JPH06338731A - Linear amplification device - Google Patents

Abstract

PURPOSE:To provide a linear amplification device free from signal distortion and waveform distortion by providing a gain compensating circuit where an input signal power and an output signal power are compared with each other and the difference is negatively fed back to the input signal. CONSTITUTION:A part of an input signal is taken out by an input coupler 7 connected to the input side of a high output amplifier 500, and a part of an output signal is taken out by an output coupler 8 connected to the output side. The amplitude of the taken-out high frequency input signal and that of the output signal are compared with each other by a hybrid coupler 15, and the amplitude difference is outputted as a high frequency feedback signal. This feedback signal is fed back to the input signal by a feedback coupler 9 connected to the input side of the high output amplifier 500. Consequently, the gain of the high frequency input signal to be amplified by the high output amplifier 500 is adjusted, and thereby, the distortion of the amplitude of the high frequency signal component of the output signal is compensated, and the output signal amplified with linearity is outputted from a signal output terminal 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear amplifier,
In particular, the present invention relates to a linear amplification device that compensates for distortion of power amplification not only for a modulation signal but also for a high frequency signal.

[0002]

2. Description of the Related Art FIG. 24 shows, for example, JP-A-3-276912.
FIG. 1 is a block diagram showing a conventional linear amplification device described in Japanese Patent Publication No. 1-96200, in which 1 is a signal input terminal, 2 is a signal output terminal, 7 is an input coupler, 8 is an output coupler, and 16 and 17 are terminations. , 38 and 39 are envelope detectors, 40 is a power control circuit, 41 is an amplifier, 42 is a buffer amplifier, 4
3 is a difference signal generator, 44 is a voltage circuit, and 45 is a DC power supply terminal.

Next, the operation will be described. The radio signal incident from the signal input terminal 1 passes through the input coupler 7 and the power control circuit 40, is amplified by the amplifier 41, passes through the output coupler 8, and is output from the signal output terminal 2. Here, a part of the input signal is drawn from the input coupler 7, the envelope detector 38 on the input side detects the envelope of the amplitude of the signal, that is, the magnitude of the electric power of the radio wave, and the output coupler 8 From the above, a part of the input signal amplified by the amplifier 41 is taken in, and the envelope detector 39 on the output side similarly detects the magnitude of the electric power of the radio wave.

Then, the respective outputs of the envelope detectors 38 and 39 are compared by using a difference signal generator 43, the difference in gain as a result of the comparison is taken out as a signal, and this signal is buffered by the buffer amplifier 42. The voltage of the input signal is controlled by amplifying and inputting it to the power control circuit 40. At this time, part of the output of the envelope detector 38 on the input side is also sent to the voltage circuit 44 to which a bias voltage is applied by the DC power supply terminal 45, and the voltage circuit 44 responds to the input signal. A bias voltage is generated, and by applying this voltage to the amplifier 41, the amplifier 41 is variably controlled, and an output signal amplified according to the gain of the modulation signal component in the input signal is obtained from the signal output terminal 2. To

As described above, the power control circuit 40 and the voltage circuit 44 variably control the amplifier 41 to obtain a linear amplifier.

[0006]

The conventional linear amplifier is constructed as described above, and the envelope detection of the input signal and the output signal is performed and the envelope is compensated to compensate the distortion of the signal waveform. However, the distortion of this signal waveform is
As shown in FIG. 2, there are signal distortion that appears in the modulated signal and waveform distortion that appears in the high-frequency signal. Compensating the envelope means compensating only the signal distortion, and as is well known, the modulated signal The waveform distortion of the high frequency signal cannot be compensated by compensating for the signal distortion of the signal, and the distortion in the high frequency signal remains. Furthermore, in the case of a multi-signal amplifier, interference between signals in adjacent bands However, there is a problem that the third-order distortion and the like caused by the above cannot be removed.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a linear amplification device free from signal distortion and waveform distortion by compensating a high frequency signal. .

[0008]

According to a first aspect of the present invention, there is provided a linear amplifying device having a high output amplifier for amplifying a high frequency input signal, wherein the input signal of the input signal is added to the input side of the high output amplifier. An input coupling means for extracting the part, and an output coupling means for extracting a part of the output signal at the output side thereof,
An input / output coupling for comparing the amplitude of the high frequency input signal extracted by the input coupling means with the amplitude of the high frequency output signal extracted by the output coupling means, and outputting the difference in the compared amplitudes as a high frequency feedback signal. And a gain compensating circuit comprising feedback coupling means for feeding back the feedback signal to the input signal at the input side of the high output amplifier.

A linear amplifying device according to a second aspect is the first aspect.
The linear amplifying device according to the present invention, further detecting the phase of the high-frequency input signal, a part of which is taken out by the input coupling means, and the phase of the high-frequency output signal, a part of which is taken out by the output coupling means, and Comparing, the phase control means for generating a high-frequency phase control signal according to the phase difference, and the phase feedback means for feeding back the phase control signal to the input signal at the input side of the high-power amplifier A phase compensation circuit is provided.

A linear amplification device according to a third aspect of the present invention is the linear amplification device of the first aspect.
Alternatively, the input coupling means in the linear amplification device according to the second aspect has an input coupler connected between a signal input terminal and the high power amplifier, and the output coupling means is connected to the high power amplifier and the signal. An output coupler connected between the output terminal and the output terminal, a hybrid coupler as the input / output coupling means, and the input coupler and the high-power amplifier as the feedback coupling means. It has a feedback coupler connected between the two.

A linear amplifying device according to a fourth aspect is the second aspect.
The phase control means in the linear amplifying device according to the invention shifts the phase of the extracted high-frequency output signal by 90 °.
° Phase shifter, a phase detector that detects the phase and the phase of the extracted high-frequency input signal, and outputs a power signal corresponding to the phase difference, and a phase detector that detects the power signal output by the phase detector. A phase control signal generating circuit for converting the control signal to output, and further connecting the phase feedback means between the input coupler and the high output amplifier so that the gain is substantially constant in a predetermined operating range. And has a dual gate amplifier for changing the phase.

A linear amplifying device according to a fifth aspect is the first aspect.
Alternatively, the feedback coupling means in the linear amplification device according to the second aspect includes a feedback coupler connected between a portion for extracting the input signal of the input coupling means and the high-power amplifier.
The second feedback coupler is connected between the signal input terminal and the portion for extracting the input signal of the input coupling means.

A linear amplifying device according to a sixth aspect is the first aspect.
In the linear amplifying apparatus according to the present invention, the high-power amplifier is a multi-stage amplifier having a plurality of amplifiers, and a part of the high-power amplifier for extracting a part of the input signal of the input coupling means to an output stage of a predetermined amplifier. And a portion for returning the feedback signal of the feedback coupling means to the input signal.

A linear amplifying device according to a seventh aspect of the present invention is the second aspect.
In the linear amplifying apparatus according to the present invention, the high-power amplifier is a multi-stage amplifier having a plurality of amplifiers, and a part of the input signal of the input coupling means is taken out to an output stage of a predetermined amplifier of the high-power amplifiers. And a portion for returning the feedback signal of the feedback coupling means to the input signal and a portion for returning the phase control signal of the phase feedback means to the input signal.

A linear amplifying device according to an eighth aspect is the first aspect.
In the linear amplifying device according to the present invention, a delay circuit is inserted in the middle of a path for sending the input signal extracted by the input coupling means to the input / output coupling means.

A linear amplifying device according to a ninth aspect is the second aspect.
In the linear amplifying device according to the present invention, a delay circuit is inserted in the middle of the path for sending the input signal extracted by the input combining means to the input / output combining means and the middle of the path for sending the input signal to the phase control means. .

According to a tenth aspect of the present invention, there is provided a linear amplifying device according to the first or second aspect, wherein the feedback coupling means is provided between a portion for extracting the input signal of the input coupling means and the high power amplifier. It has a dual gate amplifier for gain adjustment which is connected and has a substantially constant phase in a predetermined operating range and which changes the gain.

A linear amplifying device according to an eleventh aspect of the present invention is characterized in that the feedback coupling means in the linear amplifying device according to the first or second aspect is provided between a portion for extracting the input signal of the input coupling means and the high output amplifier. A field effect transistor (hereinafter referred to as an FET) to which the above feedback signal is input to its source terminal that is connected and grounded via a source impedance, and an input matching circuit that is connected to its gate terminal and to which the above input signal is input. And an output matching circuit connected to the drain terminal thereof.

According to a twelfth aspect of the present invention, there is provided a linear amplification device according to the first or second aspect, further comprising means for detecting an envelope of a high frequency input signal, a part of which is taken out by the input coupling means. A means for detecting an envelope of a high-frequency output signal, a part of which is taken out by the output coupling means,
Means for comparing the envelope of the detected input signal with the envelope of the detected output signal, and means for changing the amount of attenuation of the input signal at the input side of the high power amplifier according to the comparison result. And an envelope compensation circuit composed of

According to a thirteenth aspect of the present invention, there is provided a linear amplifying apparatus according to the first or second aspect, wherein the input coupling means has a resistor or a capacitor for drawing in the input signal, and the output coupling means is further provided. It has a resistor or a capacitor for drawing the output signal.

According to a fourteenth aspect of the present invention, in the linear amplifying apparatus according to the first or second aspect, the feedback coupling means has a resistor or a capacitor for feeding the feedback signal to the input signal. is there.

According to a fifteenth aspect of the present invention, in the linear amplification device according to the second aspect, the feedback coupling means has a resistor or a capacitor for feeding the feedback signal to the input signal, and the phase feedback is provided. The means comprises a resistor or a capacitor for feeding the phase control signal to the input signal.

According to a sixteenth aspect of the present invention, in the linear amplifying apparatus according to the first or second aspect, the high output amplifier is a multi-stage amplifier having a plurality of amplifiers, and the linear amplifying apparatus further has the high output. A variable attenuator connected to an output stage of a desired amplifier of the amplifier and changing the amount of attenuation with respect to the input signal, and a variable attenuator through a buffer amplifier, and its output depending on a temperature change of the high power amplifier. The temperature compensating circuit is composed of a temperature sensitive element whose temperature changes.

[0024]

According to the present invention, a linear amplifier having a high-output amplifier such as a multistage amplifier for amplifying a high-frequency input signal is used, and a part of the input signal is connected by an input coupler connected to the input side of the high-output amplifier. An output coupling means for extracting a part of the output signal by an output coupling device connected to the output side of the high output amplifier, and an amplitude of the high frequency input signal extracted by the input coupling means, The amplitude of the high frequency output signal extracted by the output coupling means is compared by using a hybrid coupler or the like, and the difference between the compared amplitudes is output as a high frequency feedback signal. Since the gain compensating circuit constituted by the feedback coupling means for feeding back the feedback signal to the input signal by the feedback coupler connected to the input side is provided, it is amplified by the high output amplifier. That becomes possible to adjust the gain of the high frequency of the input signal, thereby can compensate for amplitude distortion of the high-frequency signal component of the output signal, from the signal output terminal,
An output signal amplified with linearity can be output.

Further, according to the present invention, the phase of the high-frequency input signal, a part of which is taken out by the input coupling means, and a part of which is taken out by the output coupling means, are set to 90 °.
A phase detector that detects and compares the phase of a high-frequency output signal whose phase has been adjusted with a phase shifter, and outputs a power signal according to the phase difference, and a power signal output by the phase detector. Phase for feeding back the phase control signal to the input signal by a phase control means having a phase control signal generating circuit for outputting the phase control signal of a high frequency and a dual gate amplifier connected to the input side of the high output amplifier Since the phase compensation circuit constituted by the feedback means is provided, the gain and phase of the high frequency input signal amplified by the high output amplifier are adjusted, whereby the amplitude of the high frequency signal of the output signal and Phase distortion can be compensated, and an output signal amplified with linearity can be output from the output terminal.

Further, in the present invention, the feedback coupling means is a feedback coupling means connected between the input coupling means of the input coupling means and the high output amplifier, the signal input terminal and the input coupling. Since it has a second feedback coupler and the like connected between the input coupler and the like, a high-frequency feedback signal is also inserted in the preceding stage of the input coupler and the like, and Fine adjustment of the gain is possible, which can further improve the linearity.

Further, in the present invention, an input coupler of the input coupling means, a feedback coupler of the feedback coupling means, or the like, or the phase feedback is provided at the output stage of a predetermined amplifier of the high output amplifiers. Since the dual gate amplifier or the like of the means is connected, the above-mentioned input signal of a high level is taken in, so that the signal can be easily processed and the amplitude or phase can be controlled accurately and easily.

In the present invention, a delay circuit is further connected between the input coupler of the input coupling means and the hybrid coupler of the input / output coupling means, and further, the delay circuit is connected to the input coupler and the like. Since the delay circuit is also connected to the phase detector of the phase control means, a time delay that occurs while the input signal passes through the high output amplifier is taken into consideration. Phase control can be performed.

Further, in the present invention, since the gain adjusting dual gate amplifier or the source-grounded FET is used as the feedback coupling means, the feedback coupling means has the performance of an amplifier. Feedback can be easily applied to the input signal.

Further, in the present invention, means for detecting the envelope of the high frequency input signal, a part of which is taken out by the input coupling means, and high frequency output signal, a part of which is taken out by the output coupling means. Means for detecting the envelope of the, the means for comparing the envelope of the detected input signal and the envelope of the detected output signal, the input signal at the input side of the high output amplifier according to the comparison result On the other hand, since the envelope compensating circuit constituted by the means for changing the amount of attenuation is provided, the distortion in the envelope of the high frequency output signal is also compensated, whereby the amplification is performed with higher linearity. An output signal can be output.

Further, in the present invention, since the input coupling means and the output coupling means, or the feedback coupling means or the phase feedback means respectively use resistors or capacitors, the input signal and It is possible to take out the output signal and to feed back the feedback signal or the phase control signal to the input signal, whereby each of the above-mentioned couplers requiring a half wavelength length of the signal to be processed. Alternatively, the gain compensating circuit and the phase compensating circuit which are smaller than those using the dual gate amplifier or the FET can be used.

Further, in the present invention, a variable attenuator that changes the amount of attenuation of the input signal is connected to the output stage of a desired amplifier of the high output amplifier so as to respond to the temperature change of the high output amplifier. Since a temperature compensating circuit in which a temperature sensitive element whose output changes is connected to the variable attenuator through a buffer amplifier is provided, a signal from the temperature sensitive element according to a temperature change of the high power amplifier is used to perform the variable damping. Will adjust the attenuation of the input signal,
The temperature characteristic of the high power amplifier can be compensated.

[0033]

【Example】

Example 1. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a linear amplifier according to the first embodiment. In FIG. 1, 1 is an input terminal, 2
Is an output terminal, and 3 to 5 are amplifiers provided between the input terminal 1 and the output terminal 2, thereby constituting a three-stage high output amplifier 500. 6 is a variable amplifier, 7 is an input coupler provided at the next stage of the input terminal 1, 8 is an output coupler provided at the next stage of the high output amplifier 500, 9 is an input coupler, and a high output amplifier 500. A feedback coupler provided between the two, 10 is an isolator, 11 and 12 are variable phase shifters, 13 and 14 are variable attenuators, 15 is a hybrid coupler, and 16 to 19 are attached to one end of each coupler. It is an absorption type termination.

First, the linear high output amplifier 5 according to the present invention.
00 gain compensation will be described. The input / output characteristics of the linear high output amplifier 500 are linearly amplified regardless of the input signal of any power level, and the output has the same waveform as the input signal and its power is amplified. It is ideal to output a different output signal. But,
In reality, the input / output characteristic exhibits non-linearity depending on the power level of the input signal, which causes distortion in the output signal. As shown in FIG. 2, it appears as waveform distortion and signal distortion. Here, the waveform distortion is distortion of the amplitude of the high frequency signal, and the signal distortion is distortion of the envelope of the high frequency signal. In order to compensate for these distortions, it is understood that the input / output characteristics of the linear high-power amplifier 500 should have an ideal straight line.

This will be described in more detail with reference to FIG. 3 showing the input / output characteristics of the high output amplifier 500.
, The input signal power Pin is Pin <
Within the range of Pi1, the gain of the high-power amplifier 500 is constant, the output signal power Pout linearly increases according to the given input signal power Pin, and its input / output characteristic has a slope of 45 degrees. The input signal power Pin
Is greater than Pi1, the output signal power Pout is gradually saturated,
Above Pi2, it saturates almost completely. That is, waveform distortion and signal distortion appear in the output signal. For this reason, a negative feedback circuit is used to change the amount of attenuation according to the power level of the input signal Pin of the high-power amplifier 500 so that the input / output characteristic becomes a compensation straight line as shown by the alternate long and short dash line in FIG. The gain compensation is performed by the above, and thereby the above-mentioned linear high output amplifier 500 exhibiting linearity in its input / output characteristic is obtained.

Next, the operation of the linear amplifier according to the first embodiment will be described. First, the high frequency input signal extracted by the input coupler 7 is amplified by the variable amplifier 6 and input to one terminal of the hybrid coupler 15 as an I1 signal. On the other hand, the high frequency output signal taken out by the output coupler 8 is attenuated to a predetermined value by the variable attenuator 14, and the variable phase shifter 12 makes the linear high output amplifier 5
00 and the variable attenuator 14 and the phase shift caused by the high frequency signal is finely adjusted.
The signal has the same phase as the signal and is input to the other terminal of the hybrid coupler 15 as an O1 signal. At this time, the variable amplifier 6 and the variable attenuator 14 have the above-mentioned I when the input signal power Pin in FIG. 3 is within the range of Pin <Pi1.
The relationship between the power of one signal and the power of the O1 signal is I1 <
The amplification amount and the attenuation amount are set so as to become O1.

Then, the hybrid coupler 15 shifts the phase of the O1 signal by 180 degrees to obtain the I1 signal.
The combined signal VD is output to the output terminal of the hybrid combiner 15. That is, as shown in the relationship in FIG.
Compares the power level of the I1 signal with the power level of the O1 signal. If they are the same power level, no output is output from the output terminal, but if they are different power levels, the comparison difference is determined. Output VD signal.

Next, the VD signal is subjected to the ΔATT shown in FIG. 4 by the variable attenuator 13 set to a predetermined amount of attenuation.
Variable phase shifter 1
By 1, the phase is finely adjusted so as to be equal to the phase of the input signal.

The power of the ATT signal ΔATT
Is fed back to the input signal by the feedback coupler 9. At this time, the ATT signal is 1 with respect to the input signal.
Since there is a phase difference of 80 degrees, -Δ in the input signal
Negative feedback of the size of ATT will be applied.

Here, as shown in FIG. 3, when the input signal power Pin increases, becomes Pi1, and further becomes Pi2, the output signal power Pout gradually begins to saturate.
As shown in FIG. 4, the power ΔATT of the ATT signal is
Since the power of the input signal becomes ΔATT1 at the time of Pi1, and further decreases to ΔATT2 at the time of Pi2,
The amount of negative feedback applied to the input signal will be reduced.
As a result, the input / output characteristic of the high-power amplifier 500 shown in FIG. 3 becomes the compensation straight line shown by the alternate long and short dash line, and the linear high-output amplifier 500 having the linear input / output characteristic can be obtained.

In the first embodiment, the high output amplifier 500 compares the input signal power Pin with the output signal power Pout as described above, and the difference is compared to the power signal AT.
Since the gain compensation circuit is provided so that the input signal is negatively fed back, the gain of the high frequency signal included in the input signal amplified by the high output amplifier 500 is adjusted. Thus, it is possible to compensate the waveform distortion which is the distortion of the amplitude of the high frequency signal of the output signal, and the signal distortion which is the distortion of the envelope of the output signal is also compensated, and the power of the input signal is output from the output terminal 2. The output signal amplified linearly can be output regardless of the level.

Example 2. A second embodiment of the present invention will be described below with reference to the drawings. FIG. 6 is a block diagram showing a linear amplifier according to the second embodiment. In FIG. 6, 1 is an input terminal, 2 is an output terminal, and 3 to 5 are amplifiers, which constitute a three-stage high-power amplifier 500. 6 and 21 are variable amplifiers, 7 is an input coupler, 8 is an output coupler, 9 is a feedback coupler, 10 is an isolator, 11 and 12 are variable phase shifters, 13, 14 and 23 are variable attenuators, 15 Is a hybrid coupler, 16 to 19 are absorption type terminations, 20 is a phase control signal generating circuit composed of an operational amplifier and a transistor circuit for setting its output within a predetermined range, and 22 is a 90 ° phase shifter. , 24 is a reference voltage source, 25 is a phase detector, and 26 is a dual gate amplifier (FE) provided between the input coupler 7 and the feedback coupler 9.
T).

The first embodiment is the high power amplifier 500.
The linear amplifying apparatus has a gain compensating circuit added thereto, but the second embodiment is a linear amplifying apparatus to which a phase compensating circuit is further added. Since the operation and the operation are the same as those in the first embodiment, the description thereof will be omitted, and only the configuration and operation of the phase compensation circuit will be described here.

First, the input signal input from the input terminal 1 is taken out by the input coupler 7 provided in the next stage of the input terminal 1 and sent to the gain compensation circuit according to the first embodiment and the variable amplifier 21. To be The variable amplifier 21 amplifies the input signal and inputs it to the phase detector 25. On the other hand, the output signal taken out by the output combiner 8 provided on the output side of the high-power amplifier 500 is attenuated by the variable attenuator 23, its amplitude is made equal to that of the amplified input signal, and the phase detector is detected. 25 is input. Then, the phase detector 25 outputs the phase difference between the input signals whose amplitudes are equalized and the output signal as an output V1 which is input to the phase control signal generating circuit 20.
At this time, the relationship between the output V1 of the phase detector 25 and the phase difference ΔΦ is as shown in FIG.
The output V1 of No. 5 becomes a cosine function of the phase difference ΔΦ, and the rate of change becomes maximum at the phase difference ΔΦ = π / 2.
Therefore, in order to maximize the phase detection sensitivity at ΔΦ = 0 and detect the polarity of the phase difference, 90
By providing the phase shifter 22, the phase is shifted by 90 degrees, and the output V1 of the phase detector 25 as shown in FIG.
And the phase difference ΔΦ, and this output V1 is input to the phase control signal generating circuit 20.

Next, the reference voltage V2 in the reference voltage source 24 is supplied to the phase control signal generating circuit 20, and the reference voltage V2 and the output V of the phase detector 25 are supplied.
The phase control signal generating circuit 20 receives 1 as an input and generates a phase control signal P'in which is a high frequency power signal. The relationship between the phase control signal P'in in the phase control signal generating circuit 20 and the output V1 of the phase detector 25 is shown in FIG.

The phase control signal P'in is supplied to one gate electrode of the dual gate amplifier 26,
The phase of the input signal input to the other gate electrode is changed.

The process of changing the phase will be described in more detail below. FIG. 7 shows the high power amplifier 5 described above.
12 is a diagram showing the relationship between the power Pin of the input signal to the signal 00 and the phase φ of the output signal at its output end; FIG.
FIG. 11 shows the phase control signal P'in supplied to one gate electrode of the dual gate amplifier 26, and the phase change amount Δφ generated at the output terminal when the phase control signal P'in is supplied. It is a figure which shows the relationship of.

As shown in FIG. 7, the power P of the input signal is
Within the range up to point A, the phase φ of the input signal is constant even if the power Pin of the input signal changes, and no phase shift occurs in the output signal. However, when the power Pin of the input signal exceeds the point A, a phase shift occurs in the output signal.
That is, when the power Pin of the input signal increases by ΔPin, the phase of the output signal deviates from the phase of the input signal by Δφ accordingly. Here, as described above, the output V1 of the phase detector 25 generated according to the phase difference ΔΦ between the phase of the input signal and the phase of the output signal is increased by ΔV1. P'in is reduced by ΔP'in.

Then, the above dual gate amplifier 26
The phase control signal P′in supplied to one of the gate electrodes is decreased by ΔP′in, and
As indicated by the arrow of 1, it acts to reduce the increased phase shift Δφ.

This function will be described below with reference to FIG. 12, which is a specific characteristic diagram of the dual gate amplifier 26. As shown in FIG. 12, the dual gate amplifier 2
6 is a high frequency power (P ') supplied to one of the gate electrodes.
(in) changes the phase and gain of the signal passing between the other input terminal, which is the gate electrode, and its output terminal. A signal obtained by adding the input signal and this change amount is output from the output terminal. here,
In order to control the phase by utilizing this characteristic, it is desirable that the gain is as constant as possible. From FIG. 12, in the dual gate amplifier 26, the high frequency power (P '
It can be seen that the gain is almost constant within the range of (in) from B to C and only the phase is changed. Therefore, the phase control signal generation circuit 20 sets the phase control signal P'in, which is a high frequency power signal, so as to change only within the range from B to C, and operates the dual gate amplifier 26 within this range. By doing so, it is possible to perform control such that the gain is substantially constant and only the phase is changed, that is, the phase control.

In the second embodiment, in addition to the gain compensation circuit in the first embodiment, the linear high output amplifier 500 is provided with the phase of the high frequency input signal extracted by the input coupler 7 and the output coupler 8. A phase control signal generation circuit 20 for generating a phase control signal P'in corresponding to the phase difference ΔΦ with the phase of the high-frequency output signal taken out in step 1 is provided. , The dual gate amplifier 26 provided between the feedback gate coupler 9 for gain feedback, and the dual gate amplifier 26.
To the input signal input to one of the gate electrodes,
Since the phase compensating circuit for feeding back the phase amount of the phase shift Δφ generated in the high output amplifier 500 is provided,
In addition to compensating the gain of the high frequency signal included in the input signal amplified by the high power amplifier 500, the phase thereof can be adjusted, whereby the amplitude and phase distortion of the high frequency signal of the output signal can be corrected. Compensation possible, output terminal 2
Can output the output signal amplified linearly regardless of the power level of the input signal.

Example 3. The third embodiment of the present invention will be described below with reference to the drawings. FIG. 13 is a block diagram showing a linear amplifier according to the third embodiment. In FIG.
The same reference numerals as those in FIG. 1 in the first embodiment indicate the same or corresponding parts, and 45 is an amplifier, 47 is a second feedback coupler, and 46 is attached to one end of a second feedback coupler 47. An absorption type termination, 48 is a variable phase shifter, and 49 is a variable attenuator.

The linear amplifier according to the third embodiment includes the input terminal 1 of the circuit of the linear amplifier according to the first embodiment,
Between the input coupler 7 and the input terminal 1, the second stage is provided next to the input terminal 1.
The feedback coupler 47 of, and the amplifier 45 in the next stage,
In addition, a path for transmitting a signal from the variable attenuator 13 to the variable phase shifter 11 is branched into two paths, one of which is a variable attenuator 49 and a variable phase shifter is provided next to the variable attenuator 49. And the output of the variable phase shifter 48 is input to the second feedback coupler 47. Amplifier 4 above
Reference numeral 5 corrects the attenuation of the gain of the input signal caused by providing the second feedback coupler 47.

Next, the operation will be described. Example 1 above
Since the operation of the same circuit part as is the same, the description thereof will be omitted, and the operation of the circuit newly added to the circuit of the first embodiment will be described here. First, the hybrid coupler 15 compares the power level of the I1 signal, which is obtained by adjusting the input signal power Pin, with the power level of the O1 signal, which is obtained by adjusting the output signal power Pout, If the power levels are different, the VD signal output to the output terminal in accordance with the comparison difference has the AT of the magnitude of ΔATT in the variable attenuator 13.
After being converted into the T signal, the ATT signal is sent to the variable phase shifter 11 and the variable attenuator 49.

Then, the ATT signal is further attenuated by the variable attenuator 49 so as to become an ATT 'signal having a power level of ΔATT', and the phase thereof is changed by the variable phase shifter 48 to the input signal. Finely adjusted to be equal to the phase of.

Then, the power ΔAT of the ATT 'signal
T'is fed back to the input signal by the second feedback coupler 47. At this time, since the ATT 'signal has a phase difference of 180 degrees with respect to the input signal, negative feedback of the magnitude of-? ATT' is applied to the input signal.

As described above, in the third embodiment, the input coupler 7 constituting the gain compensation circuit according to the first embodiment is formed.
And the second feedback coupler 4 between the input terminal 1 and the input terminal 1.
7 is provided and ΔAT from the ATT signal having the feedback amount ΔATT for compensating the gain of the output signal
The ATT 'signal having a feedback amount of ΔATT' smaller than T is input to the second feedback coupler 47,
Since the negative feedback of the magnitude of -ΔATT 'is applied to the input signal, the gain amount of the high frequency signal of the input signal of the high output amplifier 500 can be finely changed, and the gain according to the first embodiment can be obtained. It is possible to obtain a linear amplification device exhibiting more complete linearity than the linear amplification device which performs the negative feedback control of.

Example 4. Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 14 is a block diagram showing a linear amplifier according to the fourth embodiment. In FIG.
The same reference numerals as those in FIG. 1 in the second embodiment indicate the same or corresponding parts, 47 is a second feedback coupler, and 46 is an absorption type termination attached to one end of the second feedback coupler 47. , 48 is a variable phase shifter, and 49 is a variable attenuator.

The linear amplifier according to the fourth embodiment includes the input terminal 1 of the circuit of the linear amplifier according to the second embodiment,
Between the input coupler 7 and the input terminal 1, the second stage is provided next to the input terminal 1.
Of the variable phase shifter 11 is provided.
The path for sending a signal from the feedback coupler 9 to the feedback coupler 9 is branched into two paths, one of which is provided with a variable attenuator 49 and a variable phase shifter 48 at the next stage of the variable attenuator 49. The output of the variable phase shifter 48 is input to the second feedback coupler 47. And the above dual gate amplifier 26
Is not between the input combiner 7 and the feedback combiner 9, but rather the feedback combiner 9 and the high-power amplifier 500.
It was set up between and.

Next, the operation will be described. Example 2 above
Since the operation of the same circuit part as is the same, the description thereof will be omitted, and here, the operation of the circuit newly added to the circuit of the second embodiment will be described. First, the hybrid coupler 15 compares the power level of the I1 signal, which is obtained by adjusting the input signal power Pin, with the power level of the O1 signal, which is obtained by adjusting the output signal power Pout, If the power levels are different, the VD signal output to the output terminal in accordance with the comparison difference has the AT of the magnitude of ΔATT in the variable attenuator 13.
After being made a T signal and finely adjusted by the variable phase shifter 11 so that its phase becomes equal to the phase of the input signal, this ATT signal is fed to the feedback coupler 9 and the variable attenuator 49. Sent.

Then, the ATT signal is further attenuated by the variable attenuator 49 so as to become an ATT ′ signal having a power level of ΔATT ′, and the phase generated by passing through the variable attenuator 49 is reduced. The shift is finely adjusted by the variable phase shifter 48 so as to be equal to the phase of the input signal.

Then, the power ΔAT of the ATT 'signal
T'is fed back to the input signal by the second feedback coupler 47. At this time, since the ATT 'signal has a phase difference of 180 degrees with respect to the input signal, negative feedback of the magnitude of-? ATT' is applied to the input signal.

As described above, in the fourth embodiment, the input coupler 7 which constitutes the gain compensation circuit according to the second embodiment.
And the second feedback coupler 4 between the input terminal 1 and the input terminal 1.
7 is provided and ΔAT from the ATT signal having the feedback amount ΔATT for compensating the gain of the output signal
The ATT 'signal having a feedback amount of ΔATT' smaller than T is input to the second feedback coupler 47,
Since the negative feedback of the magnitude of -ΔATT 'is applied to the input signal, the phase of the high frequency signal of the input signal can be controlled and the gain amount of the high frequency signal can be finely changed. It is possible to obtain a linear amplification device that exhibits more complete linearity and is capable of phase compensation than the linear amplification device that performs negative feedback control of gain and phase control according to the second embodiment.

Examples 5, 6. A fifth embodiment of the present invention will be described below with reference to the drawings. FIG. 15 is a block diagram showing a linear amplification device according to the fifth embodiment. In FIG. 15, the same reference numerals as those in FIG. 1 in the first embodiment indicate the same or corresponding portions, and 50 is an amplifier.

In the fifth embodiment, as shown in FIG. 15, the input coupler 7 for extracting the input signal of the circuit of the linear amplifying device according to the first embodiment and the feedback for applying the negative feedback to the input signal. For the high power amplifier 5
00 is provided between the amplifier 4 and the amplifier 5, and the amplifier 50 is provided between the input terminal 1 and the high output amplifier 500. Also, since the power level of the input signal to be processed rises, the variable amplifier 6 is no longer necessary, so this is removed.

Next, the operation will be described. First, the input signal including the high frequency signal input from the input terminal 1 is
The gain is amplified by the amplifier 50 and the amplifiers 3 and 4 constituting the high-power amplifier 500.

Next, a part of the amplified input signal is taken out by the input coupler 7 provided at the next stage of the amplifier 4 and provided at the output side of the high output amplifier 500. The output combiner 8 extracts a part of the output signal.

As in the first embodiment, the amplified input signal is directly input to the hybrid coupler 15 as the I1 signal, and the output signal is attenuated.
The signal O1 whose phase is finely adjusted is input to the other end of the hybrid coupler 15, and an ATT signal having a power of .DELTA.ATT, which is generated by comparing the amplitudes of the signals, is fed to the feedback coupler 9. Negative feedback having a magnitude of −ΔATT is applied to the input signal thus input and amplified.

In the fifth embodiment, the input coupler 7 and the feedback coupler 9 of the gain compensating circuit according to the first embodiment constitute the high-power amplifier 500.
And the amplifier 5 and the amplified input signal having a high power level is input to the hybrid coupler 15, the signal processing for producing the ATT signal as a feedback signal is performed. As a result, it is possible to perform gain compensation with less error, and it is possible to obtain a linear amplifier having linear characteristics regardless of the power level of the input signal.

The sixth embodiment of the present invention will be described below. In the sixth embodiment, the input coupler 7 for extracting the input signal of the circuit of the linear amplifier according to the second embodiment,
The dual gate amplifier 26 for controlling the phase of the input signal and the feedback coupler 9 for applying negative feedback to the input signal are connected to the high output amplifier 500.
And the amplifier 50 is provided between the input terminal 1 and the high output amplifier 500. Further, the power level of the input signal to be processed rises, so that the variable amplifier 6
Since the variable amplifier 21 is no longer needed, it is removed.

Then, the linear amplifying device of the sixth embodiment performs gain compensation with the input signal of high power level, as in the fifth embodiment. Further, the input signal having the high power level is also input to the phase detector 25 of the phase compensation circuit according to the second embodiment. The subsequent operation for compensating the phase is as described in the second embodiment.

Also in the sixth embodiment, the input coupler 7 of the gain compensation circuit according to the second embodiment, the dual gate amplifier 26, and the feedback coupler 9 constitute the high output amplifier 500. 4 and the amplifier 5 to amplify the input signal amplified and increased in power level to the hybrid coupler 15 and the phase detector 25.
Since it is input to and
The signal processing for producing the T signal and the P'in signal for controlling the dual gate amplifier 26 is facilitated, whereby gain compensation and phase compensation with a small error can be performed, and the input It is possible to obtain a linear amplifier having linear characteristics regardless of the power level of the signal.

Examples 7 and 8. Hereinafter, a seventh embodiment of the present invention will be described with reference to the drawings. FIG. 16 is a block diagram showing a linear amplifier according to the seventh embodiment. 16, the same reference numerals as those in FIG. 1 in the first embodiment indicate the same or corresponding portions, and 27 is a delay line having a predetermined delay amount.

In the linear amplifier of the seventh embodiment, in the gain compensation circuit of the linear amplifier of the first embodiment, the variable amplifier 6 and the input terminal of the hybrid coupler 15 are input to the input terminal 1. The input signal from the input coupler 7
The delay line 27 has the same delay amount as the delay time generated during the propagation from the path to the output coupler 8.

The operation of the gain compensation circuit according to the seventh embodiment is almost the same as the operation described in the first embodiment, and the difference will be described below. In the gain compensation circuit of the first embodiment, the hybrid coupler 15 outputs the I1 signal and the O signal.
At the time of comparing with one signal, the comparison was performed in a state where the time delay due to the propagation described above is included in the O1 signal. However, in the gain compensation circuit according to the seventh embodiment, the delay line 27 provided in front of the terminal of the hybrid coupler 15 for inputting the I1 signal causes the delay line 27 to be applied to the I1 signal.
The same delay time as that included in one signal is included, and the hybrid coupler 15 compares the I1 signal with the O1 signal.

In the seventh embodiment, since the delay line 27 is provided between the variable amplifier 6 of the gain compensation circuit of the first embodiment and the input terminal of the hybrid coupler 15, the input coupler is provided. It is possible to compensate for the delay time generated during the propagation from the path from 7 to the output coupler 8 and to obtain a linear amplifier device that performs gain compensation with higher accuracy than the gain compensation according to the first embodiment.

The eighth embodiment of the present invention will be described below. In the linear amplifier of the eighth embodiment, the gain compensating circuit of the linear amplifier according to the second embodiment is similar to that of the seventh embodiment, and further, the variable amplifier 21 of the phase compensating circuit is provided.
The delay line 27 used in the seventh embodiment is provided between the phase detector 25 and the phase detector 25.

Also in the eighth embodiment, the delay line 27 is provided between the variable amplifier 6 of the gain compensation circuit of the second embodiment and the input terminal of the hybrid coupler 15,
Further, since the delay line 27 is provided between the variable amplifier 21 of the phase compensation circuit and the phase detector 25, the delay line 27 is generated during the propagation from the input coupler 7 to the output coupler 8. The delay time can be compensated in the gain compensation circuit and the phase compensation circuit, and a linear amplification device that performs gain compensation and phase compensation with higher accuracy than the gain compensation and phase compensation according to the second embodiment can be obtained. .

Examples 9 and 10. The ninth embodiment of the present invention will be described below with reference to the drawings. FIG. 17 is a block diagram showing a linear amplifier according to the ninth embodiment. 17, the same reference numerals as those in FIG. 1 in the first embodiment indicate the same or corresponding portions, and 28 is a gain adjusting dual gate amplifier for feeding back the gain of the input signal.

The linear amplifier of the ninth embodiment is the feedback coupler 9 of the gain compensation circuit of the linear amplifier of the first embodiment.
Instead of this, a gain adjusting dual gate amplifier 28 is provided, and the input signal is input to one gate terminal of the gain adjusting dual gate amplifier 28, and the input signal and the output signal are input to the other gate terminal. Power difference ΔAT
An ATT signal having T is input.

The gain adjusting dual gate amplifier 28
Is the phase control signal P'in in the second embodiment, for example.
Therefore, the dual gate amplifier 26 used for controlling the phase of the input signal is used. In the second embodiment, of the characteristics of the dual gate amplifier 26 shown in FIG. 12, the portion in which the gain is substantially constant and the phase is changed is used, but in the ninth embodiment, the phase is changed among the characteristics. Uses the part that changes the gain when is almost constant.

Thus, in the gain adjusting dual gate amplifier 28, when the ATT signal is input to one of the gate terminals, the ATT signal is input to the other gate terminal according to the power amount ΔATT. The gain of the input signal will be changed.

Here, the operating range of the gain adjusting dual gate amplifier 28 in which the phase is substantially constant and the gain is changed is obtained, for example, by optimally selecting the load on the output side of the high output amplifier 500.

In the ninth embodiment, instead of the feedback coupler 9 in the gain compensation circuit of the linear amplifier according to the first embodiment, the gain adjusting dual gate amplifier 2 is used.
Since 8 is used, the size of the element corresponding to the length of λ / 2 (λ is the wavelength of the input signal), which is required by using the feedback coupler 9, can be omitted, and the gain can be reduced. It is possible to obtain a small linear amplification device that can be compensated.

The tenth embodiment of the present invention will be described below. In the tenth embodiment, the gain compensating circuit of the linear amplifier according to the second embodiment is the gain compensating circuit according to the ninth embodiment. Also in the tenth embodiment, as in the ninth embodiment, by using the feedback coupler 9, it is possible to omit the element size corresponding to the length of λ / 2, and to obtain the gain. It is possible to obtain a small linear amplification device capable of compensation and phase compensation.

Examples 11 and 12. Hereinafter, the first aspect of the present invention
A first embodiment will be described with reference to the drawings. FIG. 18 is a block diagram showing a linear amplifier according to the eleventh embodiment. Figure 1
In FIG. 8, the same reference numerals as those in FIG. 1 in the first embodiment indicate the same or corresponding portions, 30 is an FET for feeding back the gain of an input signal, 29 is an input matching circuit provided at the gate terminal of the FET 30, 31 Is a source impedance provided at the source terminal of the FET 30, and one end thereof is grounded. Reference numeral 32 is an output matching circuit provided at the drain terminal of the FET 30.

The linear amplifier of the eleventh embodiment includes an FET 30 in place of the feedback coupler 9 of the gain compensation circuit of the linear amplifier of the first embodiment, and the gate terminal of the FET 30 and the input coupler 7 are provided. An input matching circuit 29 is provided between the input terminal 1 and the high output amplifier 500, and an output matching circuit is provided between the drain terminal of the input matching circuit 29 and the high output amplifier 500. The ATT signal having the power difference ΔATT between the input signal and the output signal is input between the source terminal of the FET 30 and the source impedance 31.

The source terminal of the FET 30 is grounded through the source impedance 31. The amplification factor of the FET 30 changes according to the power amount ΔATT of the ATT signal, and the input signal input to the gate terminal of the FET 30 is changed. Therefore, negative feedback is applied.

Also in the eleventh embodiment, since the FET 30 is used instead of the feedback coupler 9 in the gain compensation circuit of the linear amplifier according to the first embodiment, the feedback coupler 9 is used. As a result, the size of the element required for the length of λ / 2 can be omitted, and a small-sized linear amplification device capable of gain compensation can be obtained.

The twelfth embodiment of the present invention will be described below. In the twelfth embodiment, as in the eleventh embodiment, the size of the element corresponding to the length of λ / 2, which is required by using the feedback coupler 9, can be omitted, and the gain compensation can be performed. Further, it is possible to obtain a small linear amplifier capable of phase compensation.

Examples 13 and 14. Hereinafter, the first aspect of the present invention
A third embodiment will be described with reference to the drawings. FIG. 19 is a block diagram showing a linear amplifier according to the thirteenth embodiment. Figure 1
In FIG. 9, the same reference numerals as those in FIG. 1 in the first embodiment indicate the same or corresponding portions, 33 is an input resistor for extracting a part of the input signal, 34 is an output resistor for extracting a part of the output signal, and 50 is an amplifier. .

The linear amplifier of the thirteenth embodiment uses the input resistor 33 in place of the input coupler 7 of the gain compensating circuit in the gain compensating circuit of the linear amplifier of the first embodiment. , An amplifier 50 for expanding an input signal between the input terminal 1 and the input terminal 1, an output resistor 34 is used in place of the output coupler 8, and a high output amplifier 500 is provided.
The input signal to and the output signal thereof are simply taken out, and the feedback coupler 9 is provided between the amplifier 4 and the amplifier 5 of the high output amplifier 500. Regarding the operation of this gain compensation circuit,
This is as described in the first embodiment.

In the thirteenth embodiment, the input resistor 33 is used in place of the input coupler 7 in the gain compensation circuit of the linear amplifier according to the first embodiment, and the output coupler 8 is used in place of the input resistor 33. Since the output resistor 34 is used, the size of each element for the length of λ / 2, which is required by using the input coupler 7 and the output coupler 8, can be omitted. It is possible to obtain a small-sized linear amplification device that can perform gain compensation.

The fourteenth embodiment of the present invention will be described below. In the fourteenth embodiment, the input combiner 7 and the output combiner 8 used in the gain compensating circuit and the phase compensating circuit of the linear amplifying device according to the second embodiment are the same as in the thirteenth embodiment, respectively. The input resistance 33 and the output resistance 34 are replaced.

Also in the fourteenth embodiment, the above-mentioned thirteenth embodiment is performed.
Similarly to the above, the input coupler 7 and the output coupler 8 are
By using and, the size of each element for the length of λ / 2, which is required, can be omitted, and a small linear amplifying device capable of gain compensation and phase compensation can be obtained.

Examples 15, 16. Hereinafter, the first aspect of the present invention
The fifth embodiment will be described with reference to the drawings. 20 is a block diagram showing a linear amplifier according to the fifteenth embodiment. Figure 2
0, the same reference numerals as those in FIG. 1 in the first embodiment indicate the same or corresponding portions, 35 is a coupling resistor provided in place of the feedback coupler 9, and 50 is an amplifier.

The linear amplifying apparatus according to the fifteenth embodiment uses the gain compensating circuit of the linear amplifying apparatus according to the first embodiment, instead of the feedback coupler 9 of the gain compensating circuit, with a coupling resistor 35, and has an input terminal. 1 is provided with an amplifier 50 between the input coupler 7 and the input coupler 7, and by providing the amplifier 50, the variable amplifier 6 which is no longer needed is removed.

Also in the fifteenth embodiment, the feedback resistor 9 is used in place of the feedback coupler 9 in the gain compensation circuit of the linear amplifier according to the first embodiment. Therefore, the feedback coupler 9 is used. By using, the size of the element for the length of λ / 2 (λ is the wavelength of the input signal), which is required, can be omitted, and a small linear amplification device capable of gain compensation can be obtained.

The sixteenth embodiment of the present invention will be described below. The linear amplifier according to the sixteenth embodiment is the same as the linear amplifier according to the first embodiment, except that the gain compensation circuit of the linear amplifier according to the second embodiment is used.
The gain compensation circuit according to the fifth embodiment is used.
In the same manner as in the fifteenth embodiment, by using the feedback coupler 9, the size of the element for the length of λ / 2, which is required, can be omitted, and the gain compensation and the phase compensation can be performed. It is possible to obtain a small-sized linear amplification device that can be manufactured.

Examples 17, 18. Hereinafter, the first aspect of the present invention
Example 7 will be described with reference to the drawings. FIG. 21 is a block diagram showing a linear amplifier according to the seventeenth embodiment. Figure 2
20, the same reference numerals as those in FIG. 20 in the fifteenth embodiment indicate the same or corresponding portions, and reference numeral 36 is a coupling capacitor which feeds back only the high frequency component of the feedback signal ATT to the input signal.

The linear amplifying apparatus of the seventeenth embodiment uses the coupling capacitor 36 instead of the coupling resistor 35 used in the gain compensating circuit of the linear amplifying apparatus of the fifteenth embodiment, thereby simply transmitting the ATT signal. Since the feedback is provided, the size of the element corresponding to the length of λ / 2, which is required by using the feedback coupler 9, can be omitted.

The eighteenth embodiment of the present invention uses a coupling capacitor 36 instead of the coupling resistor 35 used in the gain compensating circuit of the linear amplifier according to the sixteenth embodiment. Moreover, the size of the element corresponding to the length of λ / 2 can be omitted.

Furthermore, the size of the element for the length λ / 2 required by using the coupler can be omitted from the circuit of the linear amplifying apparatus, and the above-mentioned Embodiments 9 to 1 can be omitted.
The circuit configuration of No. 8 can be applied to any of the embodiments of the linear amplification device according to the present invention, and even if any of them is applied in an arbitrary combination, the same effect can be obtained. In the phase compensating circuit of the linear amplifying apparatus according to the present invention, instead of the dual gate amplifier 26 used for the means for changing the phase of the input signal by the phase control signal, the above-mentioned Embodiment 15-
By using the coupling resistor 35 or the coupling capacitor 36 used in 18, it is possible to obtain the linear amplification device capable of gain compensation and phase compensation.

Example 19. The nineteenth embodiment of the present invention will be described below with reference to the drawings. 22 is a block diagram showing a linear amplifier according to the nineteenth embodiment. 22, the same reference numerals as those in FIG. 1 in the first embodiment indicate the same or corresponding portions, and 135 is a variable attenuator provided between the amplifier 3 and the amplifier 4 constituting the high output amplifier 500, and 136 is The temperature change of the high-power amplifier 500 is detected,
A temperature sensitive element that changes it into an electric signal, for example, a thermistor. Further, 137 indicates the output of the temperature sensitive element 136,
It is a buffer amplifier that transmits to the variable attenuator 135.

In the linear amplifier of the nineteenth embodiment, the temperature sensitive element 136 is attached to the high output amplifier 500 of the linear amplifier of the first embodiment, and the temperature sensitive element 136 detects the temperature change of the high output amplifier 500. Then, the output obtained by converting it into an electric signal is input to the variable attenuator 135 provided between the amplifier 3 and the amplifier 4 through the buffer amplifier 137, and the attenuation amount for the input signal of the variable attenuator 135 is It is adapted to change according to the output due to the temperature change.

In the nineteenth embodiment, the characteristics of the high output amplifier 500 are changed according to the temperature change during operation.
In addition, the temperature sensing element 13 that changes the temperature change into an electric signal
6, the buffer amplifier 137, and the variable attenuator 1
Since the temperature compensating circuit constituted by 35 and 35 is provided, the gain of the input signal can be changed according to the temperature change of the high output amplifier 500, and the linear amplification that can perform the temperature compensation in addition to the phase compensation. The device can be obtained. Furthermore, the temperature compensating circuit of the nineteenth embodiment can be applied to all the linear amplifying devices of the above-described first to eighteenth embodiments of the present invention.

Example 20. Hereinafter, a twentieth embodiment of the present invention will be described with reference to the drawings. FIG. 23 is a block diagram showing a linear amplifier according to the 20th embodiment. In FIG. 23, the same reference numerals as those in FIG. 1 in the first embodiment indicate the same or corresponding portions, and 145 is a variable attenuator provided between the input coupler 7 and the feedback coupler 9, 146 and 14.
7 is a diode detector, 148 is a variable attenuator, 1
49 is a variable phase shifter, 150 and 151 are video amplifiers, 152 is a dual gate video amplifier, and 153 is a current buffer amplifier.

The linear amplifier of the twentieth embodiment is obtained by adding an envelope detection circuit to the linear amplifier of the first embodiment, and the operation of the phase compensation circuit is as described in the first embodiment. Therefore, the description thereof will be omitted, and the operation of the added envelope detection circuit will be described below. First, a part of the input signal extracted by the input coupler 7 is sent to the variable amplifier 6 and the detector 146,
The envelope is detected by the detector 146.

Further, a part of the output signal taken out by the output coupler 8 is sent to the variable attenuator 14 and the variable attenuator 148, and the power level of the variable attenuator 148 is changed to that of the input signal. The level is made equal, and the phase thereof is finely adjusted by the variable phase shifter 149 so as to be the same as the phase of the input signal. The output signal whose gain and phase have been adjusted is sent to the detector 147, and its envelope is detected.

Next, the envelope signal of the input signal is amplified by the video amplifier 150 and input to one input terminal of the dual gate video amplifier 152. At the same time, the envelope signal of the output signal is amplified by the video amplifier 151 and input to the other input terminal of the dual gate video amplifier 152. Then, in the dual-gate video amplifier 152, the gains of the envelope signals are compared, and if there is a gain difference, the gain difference Vc
Through the current buffer amplifier 153 to the variable attenuator 145
Entered in.

The variable attenuator 145 changes the power amount of the input signal according to the gain difference Vc.

In the twentieth embodiment, the envelope detection circuit is provided in the linear amplifier of the first embodiment, the envelope of the input signal is compared with the envelope of the output signal, and the gain difference is Since the variable attenuator 145 is fed back to the input signal, in addition to the gain compensation of the high frequency signal component of the input signal, the distortion of the modulation signal can be compensated at the same time, and the gain compensation can be performed with high accuracy. An amplification device can be obtained.

The envelope compensating circuit 900 can be applied to any of the linear amplifying devices of the first to nineteenth embodiments.

[0114]

As described above, according to the linear amplifying apparatus of the present invention, a high output amplifier such as a multistage amplifier for amplifying a high frequency input signal is connected to an input coupler connected to the input side of the high output amplifier. Input coupling means for extracting a part of the input signal at
Output coupling means for extracting a part of the output signal by an output coupler or the like connected to the output side of the high-power amplifier, amplitude of the high-frequency input signal extracted by the input coupling means, and output from the output coupler. An input / output coupling means for comparing the amplitude of a high frequency output signal with a hybrid coupler or the like, and outputting the difference between the compared amplitudes as a high frequency feedback signal, and for feedback connected to the input side of the high output amplifier Since the gain compensating circuit configured by the feedback coupling means for feeding back the feedback signal to the input signal with the coupler or the like is provided, the gain of the high frequency input signal amplified by the high output amplifier is adjusted. There is an effect that the distortion of the amplitude of the high frequency signal of the output signal can be compensated and a linear amplifier that outputs the output signal amplified with linearity can be obtained.

Further, according to the linear amplifying apparatus of the present invention, in addition to the linear amplifying apparatus provided with the gain compensating circuit, the phase of the high frequency input signal extracted by the input coupling means and the output coupling are provided. Take out a part of it by means of 90
° A phase detector that detects and compares the phase of a high-frequency output signal whose phase has been adjusted with a phase shifter, and outputs a power signal according to the phase difference, and a power signal output by the phase detector To a high-frequency phase control signal, and a phase control signal generating circuit for outputting the phase control signal, and a dual gate amplifier or the like connected to the input side of the high output amplifier to feed back the phase control signal to the input signal. Since the phase compensation circuit composed of the phase feedback means is provided,
The gain and phase of the high-frequency input signal amplified by the high-power amplifier can be adjusted, the amplitude and phase distortion of the high-frequency signal component of the output signal can be compensated, and the output signal is amplified linearly and its phase is also compensated. There is an effect that it is possible to obtain a linear amplifier that outputs the generated output signal.

Further, according to the linear amplifying apparatus of the present invention, the feedback coupling means includes a feedback coupling means and the like between the input coupling means of the input coupling means and the high output amplifier, and a signal input terminal. Since it has a second feedback coupler connected between the input coupler and the like, a high-frequency feedback signal is inserted also in the preceding stage of the input coupler and the high-frequency signal of the input signal. Minute gain can be finely adjusted, and linearity can be further improved.

According to the linear amplifier of the present invention, the input coupler of the input coupling means and the feedback coupler of the feedback coupling means are provided at the output stage of a predetermined amplifier of the high power amplifiers. Etc., or because the dual gate amplifier of the phase feedback means is connected, the high level of the input signal can be taken in, the signal can be easily processed, and accurate amplitude or phase control can be performed easily. The effect is that you can.

Further, according to the linear amplifying apparatus of the present invention, the gain compensating circuit or the gain compensating circuit and the phase compensating circuit of the linear amplifying apparatus including the gain compensating circuit and the phase compensating circuit are respectively provided with delay circuits. Since it is provided, it is possible to take into account the time delay that occurs while the input signal passes through the high-power amplifier, and it is possible to perform highly accurate amplitude control or amplitude control and phase control in on-time. effective.

Further, according to the linear amplifying apparatus of the present invention, since the gain adjusting dual gate amplifier or the FET is used as the feedback coupling means, the feedback coupling means can have the performance of an amplifier and the input The effect is that feedback can be easily applied to the signal.

Further, according to the linear amplifying device of the present invention, the gain compensating circuit or the linear amplifying device having the gain compensating circuit and the phase compensating circuit is used for the high-frequency wave, a part of which is taken out by the input coupling means. Means for detecting the envelope of the input signal, means for detecting the envelope of the high-frequency output signal, a part of which is taken out by the output coupling means, means for comparing the respective envelopes, and the comparison result Since the input side of the high-power amplifier is provided with an envelope compensation circuit configured by means for changing the attenuation amount of the input signal, distortion in the envelope of the output signal can be compensated, and There is an effect that a highly accurate linear amplification device can be obtained.

Further, according to the linear amplifying apparatus of the present invention, the input signal and the output are obtained by using a resistor or a capacitor for the input coupling means, the output coupling means, the feedback coupling means or the phase feedback means, respectively. Since the signal is pulled in, or the feedback signal or the phase control signal is sent to the input signal, a coupler requiring a half wavelength of the signal to be processed, the dual gate amplifier, or There is an effect that it is possible to obtain a smaller linear amplification device using the above FET.

Further, according to the linear amplifying apparatus of the present invention, the gain compensating circuit or the linear amplifying apparatus including the gain compensating circuit and the phase compensating circuit can be provided in the output stage of a desired amplifier of the high output amplifier. , A temperature attenuator connected to the variable attenuator through a buffer amplifier, which is connected to a variable attenuator that changes the amount of attenuation with respect to the input signal, and whose output changes according to the temperature change of the high output amplifier. Since the circuit is provided, the variable attenuator can adjust the amount of attenuation of the input signal by the signal from the temperature sensitive element according to the temperature change of the high output amplifier, and the gain and phase compensation can be performed. In addition, there is an effect that the temperature characteristic of the high output amplifier can be compensated.

[Brief description of drawings]

FIG. 1 is a block diagram of a linear amplifier according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining distortion that appears on the output side of a linear amplifier.

FIG. 3 is an input / output characteristic diagram of a high-power amplifier in a linear amplifier.

FIG. 4 is a diagram showing the relationship between the power of an input signal and the necessary feedback amount of a signal to be fed back to the input signal in the linear amplification device of the present invention.

FIG. 5 is a diagram showing the relationship between the amplitude difference between the input signal and the output signal and the output of the hybrid coupler in the linear amplification device of the present invention.

FIG. 6 is a configuration diagram of a linear amplifier according to a second embodiment of the present invention.

FIG. 7 is a characteristic diagram of power and phase of an input signal to a high output amplifier in a linear amplifier.

FIG. 8 is a characteristic diagram of the output V1 of the phase detector and the phase difference ΔΦ in the linear amplifier of the present invention.

FIG. 9 is a characteristic diagram of the output V1 of the phase detector and the phase difference ΔΦ in the linear amplifier of the present invention.

FIG. 10 is a characteristic diagram of the output V1 of the phase detector and the output P'in of the phase control generation circuit in the linear amplifier of the present invention.

FIG. 11 is a characteristic diagram of the phase control signal P′in and the phase shift Δφ in the linear amplifier of the present invention.

FIG. 12 is a specific characteristic diagram of a dual gate amplifier in the linear amplification device of the present invention.

FIG. 13 is a block diagram of a linear amplifier according to a third embodiment of the present invention.

FIG. 14 is a block diagram of a linear amplifier according to a fourth embodiment of the present invention.

FIG. 15 is a block diagram of a linear amplification device according to a fifth embodiment of the present invention.

FIG. 16 is a block diagram of a linear amplifier according to a seventh embodiment of the present invention.

FIG. 17 is a block diagram of a linear amplifier according to a ninth embodiment of the present invention.

FIG. 18 is a block diagram of a linear amplification device according to an eleventh embodiment of the present invention.

FIG. 19 is a block diagram of a linear amplification device according to a thirteenth embodiment of the present invention.

FIG. 20 is a block diagram of a linear amplification device according to a fifteenth embodiment of the present invention.

FIG. 21 is a block diagram of a linear amplification device according to a seventeenth embodiment of the present invention.

FIG. 22 is a block diagram of a linear amplification device according to a nineteenth embodiment of the present invention.

FIG. 23 is a block diagram of a linear amplification device according to a twentieth embodiment of the present invention.

FIG. 24 is a block diagram of a conventional linear amplification device.

[Explanation of symbols]

 1 Input Terminal 2 Output Terminal 3-5 Amplifier 6 Variable Amplifier 7 Input Coupler 8 Output Coupler 9 Feedback Coupler 10 Isolator 11, 12 Variable Phase Shifter 13, 14 Variable Attenuator 15 Hybrid Coupler 16-19 Termination 20 Phase control signal generation circuit 21 Variable amplifier 22 90 ° phase shifter 23 Variable attenuator 24 Reference voltage source 25 Phase detector 26 Dual gate amplifier 27 Delay line 28 Feedback dual gate amplifier 29 Input matching circuit 30 FET 31 Source impedance 32 Output Matching circuit 33 Input resistance 34 Output resistance 35 Coupling resistance 36 Coupling capacitor 38, 39 Envelope detector 40 Power control circuit 41 Amplifier 42 Buffer amplifier 43 Difference signal generator 44 Voltage circuit 45 Amplifier 46 Termination 47 Second feedback coupler 48 variable phase shifter 49 variable attenuation 50 amplifier 135 variable attenuator 136 temperature sensitive element 137 buffer amplifier 145 variable attenuator 146, 147 wave detector 148 variable attenuator 149 variable phase shifter 150, 152 video amplifier 153 high output amplifier 600 gain compensation circuit 610 input Coupling means 620 Output coupling means 630 Input / output coupling means 640 Feedback coupling means 700 Phase compensation circuit 730 Phase control means 740 Phase feedback means 800 Temperature compensation circuit 900 Envelope compensation circuit

Claims (16)

[Claims] 1. A linear amplifier having a high-power amplifier for amplifying a high-frequency input signal, wherein input coupling means for extracting a part of the input signal at the input side of the high-power amplifier, and output of the high-power amplifier. The output coupling means for extracting a part of the output signal on the side, the amplitude of the high frequency input signal extracted by the input coupling means, and the amplitude of the high frequency output signal extracted by the output coupling means are compared. A gain compensation circuit having an input / output coupling means for outputting the compared amplitude difference as a high-frequency feedback signal and a feedback coupling means for feeding the feedback signal back to the input signal at the input side of the high-power amplifier is provided. A linear amplification device characterized in that 2. The linear amplifying device according to claim 1, wherein the phase of the high frequency input signal extracted by the input coupling means and the high frequency output signal extracted by the output coupling means. And a phase control means for generating a high frequency phase control signal according to the phase difference, and feeding back the phase control signal to the input signal at the input side of the high output amplifier. A linear amplifier comprising a phase compensation circuit having a phase feedback means. 3. The linear amplification device according to claim 1, wherein the input coupling means has an input coupler connected between a signal input terminal and the high power amplifier, and the output coupling means. Has an output coupler connected between the high-power amplifier and a signal output terminal, the input / output coupling means has a hybrid coupler, and the feedback coupling means has the input coupler and the input coupler. A linear amplifier having a feedback coupler connected to a high-power amplifier. 4. The linear amplifying device according to claim 2, wherein the phase control means is a 90 ° phase shifter for shifting the phase of the extracted high frequency output signal by 90 °, and the phase and the extracted high frequency. A phase detector that detects the phase of the input signal and outputs a power signal according to the phase difference,
A phase control signal generating circuit for converting the power signal output from the phase detector into a phase control signal and outputting the phase control signal, wherein the phase feedback means is connected between the input coupler and the high output amplifier. A linear amplifying device having a dual gate amplifier having a substantially constant gain and changing a phase in a predetermined operating range. 5. The linear amplifying device according to claim 1, wherein the feedback coupling means is connected between a portion for extracting the input signal of the input coupling means and the high output amplifier. A linear amplifying device comprising: a coupler, a signal input terminal, and a second feedback coupler connected between a portion of the input coupling means for extracting the input signal. 6. The linear amplification device according to claim 1, wherein the high-power amplifier is a multi-stage amplifier having a plurality of amplifiers, and a portion for extracting a part of the input signal of the input coupling means and the feedback. A linear amplifying device, wherein a portion of the coupling means for feeding back the feedback signal to the input signal is at an output stage of a predetermined one of the high output amplifiers. 7. The linear amplification device according to claim 2, wherein the high-power amplifier is a multi-stage amplifier having a plurality of amplifiers, and a portion for extracting a part of the input signal of the input coupling means and the feedback. A portion of the coupling means for returning the feedback signal to the input signal and a portion of the phase feedback means for returning the phase control signal to the input signal are provided in an output stage of a predetermined amplifier of the high output amplifiers. A linear amplification device characterized by being. 8. The linear amplifying device according to claim 1, wherein a delay circuit is inserted in the middle of a path for sending the input signal extracted by the input coupling means to the input / output coupling means. Amplification device. 9. The linear amplifying device according to claim 2, wherein the input signal extracted by the input coupling means is provided on the way to the input / output coupling means and on the way to the phase control means. , A linear amplifying device having a delay circuit inserted therein. 10. The linear amplifying device according to claim 1, wherein the feedback coupling means is connected between a portion of the input coupling means for extracting the input signal and the high power amplifier.
A linear amplification device having a dual gate amplifier for gain adjustment, which has a substantially constant phase in a predetermined operation range and changes a gain. 11. The linear amplification device according to claim 1, wherein the feedback coupling means is connected between a portion of the input coupling means for extracting the input signal and the high-power amplifier,
A field effect transistor (hereinafter referred to as an FET) to which the feedback signal is input to its source terminal grounded via a source impedance, and an input matching circuit connected to its gate terminal and to which the input signal is input, A linear amplifier having an output matching circuit connected to a drain terminal. 12. The linear amplification device according to claim 1, wherein the input coupling means detects a part of an envelope of a high-frequency input signal extracted by the input coupling means, and the output coupling means partially detects the envelope. Means for detecting the envelope of the extracted high-frequency output signal, means for comparing the envelope of the detected input signal with the envelope of the detected output signal, and the high-power amplifier A linear amplification device comprising an envelope compensation circuit having means for changing the amount of attenuation of the input signal on the input side of the. 13. The linear amplifying device according to claim 1, wherein the input coupling unit has a resistor or a capacitor that pulls in the input signal, and the output coupling unit has a resistor that pulls in the output signal. Alternatively, a linear amplification device having a capacitor. 14. The linear amplification device according to claim 1, wherein the feedback coupling means has a resistor or a capacitor for feeding the feedback signal to the input signal. 15. The linear amplifying device according to claim 2, wherein the feedback coupling means has a resistor or a capacitor for feeding the feedback signal to the input signal, and the phase feedback means applies the input signal to the feedback signal. A linear amplifying device having a resistor or a capacitor for feeding a phase control signal. 16. The linear amplifying device according to claim 1, wherein the high-power amplifier is a multistage amplifier having a plurality of amplifiers, and the high-power amplifier is connected to an output stage of a desired amplifier of the high-power amplifier, A temperature compensating circuit having a variable attenuator that changes the amount of attenuation with respect to an input signal, and a temperature sensitive element that is connected to the variable attenuator through a buffer amplifier and whose output changes according to the temperature change of the high output amplifier A linear amplification device characterized by being provided.