion generated when the high-frequency signal Si is amplified,
The fifth-order distortion signal ε5 and the seventh-order distortion signal ε7 are drive signals S
Since it is added to d in advance, the output signal So in which the high-order intermodulation distortions of the third to the seventh orders are extremely suppressed is generated.
In this case, the distortion detector 15 detects the distortion signal ε included in the drive signal Sd output from the distributor 36 and outputs it to the CPU 13 as the distortion detection signal Sε. Also, CP
U13 adjusts the vector amount of each vector amount adjusting circuit 34 based on the input distortion detection signal Sε such that the level and phase of each distortion signal ε become equal to the level and phase stored in advance in the ROM 14. To do. In this case, RO
M14 stores in advance the level and phase of each distortion signal ε that can most suppress the high-order intermodulation distortion generated by the high-frequency amplifier circuit 51. Therefore, the high frequency amplifier circuit 5
The high-order intermodulation distortion generated by 1 is reliably compensated and is sufficiently and most suppressed.

As described above, according to the non-linear distortion compensating circuit 1, the distortion signals ε from the third-order distortion signal ε3 to the seventh-order distortion signal ε7 and the high-frequency signal Si are combined by the predistortion method to improve the efficiency. The high-frequency amplifier circuit 5 does not cause a decrease and a rise in the device cost due to the adjustment cost.
It is possible to uniformly and sufficiently suppress the main third-order cross-modulation distortion to the seventh-order cross-modulation distortion among the high-order cross-modulation distortion that occurs when the signal No. 1 amplifies the high frequency signal. In addition, the CPU 13
Reads out the adjustment amount corresponding to each detection signal detected by the P / F detector 11 and the temperature sensor 12 from the ROM 14, and the variable amplifier 22, the variable attenuator 23, the variable phase shifter 25 and the vector amount adjusting circuit 4 are read. By controlling with the adjustment amount read out, the nonlinear distortion generated in the high frequency amplifier circuit 51 is 3 according to the frequency of the high frequency signal Si, the power of the high frequency signal Si, and the internal temperature.
It is possible to appropriately generate the third-order distortion signal ε3 to the seventh-order distortion signal ε7 that can sufficiently suppress the high-order cross-modulation distortion from the second-order cross-modulation distortion to the seventh-order cross-modulation distortion. As a result, high-order intermodulation distortion can be uniformly and sufficiently suppressed automatically.
Further, the CPU 13 causes the drive signal Sd or the output signal S
By adjusting the vector amount of each vector amount adjusting circuit 34 based on o so that the high-order intermodulation distortion included in the output signal So is the lowest, the high-frequency amplifier circuit 51 produces high-order intermodulation distortion. The most suppressed output signal So can be generated.

The present invention is not limited to the configuration shown in the above-mentioned embodiment of the invention, and can be modified as appropriate. For example, the non-linear distortion compensation circuit 1 shown in FIG. 1 has been described with respect to the configuration example having the Nth distortion generation sequence from the 3rd distortion generation sequence, but it is not necessary to have all the distortion generation sequences, and at least the 3rd distortion generation sequence is required. The high-frequency amplifier circuit 51 includes the generation sequence and any one or a plurality of distortion generation sequences from the fifth-order distortion generation sequence to the N-th distortion generation sequence, so that the high-frequency amplifier circuit 51 can generate the high-frequency signal Si.
It is possible to sufficiently suppress the high-order intermodulation distortion that is desired to be suppressed among the high-order intermodulation distortion that occurs when amplifying the. Further, as high-order cross-modulation distortion, since third-order cross-modulation distortion and fifth-order cross-modulation distortion cause the most adverse effects, it is preferable to provide at least a third-order distortion generation sequence and a fifth-order distortion generation sequence. As a configuration in this case, by omitting the 7th-order distortion generation sequence from the nonlinear distortion compensation circuit 1 shown in the embodiment of the present invention,
It can be easily configured. Further, the present invention can be effectively applied not only to the application of the predistortion type non-linear distortion compensating circuit but also to the circuit for generating the distortion signal ε in the forward type non-linear distortion compensating apparatus.

Further, in the nonlinear distortion compensating circuit 1, the distortion signal ε is generated by utilizing the nonlinear input / output characteristic inside the distortion generating circuit 3, but the nonlinear input / output characteristic of the diode is used to input / output the distortion signal ε. A distortion signal ε having an amplitude according to the amplitude characteristic (power series expansion approximation) may be generated, or the magnitude of each orthogonal component may be calculated by a vector synthesis method (a method of simultaneously compensating the nonlinear characteristics of the amplitude and the phase of the distortion signal ε). The distortion signal ε may be generated by directly controlling the vector amount of the distortion signal by controlling the depth and performing vector synthesis. Further, in the embodiment of the present invention, the high frequency signal S is used as the detector in the present invention.
a P / F detector 11 for detecting the frequency and power of i;
Temperature sensor 1 for detecting the internal temperature of the non-linear distortion compensation circuit 1
2 has been described, the detector of the present invention includes the frequency of the high-frequency signal Si, the power of the high-frequency signal Si, the temperature inside or near the nonlinear distortion compensation circuit, and the inside of the high-frequency amplifier circuit 51. A configuration of a detection circuit that detects at least one of the temperatures in the vicinity can be adopted.

[0041]

As described above, according to the non-linear distortion compensating circuit of the present invention, the N-order distortion signal and the input high-frequency signal capable of respectively compensating the N-order intermodulation distortion as the non-linear distortion based on the input high-frequency signal. By combining and outputting as an output signal, the high frequency generated when the high frequency amplification circuit amplifies the high frequency signal without causing a decrease in efficiency in the high frequency amplification circuit and a rise in the device cost due to the adjustment cost. Second-order modulation distortion can be suppressed uniformly and sufficiently. In this case, by providing a plurality of distortion generating circuits, a linear circuit, and an output synthesizing circuit, it is possible to reliably generate each Nth-order distortion signal based on the input high-frequency signal, and to generate each Nth-order distortion signal. It is possible to reliably generate the output signal by combining the signal and the linearly amplified input high frequency signal.

Further, according to the nonlinear distortion compensating circuit of the present invention, a linear circuit, a third-order distortion generating circuit and a fifth-order distortion generating circuit are provided, and the first distributor of the output combining circuit outputs the third-order distortion generating circuit. The signal is distributed, the second distributor distributes the output signal of the fifth-order distortion generating circuit, and the first combiner distributes the distribution signal distributed by the first distributor from the distribution signal distributed by the second distributor. A 5th-order distortion signal is generated by subtracting the 3rd-order distortion signal from the 1st distributor, a 5th-order distortion signal generated by the 1st combiner, and a linearly amplified input high-frequency signal. By combining and outputting an output signal, it is possible to reliably generate a third-order distortion signal, a fifth-order distortion signal, and a linearly amplified input high-frequency signal based on the input high-frequency signal, and 3rd order modulation distortion and 5th order mixing It is possible to reliably generate a distortion signal can be sufficiently suppressed modulation distortion.

Further, according to the nonlinear distortion compensating circuit according to the present invention, the vector quantity adjusting circuit for the third order distortion, which is configured to be able to adjust the vector quantity of the output signal outputted by the third order distortion generating circuit, and the fifth order The third-order intermodulation distortion as the non-linear distortion based on the input high-frequency signal is provided by including the fifth-order distortion vector amount adjusting circuit configured to adjust the vector amount of the output signal output by the distortion generating circuit. Further, it is possible to more reliably generate a distortion signal capable of sufficiently compensating for and suppressing the Nth order intermodulation distortion.

Further, according to the nonlinear distortion compensating circuit of the present invention, the first vector amount adjusting circuit configured to adjust the vector amount of the third-order distortion signal distributed by the first distributor, and the first combining And a second vector amount adjusting circuit configured to be able to adjust the vector amount of the fifth-order distortion signal generated by the converter, by adjusting both vector amount adjusting circuits, a third-order mixture as nonlinear distortion is generated. It is possible to more reliably compensate the modulation distortion and the fifth-order intermodulation distortion and generate a distortion signal that can be suppressed.

Further, according to the nonlinear distortion compensating circuit of the present invention, the control circuit inputs the detection signal of the detection circuit, reads out each adjustment amount corresponding to the detection signal from the memory, and at the same time the third-order distortion vector amount. The frequency of the input high-frequency signal, the power of the input high-frequency signal, the temperature inside or in the vicinity of the nonlinear distortion compensating circuit, Also, it is possible to appropriately generate a distortion signal capable of sufficiently suppressing the third-order cross-modulation distortion and the fifth-order cross-modulation distortion as nonlinear distortion according to at least one of the temperature inside or in the vicinity of the compensated high-frequency amplifier circuit. As a result, the high-order intermodulation distortion generated when the high-frequency amplifier circuit amplifies the high-frequency signal can be uniformly and sufficiently suppressed automatically.

Further, according to the non-linear distortion compensating circuit of the present invention, the control circuit adjusts the second vector amount adjusting circuit and the second vector amount adjusting circuit so that the non-linear distortion contained in the output signal of the compensated high frequency amplifying circuit is reduced. By controlling the adjustment amount of the vector amount adjustment circuit, the high-order intermodulation distortion generated when the high-frequency amplifier circuit amplifies the high-frequency signal is uniformly and sufficiently
Moreover, it can be suppressed automatically.

Further, according to the non-linear distortion compensating circuit of the present invention, each vector amount adjusting circuit is constructed so that the attenuation amount and the phase amount of the corresponding distortion signal can be adjusted. It is possible to more reliably compensate distortion and fifth-order intermodulation distortion and generate a distortion signal that can be suppressed.

[Brief description of drawings]

FIG. 1 is a nonlinear distortion compensation circuit 1 according to an embodiment of the present invention.
It is a basic block diagram of.

FIG. 2 is a spectrum diagram showing signal components of a drive signal Sd for explaining the operation principle of the non-linear distortion compensation circuit 1.

3 is a spectrum diagram for explaining the operation principle of the non-linear distortion compensation circuit 1, showing an output signal S generated by the high frequency amplifier circuit 51 in a state where distortion compensation is not performed. FIG.
It is a spectrum figure which shows the signal component of o.

FIG. 4 is a spectrum diagram for explaining the operation principle of the non-linear distortion compensation circuit 1, and is a spectrum diagram showing a signal component of the output signal So generated by the high frequency amplification circuit 51 in a distortion compensated state.

FIG. 5 is a nonlinear distortion compensation circuit 1 according to an embodiment of the present invention.
3 is a block diagram showing a specific configuration of FIG.

FIG. 6 is a block diagram showing a configuration of a conventional high frequency power amplifier 61.

FIG. 7 is a block diagram showing a configuration of a conventional nonlinear distortion compensation circuit 41.

[Explanation of symbols]

1 Nonlinear Distortion Compensation Circuit 2 Input Distributor 3-3 to 3-N Distortion Generation Circuit 4-3 to 4-N, 34-3, 34-5 Vector Amount Adjustment Circuit 5 Linear Circuit 6 Output Synthesis Circuit 11 PF Detection Device 12 Temperature sensor 13 CPU 14 ROM 15 Distortion detector 31-3, 31-5 Distributor 32, 33, 35 Combiner ε3 to εN Distortion signal Sd Drive signal Si High frequency signal So Output signal

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5J090 AA01 AA41 CA21 FA15 GN02                       GN04 KA16 KA23 KA33 KA68                       TA01 TA03                 5J500 AA01 AA41 AC21 AF15 AK16                       AK23 AK33 AK68 AT01 AT03

Claims (8)

[Claims] 1. A non-linear distortion compensating circuit for compensating for non-linear distortion of a compensated high-frequency amplifier circuit, wherein N-order intermodulation distortion (N is a natural number 3) as the non-linear distortion.
And an arbitrary plurality of odd numbers of 5 or more) are respectively generated based on the input high-frequency signal, and the generated N-order distortion signal and A non-linear distortion compensation circuit that synthesizes an input high frequency signal and outputs it as an output signal. 2. Each N based on the input high frequency signal
A plurality of distortion generating circuits for respectively generating secondary distortion signals, a linear circuit for linearly amplifying the input high frequency signal, the generated Nth-order distortion signals and the linearly amplified input high frequency signal, and the output The non-linear distortion compensating circuit according to claim 1, further comprising an output combining circuit that generates a signal. 3. A linear circuit for linearly amplifying the input high frequency signal, a third order distortion generating circuit for inputting the input high frequency signal to generate a third order distortion signal, and a third order distortion inputting the input high frequency signal. A fifth-order distortion generating circuit for generating a signal and a fifth-order distortion signal, and an output combining circuit for generating the output signal, wherein the output combining circuit distributes an output signal of the third-order distortion generating circuit And a second distributor for distributing the output signal of the fifth-order distortion generation circuit, and the fifth-order by subtracting the distribution signal distributed by the first distributor from the distribution signal distributed by the second distributor. A first combiner for generating a distortion signal, the third-order distortion signal distributed by the first distributor, the fifth-order distortion signal generated by the first combiner, and the linearly amplified input high-frequency signal. And the output signal Nonlinear distortion compensating circuit according to claim 1, wherein is configured and a second combiner for outputting Te. 4. A third-order distortion vector amount adjusting circuit configured to adjust the vector amount of the output signal output by the third-order distortion generating circuit, and the output output by the fifth-order distortion generating circuit. The nonlinear distortion compensating circuit according to claim 3, further comprising a fifth-order distortion vector amount adjusting circuit configured to adjust a vector amount of the signal. 5. A first vector amount adjusting circuit configured to adjust the vector amount of the third-order distortion signal distributed by the first distributor, and the fifth-order distortion generated by the first combiner. The non-linear distortion compensating circuit according to claim 3 or 4, further comprising a second vector amount adjusting circuit configured to adjust the vector amount of the signal. 6. Detecting at least one of the frequency of the input high-frequency signal, the power of the input high-frequency signal, the temperature inside or near the nonlinear distortion compensation circuit, and the temperature inside or near the compensated high-frequency amplifier circuit. Detector to
A memory for storing the adjustment amounts of the third-order distortion vector amount adjusting circuit and the fifth-order distortion vector amount adjusting circuit in association with the detection signal detected by the detector, and the memory corresponding to the input detection signal. And a control circuit which reads out the adjustment amounts from the memory and controls the read adjustment amounts corresponding to the third-order distortion vector amount adjustment circuit and the fifth-order distortion vector amount adjustment circuit. The nonlinear distortion compensation circuit according to claim 4. 7. A control for controlling the adjustment amount of the first vector amount adjustment circuit and the adjustment amount of the second vector amount adjustment circuit so that the nonlinear distortion included in the output signal of the compensated high frequency amplification circuit is reduced. And a circuit.
The nonlinear distortion compensation circuit described. 8. The non-linear distortion compensation circuit according to claim 4, wherein each of the vector amount adjustment circuits is configured to be able to adjust the attenuation amount and the phase amount of the corresponding distortion signal.