JP2000349565A - Power amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a loss and distortion power without a linearizer by making at least one unit amplifier in plural unit amplifiers and the other unit amplifiers have positive/negative gain respectively with respect to the power variation of an input signal and respectively amplifying distributed input so as to put power together. SOLUTION: A power distribution device 32 distributes the power of the input signal of an input terminal and an amplifying means constituted of unit amplifiers 34, 35 amplifies the signal. At this time, the unit amplifier 34 has the gain characteristics of 0.05 dB increase per power increase of 1 dB of the input signal and the amplifer 35 similarly has the reduced gain characteristics of 0.05 dB. A power device 36 puts those amplified signals together and outputs it from an output terminal 37. The power distributor and the device 36 are direcrtional couplers of the ratio of 3 dB without loss. Thus, gain variation is suppressed to the level of 0.002 dB so that distortion is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power amplifier.

[0002]

2. Description of the Related Art FIG. 18 is a block diagram showing a conventional balanced amplifier shown in, for example, a microwave semiconductor circuit "by Kazuhiko Honjo, published by Nikkan Kogyo Shimbun, September 24, 1993, p. 140". In the drawing, 1 is an input terminal, 2 is a terminator having one end grounded, 3 is a branch type coupler for distributing an input signal from the input terminal 1 having a distribution ratio of 3 dB, and 4, 5 are for power distribution. A unit amplifier for amplifying the input signal, a branch type coupler for power combining the amplified signal, a terminator having one end grounded, and an output terminal.

Next, the operation will be described. The branch coupler 3 distributes the power of the input signal from the input terminal 1 with a distribution ratio of 3 dB. At this time, the terminator 2 cancels the input signal reflected by the branch coupler 3. The unit amplifiers 4 and 5 amplify the power-divided input signals, respectively. The branch-type coupler 6 performs power combining of the amplified signals and outputs the combined signal to the output terminal 8. At this time, the terminator 7 cancels the output signal reflected by the branch coupler 6. In such a power amplifier,
At the same time that the power of the desired wave is synthesized, the unit amplifiers 4, 5
The generated distortion power is also synthesized and output from the output terminal 8.

FIG. 19 is a block diagram showing a conventional power amplifying device of a television relay broadcaster disclosed in Japanese Patent Application Laid-Open No. Hei 5-218926. In the figure, reference numeral 11 denotes a filter for filtering an input signal; Is a reception converter, 13 is a transmission converter, 14 is a power divider that distributes the power of the transmission-converted signal, and 15 and 16 are power amplifiers that amplify the power-divided input signal. 15a
Is a power amplifier for amplifying an input signal, and 15b is a self-adjusting feedforward nonlinear distortion compensation circuit. Reference numeral 17 denotes a combiner for power-combining the amplified signal, and reference numeral 18 denotes a filter for filtering and outputting the power-combined signal.

Next, the operation will be described. The input signal is
Filter 11, reception converter 12, and transmission converter 13
After the transmission conversion, the signal is distributed by the distributor 14.
The power amplifying devices 15 and 16 amplify the distributed signals by the power amplifier 15a whose distortion is compensated by the self-adjustment type feedforward nonlinear distortion compensating circuit 15b. Synthesizer 17
Power-combines the amplified signals, and the filter 18 filters and outputs the power-combined signal. In such a power amplifying device, at the same time that the power of the desired wave is combined, the remaining non-linear distortion that cannot be completely compensated for by the power amplifying devices 15 and 16 is also combined.
Is output.

FIG. 20 is a block diagram showing a conventional distortion compensating circuit disclosed in, for example, Japanese Patent Laid-Open No. 4-47804. In the figure, reference numeral 21 denotes an input terminal; A hybrid for distribution, 23 is a linearizer for compensating for non-linearity, and 24 and 25 are power distributed by the hybrid 22, one of which is a linearizer 23.
A power amplifier for amplifying the microwave signal transmitted through the power amplifier; 26, a combiner for canceling distortion components of the microwave signal amplified by the power amplifiers 24, 25; and 27, an output terminal.

Next, the operation will be described. The hybrid 22 divides the microwave signal from the input terminal 21 into two equal parts. The linearizer 23 compensates for the non-linearity of the power amplifiers 24 and 25. The power amplifier 24 is distributed by the hybrid 22 and the linearizer 2
3. Amplify the microwave signal through 3. Further, the power amplifier 25 amplifies the microwave signal to which power has been distributed by the hybrid 22. The combiner 26 combines the microwave signals amplified by the power amplifiers 24 and 25 and outputs the combined signal from an output terminal 27. Here, linearizer 2
3, the level of the distortion compensating component generated from the linearizer 23 is adjusted to a level larger than the level of the distortion component generated from the power amplifier 24. As a result, the outputs of the power amplifiers 24 and 25 are in the form of overcompensation, and the components of the overcompensation and the original distortion components of the power amplifiers 24 and 25 are canceled at the output of the combiner 26. In such a power amplifying device, the linearizer 23 must be provided. Further, since the linearizer 23 is provided only in one of the power amplifiers 24 and 25, a large passing phase difference occurs between the path provided with the linearizer 23 and the path not provided with the linearizer 23, and the combining by the combiner 26 is performed. Later, large losses occur.

[0008]

Since the conventional power amplifying device is constructed as described above, FIGS.
In the device shown in FIG. 2, unit amplifiers 4 and 5 having the same characteristics are used.
And the output powers of the power amplifying devices 15 and 16 with self-adjustment type feed-forward nonlinear distortion compensating circuits, so that the distorted power generated by the amplifier is also combined and the ratio of the distorted power to the power of the desired wave is reduced. There was a problem that could not be done. In the apparatus shown in FIG. 20, the linearizer 23 must be provided, which complicates the configuration. Further, since the linearizer 23 is provided only in one of the power amplifiers 24 and 25, the linearizer 23 is provided. A large passing phase difference occurs between the path provided with the linearizer 23 and the path provided with no linearizer 23, and a large loss occurs after the combining by the combiner 26. Furthermore, since the power amplifier 24 provided with the linearizer 23 and the power amplifier 25 not provided with the linearizer 23 have different output amplitudes and phase change amounts with respect to the passing phase of the small signal, the combiner 2
There is a problem that a large loss occurs after the synthesis according to No. 6.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and does not require the provision of a linearizer.
It is an object of the present invention to obtain a power amplifying device that reduces a loss and a distortion power.

[0010]

A power amplifying apparatus according to the present invention has a gain characteristic in which one or more unit amplifiers and another unit amplifier have different signs with respect to a change in power of an input signal. , Amplifying means for amplifying the input signal distributed by the power distributing means, and power combining means for power combining the amplified signals.

The power amplifying device according to the present invention has one or more unit amplifiers and other unit amplifiers having phase characteristics of mutually different signs with respect to power change of an input signal,
It comprises an amplifying means for amplifying the input signal distributed by the power distribution means, and a power combining means for power combining the amplified signals.

According to the power amplifying apparatus of the present invention, at least one unit amplifier and another unit amplifier have gain characteristics and phase characteristics having different signs with respect to the power change of the input signal, and the power distribution is different. Amplifying means for amplifying the input signal distributed by the means, and power combining means for power combining the amplified signals.

[0013] In the power amplifying apparatus according to the present invention, the amplifying means includes a gain control circuit having a gain characteristic that increases with an increase in the power of the input signal, and a plurality of unit amplifiers.

In the power amplifying apparatus according to the present invention, the amplifying means includes a phase control circuit having a phase characteristic of a phase delayed with respect to an increase in the power of the input signal, and a plurality of unit amplifiers.

[0015] In the power amplifying apparatus according to the present invention, the amplifying means comprises a gain phase control circuit having a gain characteristic and a lag phase characteristic that increase with an increase in power of the input signal, and a plurality of unit amplifiers. It is.

In the power amplifying apparatus according to the present invention, the power combining means comprises a plurality of antennas which radiate an electromagnetic wave corresponding to a signal amplified by the amplifying means to a space and perform power combining in the space.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a configuration diagram showing a power amplifying device according to Embodiment 1 of the present invention. In the figure, reference numeral 31 denotes an input terminal, and 32 denotes a power distributor (power distribution means) which distributes an input signal from the input terminal 31 to power. , 33 are amplifying means. In the amplifying means 33, 34 is an input signal 1d.
The unit amplifier 35 has a gain characteristic of increasing 0.05 dB with respect to the power increase of B, and the unit amplifier 35 has a gain characteristic of decreasing 0.05 dB with respect to the power increase of 1 dB of the input signal. 36 is a power combiner (power combining means) for combining the signals amplified by the unit amplifiers 34 and 35, and 37 is an output terminal.

Next, the operation will be described. Power distributor 3
2 distributes the power of the input signal from the input terminal 31. In the amplifying means 33, the unit amplifier 34 receives one of the input signals.
It has a gain characteristic of an increase of 0.05 dB with respect to an increase of power of dB, and amplifies a power-divided input signal. Also, the unit amplifier 35 has a gain characteristic of decreasing by 0.05 dB with respect to a 1 dB increase in power of the input signal, and amplifies the power-divided input signal. The power combiner 36 includes the unit amplifier 3
The powers of the signals amplified by the signals 4 and 35 are combined and output from the output terminal 37.

FIG. 2 is a characteristic diagram showing gain characteristics and phase characteristics of the unit amplifier according to the first embodiment of the present invention.
FIG. 2A shows the gain characteristics and the phase characteristics of the unit amplifier 34, and FIG. 2B shows the gain characteristics and the phase characteristics of the unit amplifier 35. As can be seen from FIG.
The unit amplifiers 34 and 35 have the same gain characteristics having different signs with respect to the power change of the input signal, and the unit amplifier 34 has a gain of 0.1 dB when the power of the input signal increases by 1 dB.
It has a gain characteristic of an increase of
5 is 0.05 dB for a 1 dB power increase of the input signal.
It has a gain characteristic of decreasing B. Here, the power divider 32 and the power combiner 36 have a lossless 3 dB.
Directional coupler. FIG. 3 is a characteristic diagram showing a gain characteristic and a phase characteristic obtained by calculating the output power of the output terminal with respect to the input power of the input terminal according to the first embodiment of the present invention. As can be understood from FIG. Gain change is 0.002d for 1dB increase of
It can be seen that the surface is flattened to about B and the distortion is reduced.

In the first embodiment, the case where the number of the unit amplifiers is two is shown. However, even when the number of the unit amplifiers is three or more, the same result can be obtained by combining the unit amplifiers having the opposite gain changes. can get. Further, in the first embodiment, a lossless directional coupler having a ratio of 3 dB is used for the power divider 32 and the power combiner 36. However, a Wilkinson power divider, a Wilkinson power combiner, or the like may be used. Similar results are obtained. Further, in general, GaAsF
An amplifier using an ET, MOSFET, Si-BJT, or HBT often has a characteristic that a gain decreases with an increase in input power. Therefore, an amplifier having an increased gain is realized by adjusting the load condition and bias condition of the amplifier. At this time, the adjustment is performed so as to obtain the above-described characteristics, and the adjustment is performed so that the passing phases of the minute signals with respect to the input signal are equalized between the amplifiers.

As described above, according to the first embodiment, as the unit amplifiers 34 and 35, those having gain characteristics having different signs with respect to the power change of the input signal are used. The gain change is flattened in response to the change, and the loss and the distortion power can be reduced without providing a linearizer.

Embodiment 2 FIG. The second embodiment is similar to FIG.
At 0.3 dB for a 1 dB power increase of the input signal.
A unit amplifier 34 having a phase characteristic of the leading phase of deg
And 0.3 deg for 1 dB power increase of the input signal
And a unit amplifier 35 having a phase characteristic of the lag phase. Other configurations are the same as those in FIG.

Next, the operation will be described. FIG. 4 is a characteristic diagram showing a gain characteristic and a phase characteristic of the unit amplifier according to the second embodiment of the present invention, and FIG.
4 shows the gain characteristic and the phase characteristic, and FIG. 4B shows the gain characteristic and the phase characteristic of the unit amplifier 35. As can be understood from FIG. 4, the unit amplifiers 34 and 35 have the same phase characteristics having different signs with respect to the power change of the input signal.
B has a phase characteristic of a leading phase of 0.3 deg with respect to an increase in power of B, and the unit amplifier 35 outputs 1 dB of the input signal.
Has a phase characteristic of a lag phase of 0.3 deg with respect to the power increase. Here, the power distributor 32 and the power combiner 36 are directional couplers having a lossless ratio of 3 dB. FIG. 5 is a characteristic diagram showing a gain characteristic and a phase characteristic obtained by calculating the output power of the output terminal with respect to the input power of the input terminal according to the second embodiment of the present invention. As can be understood from FIG. It can be seen that the phase change is almost flattened with respect to the increase of 1 dB, and the distortion is reduced.

In the second embodiment, the case where the number of the unit amplifiers is two is shown. However, even when the number of the unit amplifiers is three or more, the same result can be obtained by combining the unit amplifiers having the opposite phase changes. can get. Further, in the second embodiment, a lossless directional coupler having a ratio of 3 dB is used for the power divider 32 and the power combiner 36, but a Wilkinson power divider, a Wilkinson power combiner, or the like may be used. Similar results are obtained. Further, in general, GaAsF
An amplifier using ET, MOSFET, Si-BJT, or HBT often has a characteristic that the phase advances with an increase in input power. Therefore, an amplifier with a delayed phase is realized by adjusting the load condition and bias condition of the amplifier. At this time, while adjusting to obtain the above characteristics,
Adjustment is performed so that the passing phase of the small signal with respect to the input signal is made equal between the amplifiers. Further, in the second embodiment, the gain characteristics of the unit amplifiers 34 and 35 are shown in FIG.
Although both are set to 0 dB as shown in (a) and (b), the gain characteristics of the unit amplifiers 34 and 35 may be different from each other.

As described above, according to the second embodiment, as the unit amplifiers 34 and 35, those having the same phase characteristics having different signs with respect to the power change of the input signal are used. There is an effect that the phase change is flattened with respect to the change in the input power, the loss can be reduced without providing a linearizer, and the distortion power can be reduced.

Embodiment 3 FIG. The third embodiment is different from the one shown in FIG.
At 0.0 dB for a 1 dB power increase of the input signal.
A unit amplifier 34 having a gain characteristic of a decrease of 5 dB and a phase characteristic of a lead phase of 0.3 deg,
A unit amplifier 35 having a gain characteristic of an increase of 0.05 dB with respect to an increase of power of dB and a phase characteristic of a delay phase of 0.3 deg is used. Other configurations are the same as those in FIG.

Next, the operation will be described. FIG. 6 is a characteristic diagram showing a gain characteristic and a phase characteristic of a unit amplifier according to Embodiment 3 of the present invention, and FIG.
4 shows the gain characteristic and the phase characteristic, and FIG. 6B shows the gain characteristic and the phase characteristic of the unit amplifier 35. As can be understood from FIG. 6, the unit amplifiers 34 and 35 have the same gain characteristic and phase characteristic having different signs with respect to the power change of the input signal.
It has a gain characteristic of a decrease of 0.05 dB with respect to a power increase of 1 dB of the input signal, and a phase characteristic of a lead phase of 0.3 deg.
Has a gain characteristic of an increase of 0.05 dB and a phase characteristic of a lag phase of 0.3 deg with respect to the increase in power. Here, the power distributor 32 and the power combiner 36
Is a lossless directional coupler with a 3 dB ratio. FIG.
FIG. 7 is a characteristic diagram showing gain characteristics and phase characteristics obtained by calculating output power of an output terminal with respect to input power of an input terminal according to Embodiment 3 of the present invention. As can be understood from FIG. 7, 1 dB of input power is shown. The change in gain is about 0.01 dB and the change in phase is 0.15 deg.
It can be seen that the surface is flattened to a degree and the distortion is reduced.

In the third embodiment, the case where the number of the unit amplifiers is two is described. However, even when the number of the unit amplifiers is three or more, the same can be obtained by combining the unit amplifiers having the opposite gain and phase changes. Is obtained. Further, in the third embodiment, a lossless directional coupler having a ratio of 3 dB is used for the power divider 32 and the power combiner 36. However, a Wilkinson power divider, a Wilkinson power combiner, or the like may be used. Similar results are obtained. Further, in general, GaAsFETs, MOSFETs, Si-BJTs,
An amplifier using an HBT often has a characteristic that a gain decreases and a phase advances with an increase in input power. Therefore,
By adjusting the load condition and bias condition of the amplifier, an amplifier having an increased gain and a delayed phase is realized. At this time, the adjustment is performed so as to obtain the above-described characteristics, and the adjustment is performed so that the passing phases of the minute signals with respect to the input signal are equalized between the amplifiers.

As described above, according to the third embodiment, as the unit amplifiers 34 and 35, those having the same gain characteristic and phase characteristic having different signs with respect to the power change of the input signal are used. Therefore, the gain change and the phase change with respect to the change in the input power are flattened, and the loss and the distortion power can be reduced without providing a linearizer.

Embodiment 4 FIG. 8 is a configuration diagram showing a power amplifying device according to a fourth embodiment of the present invention. In the drawing, reference numerals 38 and 39 are provided in place of the power combiner 36, and are amplified by unit amplifiers 34 and 35. This is a directional antenna (antenna) that radiates an electromagnetic wave corresponding to a received signal to a space and performs power combining in the space. Other configurations are the same as those in FIG.

Next, the operation will be described. Unit amplifier 3
4 and 35, as described in the first embodiment, have gain characteristics of 0.05 dB increase and decrease with respect to 1 dB power increase of the input signal, and amplify the power-divided input signal. The directional antennas 38 and 39 are unit amplifiers 34 and 3
The electromagnetic wave corresponding to the signal amplified by 5 is radiated into space, and power is synthesized in space. FIG. 9 is a characteristic diagram showing a gain characteristic and a phase characteristic obtained by calculating output power of an output terminal with respect to input power of an input terminal according to a fourth embodiment of the present invention. In FIG. , The sum of the power at the two transmitting antenna ends was calculated. As can be understood from FIG. 9, it can be seen that the gain change is flattened to about 0.002 dB with respect to the increase of the input power by 1 dB, and the distortion is reduced.

Further, as shown in the second embodiment, the unit amplifiers 34 and 35 have a lead and delay phase characteristic of 0.3 deg with respect to a 1 dB power increase of the input signal.
The power-divided input signal may be amplified, and the directional antennas 38 and 39 may radiate an electromagnetic wave corresponding to the signal amplified by the unit amplifiers 34 and 35 to a space and perform power combining in the space. good. FIG. 10 is a characteristic diagram showing a gain characteristic and a phase characteristic obtained by calculating output power of an output terminal with respect to input power of an input terminal according to a fourth embodiment of the present invention.
The sum of the power at the two transmitting antenna ends was calculated in consideration of the transmitting and receiving antenna gain and the like. As can be seen from FIG. 10, it can be seen that the phase change is almost flattened and the distortion is reduced with an increase of 1 dB in the input power.

Further, as shown in the third embodiment, the unit amplifiers 34 and 35 have a gain characteristic of increasing and decreasing by 0.05 dB with respect to a power increase of 1 dB of the input signal, and have a 0.3 deg gain characteristic. It has phase characteristics of lag and lead, and amplifies the power-divided input signal.
The electromagnetic wave corresponding to the signal amplified by 5 may be radiated to the space, and the power may be synthesized in the space. FIG. 11 is a characteristic diagram showing gain characteristics and phase characteristics obtained by calculating output power of an output terminal with respect to input power of an input terminal according to a fourth embodiment of the present invention. , The sum of the power at the two transmitting antenna ends was calculated. As can be understood from FIG. 11, the gain change is about 0.01 dB and the phase change is 0.15 deg for an increase of 1 dB in the input power.
It can be seen that the surface is flattened to a degree and the distortion is reduced.

As described above, according to the fourth embodiment, instead of the power combiner 36, an electromagnetic wave corresponding to the signal amplified by the unit amplifiers 34 and 35 is radiated to the space,
Since the directional antennas 38 and 39 that combine power in space are used, there is an effect that the loss due to the power combiner 36 can be eliminated.

Embodiment 5 FIG. FIG. 12 is a block diagram showing a power amplifying apparatus according to Embodiment 5 of the present invention. In the figure, reference numeral 40 denotes amplifying means, and in the amplifying means 40, 41 denotes a gain for controlling the gain of the power-divided signal. It is a control circuit. 42 is a directional coupler for branching the power-divided signal, 43 is a detection circuit for detecting the branched signal, and 44 is a variable attenuator 45 according to the detected signal.
Control circuit. Other configurations are the same as those in FIG.

Next, the operation will be described. Amplifying means 40
, One of the power-divided signals is input to a gain control circuit 41, a directional coupler 42 branches the power-divided signal, and a detection circuit 43 detects the branched signal. Further, the control circuit 44 controls the variable attenuator 45 according to the detected signal. The unit amplifier 34
It has a gain characteristic of 0.05 dB increase with respect to 1 dB power increase of the input signal, and amplifies the power-divided input signal. Also, the unit amplifier 35 has a gain characteristic of decreasing by 0.05 dB with respect to a 1 dB increase in power of the input signal, and amplifies the power-divided input signal. The power combiner 36
The signals amplified by the unit amplifiers 34 and 35 are power-combined and output from the output terminal 37.

In general, an amplifier using a BJT or FET has a characteristic that the gain decreases with an increase in input power.
Therefore, a gain control circuit 41 controlled to reduce the attenuation of the variable attenuator 45 as the input power increases,
By using the unit amplifier 34 in combination, an amplifier having a characteristic that the gain increases with an increase in the input power is obtained. By using the obtained amplifier having the characteristic of increasing the gain and the amplifier including the unit amplifier 35 of decreasing the gain in combination, the gain characteristic is flattened as shown in the first embodiment. can do. At this time, the passing phase of the minute signal with respect to the input signal is aligned between the unit amplifier 35 and the unit amplifier 34 via the gain control circuit 41. Although the gain control is performed only on one unit amplifier 34 in the fifth embodiment, the gain control may be performed on a plurality of unit amplifiers.

As described above, according to the fifth embodiment, by using the unit amplifier 34 in combination with the gain control circuit 41, it is possible to obtain an amplifier having a characteristic that the gain increases with an increase in input power. And a unit amplifier 35 having a characteristic that the gain decreases with an increase in the input power.
By combining the above, there is an effect that the gain characteristic can be flattened accurately and the distortion power can be effectively reduced.

Embodiment 6 FIG. FIG. 13 is a block diagram showing a power amplifying apparatus according to Embodiment 6 of the present invention. In the figure, reference numeral 50 denotes an amplifying means. It is a control circuit. Reference numeral 52 denotes a directional coupler that splits the power-divided signal, 53 denotes a detection circuit that detects the split signal, and 54 denotes a control circuit that controls a phase shifter 55 according to the detected signal. Other configurations are the same as those in FIG.

Next, the operation will be described. Amplifying means 50
In, one of the power-divided signals is input to a phase control circuit 51, a directional coupler 52 branches the power-divided signal, and a detection circuit 53 detects the branched signal. Further, the control circuit 54 controls the phase shifter 55 according to the detected signal. The unit amplifier 34 has a phase characteristic of a leading phase of 0.3 deg with respect to a power increase of 1 dB of the input signal, and amplifies the power-divided input signal. In addition, the unit amplifier 35 has a phase characteristic of a delay phase of 0.3 deg with respect to a 1 dB power increase of the input signal, and amplifies the power-divided input signal. Power combiner 3
6 synthesizes the power of the signals amplified by the unit amplifiers 34 and 35 and outputs the synthesized signal from the output terminal 37.

In general, an amplifier using a BJT or FET has a characteristic that the phase advances with an increase in input power. Therefore, by using the phase control circuit 51 controlled so that the phase is delayed by the phase shifter 55 as the input power increases and the unit amplifier 34, the phase is delayed with respect to the increase in the input power. Obtain an amplifier. An amplifier having the characteristic of delaying the phase obtained in this way;
By using in combination with the amplifier including the unit amplifier 35 whose phase advances, the phase characteristics can be flattened as described in the first embodiment. At this time, the passing phase of the minute signal with respect to the input signal is aligned between the unit amplifier 35 and the unit amplifier 34 through the phase control circuit 51. In the sixth embodiment, the phase control is performed on only one unit amplifier 34.
Phase control may be performed on a plurality of unit amplifiers.

As described above, according to the sixth embodiment, by using the unit amplifier 34 in combination with the phase control circuit 51, it is possible to obtain an amplifier having a characteristic that the phase is delayed with an increase in input power. In addition, the combination with the unit amplifier 35 having a characteristic in which the phase advances with an increase in the input power can flatten the phase characteristic with high accuracy and effectively reduce the distortion power.

Embodiment 7 FIG. FIG. 14 is a block diagram showing a power amplifying apparatus according to Embodiment 7 of the present invention. In the figure, reference numeral 60 denotes amplifying means, and in the amplifying means 60, 61 controls the gain and phase of the power-divided signal. 62 is a directional coupler that splits the power-divided signal, 63 is a detection circuit that detects the split signal, 64 is a variable attenuator 65 and 64 that changes according to the detected signal. This is a control circuit for controlling the phase shifter 66. Other configurations are the same as those in FIG.

Next, the operation will be described. Amplifying means 60
In, one of the power-divided signals is input to a gain-phase control circuit 61, a directional coupler 62 branches the power-divided signal, and a detection circuit 63 detects the branched signal. Further, the control circuit 64 controls the variable attenuator 65 and the phase shifter 66 according to the detected signal. The unit amplifier 34 has a gain characteristic of a decrease of 0.05 dB with respect to a power increase of 1 dB of the input signal, and 0.3 dB.
It has the phase characteristic of the leading phase of eg and amplifies the power-divided input signal. Also, the unit amplifier 35 has a gain characteristic of an increase of 0.05 dB with respect to a power increase of 1 dB of the input signal, and a phase characteristic of a delay phase of 0.3 deg,
The power-divided input signal is amplified. Power combiner 36
Power-combines the signals amplified by the unit amplifiers 34 and 35 and outputs the resultant signal from the output terminal 37.

In general, an amplifier using a BJT or FET has a characteristic that a gain decreases and a phase advances with an increase in input power. Therefore, the gain / phase control circuit 6 is controlled so that the attenuation of the variable attenuator 65 decreases as the input power increases, and the phase is shifted by the phase shifter 66.
By using 1 and the unit amplifier 34 in combination,
An amplifier having a characteristic that the gain increases and the phase lags with the increase in the input power is obtained. By using an amplifier having the characteristic of increasing the gain and delaying the phase obtained in this way and an amplifier composed of the unit amplifier 35 having a decreased gain and advanced phase, as shown in the first embodiment, , Gain characteristics and phase characteristics can be flattened. At this time, the passing phase of the minute signal with respect to the input signal is aligned between the unit amplifier 35 and the unit amplifier 34 via the gain phase control circuit 61. In the sixth embodiment, the gain / phase control is performed on only one unit amplifier 34. However, the gain / phase control may be performed on a plurality of unit amplifiers.

As described above, according to the seventh embodiment, by using the gain phase control circuit 61 in combination with the unit amplifier 34, the gain is increased and the phase is delayed with an increase in the input power. An amplifier can be obtained, and the gain characteristic and the phase characteristic can be accurately flattened with a combination with the unit amplifier 35 having a characteristic in which the gain decreases and the phase advances with the increase in the input power,
There is an effect that the distortion power can be effectively reduced.

Embodiment 8 FIG. 15 to 17 are configuration diagrams showing a power amplifying device according to an eighth embodiment of the present invention. In the drawings, reference numerals 38 and 39 are provided in place of the power combiner 36, and the unit amplifiers 34 and 35 are provided. This is a directional antenna (antenna) that radiates an electromagnetic wave corresponding to the signal amplified by the antenna into a space and performs power synthesis in the space. Other configurations are the same as those in FIGS. 12 to 14, and thus redundant description will be omitted.

Next, the operation will be described. 15, as shown in the fifth embodiment, unit amplifiers 34 and 35 provide 0.05 dB for a 1 dB increase in power of an input signal.
It has gain characteristics of increasing and decreasing B, and amplifies a power-divided input signal. The directional antennas 38 and 39 radiate an electromagnetic wave corresponding to the signal amplified by the unit amplifiers 34 and 35 to a space and perform power combining in the space. Therefore, the gain change is flattened with an increase in the input power, so that the distortion can be reduced and the loss due to the power combiner 36 can be eliminated.

In FIG. 16, the unit amplifiers 34,
35, 1d of the input signal as shown in the sixth embodiment.
It has a phase characteristic of 0.3 deg for the power increase of B and has a phase characteristic of 0.3 deg, amplifies the power-divided input signal, and is amplified by the unit amplifiers 34 and 35 by the directional antennas 38 and 39. An electromagnetic wave according to a signal may be radiated into space, and power may be synthesized in space.
Therefore, the phase change is flattened in response to the increase in the input power, and the distortion can be reduced.
6 can be eliminated.

Further, in FIG.
As described in the seventh embodiment, the fourth and the fourth have a gain characteristic of increasing and decreasing by 0.05 dB with respect to a power increase of 1 dB of the input signal, and have a phase characteristic of delay and advance of 0.3 deg. , And amplify the power-divided input signal.
An electromagnetic wave corresponding to the signal amplified by the unit amplifiers 34 and 35 may be radiated to the space, and the power may be synthesized in the space. Therefore, the gain change and the phase change are flattened with the increase of the input power, so that the distortion can be reduced and the loss due to the power combiner 36 can be eliminated.

As described above, according to the eighth embodiment, instead of the power combiner 36, an electromagnetic wave corresponding to the signal amplified by the unit amplifiers 34 and 35 is radiated to the space,
Since the directional antennas 38 and 39 that combine power in space are used, there is an effect that the loss due to the power combiner 36 can be eliminated.

[0052]

As described above, according to the present invention, one or more unit amplifiers and other unit amplifiers have gain characteristics having different signs with respect to the power change of the input signal. Amplifying means for amplifying the input signal distributed by the distributing means, and power combining means for power combining the amplified signals, so that the gain change is flattened with respect to the change in input power, The effect that the loss can be reduced and the distortion power can be reduced without providing a linearizer is obtained.

Further, according to the present invention, one or more unit amplifiers and other unit amplifiers have mutually different phase characteristics with respect to the power change of the input signal and are distributed by the power distribution means. Amplifying means for amplifying the input signal, and a power combining means for power combining the amplified signals, so that a phase change is flattened with respect to a change in the input power, without providing a linearizer. The effect of reducing the loss and the distortion power can be obtained.

Further, according to the present invention, at least one unit amplifier and the other unit amplifiers have gain characteristics and phase characteristics having different signs with respect to the power change of the input signal. Amplifying means for amplifying the input signal distributed by the above and power combining means for combining the amplified signals, so that the gain change and the phase change are flattened with respect to the change in the input power. Thus, it is possible to obtain an effect that the loss can be reduced and the distortion power can be reduced without providing a linearizer.

Further, according to the present invention, the amplifying means comprises:
Since it is composed of a gain control circuit and a plurality of unit amplifiers having a gain characteristic that increases with an increase in the power of the input signal,
An amplifier having a characteristic in which the gain increases with an increase in the power of the input signal can be obtained, and the gain characteristic can be accurately flattened in combination with a unit amplifier having a characteristic in which the gain decreases with an increase in the power of the input signal. And the effect of effectively reducing distortion power can be obtained.

Further, according to the present invention, the amplifying means comprises:
Since it is composed of a phase control circuit having a phase characteristic of a delay phase with respect to an increase in the power of the input signal and a plurality of unit amplifiers, it is possible to obtain an amplifier having a characteristic in which the phase is delayed with respect to an increase in the power of the input signal. By combining with a unit amplifier having a characteristic in which the phase advances with respect to an increase in the power of the input signal, the phase characteristic can be accurately flattened,
The effect that distortion power can be reduced effectively is obtained.

Furthermore, according to the present invention, the amplifying means
Since it is composed of a gain phase control circuit having a gain characteristic and a phase characteristic of a lag phase which increase with an increase in the power of the input signal and a plurality of unit amplifiers, the gain increases and the phase lags with the increase in the power of the input signal It is possible to obtain an amplifier having characteristics, the gain characteristic and the phase characteristic can be accurately flattened by combining with a unit amplifier having a characteristic in which the gain decreases and the phase advances with respect to an increase in the power of the input signal, The effect that distortion power can be reduced effectively is obtained.

Further, according to the present invention, the power combining means is constituted by a plurality of antennas which radiate an electromagnetic wave corresponding to the signal amplified by the amplifying means to the space and perform power combining in the space. This has the effect of eliminating loss due to

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a power amplification device according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a gain characteristic and a phase characteristic of the unit amplifier according to the first embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a gain characteristic and a phase characteristic obtained by calculating output power of an output terminal with respect to input power of an input terminal according to the first embodiment of the present invention;

FIG. 4 is a characteristic diagram showing a gain characteristic and a phase characteristic of a unit amplifier according to a second embodiment of the present invention.

FIG. 5 is a characteristic diagram showing gain characteristics and phase characteristics obtained by calculating output power of an output terminal with respect to input power of an input terminal according to a second embodiment of the present invention.

FIG. 6 is a characteristic diagram showing a gain characteristic and a phase characteristic of a unit amplifier according to a third embodiment of the present invention.

FIG. 7 is a characteristic diagram showing a gain characteristic and a phase characteristic obtained by calculating output power of an output terminal with respect to input power of an input terminal according to a third embodiment of the present invention.

FIG. 8 is a configuration diagram showing a power amplification device according to Embodiment 4 of the present invention.

FIG. 9 is a characteristic diagram showing a gain characteristic and a phase characteristic obtained by calculating output power of an output terminal with respect to input power of an input terminal according to a fourth embodiment of the present invention.

FIG. 10 is a characteristic diagram showing gain characteristics and phase characteristics obtained by calculating output power of an output terminal with respect to input power of an input terminal according to a fourth embodiment of the present invention.

FIG. 11 is a characteristic diagram showing a gain characteristic and a phase characteristic obtained by calculating output power of an output terminal with respect to input power of an input terminal according to a fourth embodiment of the present invention.

FIG. 12 is a configuration diagram showing a power amplification device according to Embodiment 5 of the present invention.

FIG. 13 is a configuration diagram illustrating a power amplifying device according to a sixth embodiment of the present invention.

FIG. 14 is a configuration diagram showing a power amplification device according to a seventh embodiment of the present invention.

FIG. 15 is a configuration diagram illustrating a power amplification device according to an eighth embodiment of the present invention.

FIG. 16 is a configuration diagram showing a power amplification device according to an eighth embodiment of the present invention.

FIG. 17 is a configuration diagram illustrating a power amplifying device according to an eighth embodiment of the present invention.

FIG. 18 is a configuration diagram showing a conventional balanced amplifier.

FIG. 19 is a configuration diagram illustrating a power amplifying device of a conventional television relay broadcaster.

FIG. 20 is a configuration diagram showing a conventional distortion compensation circuit.

[Explanation of symbols]

32 power distributor (power distribution means), 33, 40, 5
0,60 amplifying means, 34,35 unit amplifier, 36
Power combiner (power combining means), 38, 39 directional antenna (antenna), 41 gain control circuit, 51 phase control circuit, 61 gain phase control circuit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatoshi Nakayama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Kazutomi Mori 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Mitsubishi Electric Corporation (reference) MA14 SA14 TA01 TA02

Claims (7)

[Claims] 1. A power distribution means for power distribution of an input signal, and gains having different signs with respect to a change in power of the input signal in one or more unit amplifiers and a plurality of other unit amplifiers. Amplifying means having characteristics and amplifying the input signal distributed by the power distribution means,
A power amplifying device comprising: power combining means for combining power of the signal amplified by the amplifying means. 2. A power distribution means for distributing power of an input signal, and a plurality of unit amplifiers comprising at least one unit amplifier and other unit amplifiers having different phases with respect to changes in power of the input signal. Amplifying means having characteristics and amplifying the input signal distributed by the power distribution means,
A power amplifying device comprising: power combining means for combining power of the signal amplified by the amplifying means. 3. A power distribution means for distributing power of an input signal, and a plurality of unit amplifiers and one or more unit amplifiers and other unit amplifiers, wherein gains having different signs with respect to a power change of the input signal. Has characteristics and phase characteristics,
A power amplifying apparatus comprising: an amplifying unit that amplifies an input signal distributed by the power distribution unit; and a power combining unit that combines power of the signal amplified by the amplifying unit. 4. The amplifying means comprises a gain control circuit having a gain characteristic which increases with an increase in power of an input signal, and a plurality of unit amplifiers, wherein the gain control circuit, at least one unit amplifier, and other unit amplifiers are provided. 2. The power amplifying device according to claim 1, wherein the power amplifying device has gain characteristics having different signs with respect to the power change of the input signal, and amplifies the input signal distributed by the power distribution means. 5. The amplifying means includes a phase control circuit having a phase characteristic of a phase lag with respect to an increase in power of an input signal, and a plurality of unit amplifiers, and includes a phase control circuit, at least one unit amplifier, and other unit amplifiers. 3. The power amplifying device according to claim 2, wherein the amplifier and the amplifier have mutually different phase characteristics with respect to the power change of the input signal and amplify the input signal distributed by the power distribution means. 6. The amplifying means comprises a gain / phase control circuit having a gain characteristic and a phase characteristic of a lag phase which increase with an increase in power of an input signal, and a plurality of unit amplifiers. The unit amplifier and the other unit amplifiers have different gain characteristics and phase characteristics of positive and negative signs with respect to the power change of the input signal, and amplify the input signal distributed by the power distribution means. The power amplification device according to claim 3. 7. The power combiner according to claim 1, wherein the power combiner includes a plurality of antennas that radiate an electromagnetic wave corresponding to the signal amplified by the amplifier to a space and perform power combiner in the space. The power amplifying device according to any one of the preceding claims.