JPH0832359A - Power control circuit - Google Patents

Abstract

PURPOSE:To fix output and distortion and to reduce power consumption by outputting the high frequency signals of input through a variable amplifier to a main amplifier, synthesizing a part of the output of the main amplifier and the variable amplifier, taking out a distortion component and performing conversion to control signals. CONSTITUTION:Partial power taken out in a directional coupler 3 is distributed in a power distributor 9. One of signals branched into halves converted by a phase converter 10 and a variable attenuator 11 so as to be the same amplitude and opposite phase of the other one of the signals branched into halves in the power distributor 7. The two signals of the same amplitude and opposite phase are inputted to a synthesizer 12 and only the distortion component is taken out. The output of the synthesizer 12 is converted to a DC component in a detection circuit 13 and amplified by a voltage amplifier 14. The output of the voltage amplifier 14 is inputted to a power controller 15, a control voltage for keeping the distortion component fixed is generated and inputted to a variable power amplifier 8 and power is controlled so as to fix the distortion of output power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power control circuit in a radio transmission circuit of a base station for mobile communication, for example.

[0002]

2. Description of the Related Art FIG. 8 shows the configuration of a conventional power control circuit.
Will be described with reference to. FIG. 8 is a block diagram showing a schematic configuration of a conventional power control circuit.

In FIG. 8, 1 is a sub power amplifier to which a high frequency signal which is an output of a modulator is input, 2 is a main power amplifier which is connected to the sub power amplifier 1 and is composed of an FET or the like,
3 is a directional coupler whose output side is connected to the antenna through a filter, 4 is a detection circuit connected to the directional coupler 3, 5 is a voltage amplifier connected to the detection circuit 4, and 6 is a main power amplifier 2 Is a power control device (APC) that controls

Next, the operation of the conventional power control circuit will be described. The sub power amplifier 1 amplifies the high frequency signal up to the rated input power value of the main power amplifier 2 and outputs it to the main power amplifier 2. The output of the main power amplifier 2 is input to the directional coupler 3, a part of the power is taken out, and the other power is output.

The partial electric power extracted by the directional coupler 3 is converted into a DC component by the detection circuit 4, amplified by the voltage amplifier 5, and input to the power control device 6.
The power control device (APC) 6 converts the generated voltage value according to the output voltage of the voltage amplifier 5 and inputs the generated control voltage to the main power amplifier 2. Power control unit (APC)
The output voltage of 6 continues to fluctuate until the output of the main power amplifier 2 reaches the specified output power desired to be obtained, and control is performed.

By repeating the above operation, the change of the output power due to the temperature change and the environment change of the sub power amplifier 1, the main power amplifier 2, etc. is corrected and the output power is always kept constant.

[0007]

In the conventional power control circuit as described above, it is possible to keep the output power constant, but there is a problem that distortion compensation cannot be performed and the distortion characteristic is deteriorated. It was

In addition, when the main power amplifier 2 which consumes a large amount of current in the radio transmission circuit is composed of, for example, an FET, the input power decreases and the gain increases due to external control. There was a problem in that

The present invention has been made to solve the above problems, and an object thereof is to obtain a power control circuit capable of keeping the level and distortion of output power constant. Another object of the present invention is to obtain a power control circuit capable of reducing the current consumption of the main power amplifier.

[0010]

A power control circuit according to claim 1 of the present invention is a main power amplifier for amplifying input power, and a part of the output of the main power amplifier is fed back to the main power amplifier. In a power control circuit including a power control device that controls the main power amplification device so that its output power becomes constant, and a variable power amplifier that variably amplifies an input high frequency signal and outputs the high frequency signal to the main power amplifier. A combination device for extracting a distortion component by combining a part of the high frequency signal and a part of the output of the main power amplifier, and converting the distortion component into a control signal so that the distortion component becomes constant based on the control signal. A distortion component control device for controlling the variable power amplifier is further provided.

According to a second aspect of the present invention, in the power control circuit, the synthesizer converts a part of the output of the main power amplifier into an opposite phase, and the output of the phase converter is variable attenuated. And a combiner for combining the output of the variable attenuator and a part of the high frequency signal.

According to a third aspect of the present invention, in the power control circuit, the synthesizing device converts a part of the high frequency signal into an opposite phase, and a variable amplifier for variably amplifying an output of the phase converter. And a combiner for combining the output of the variable amplifier and a part of the output of the main power amplifier.

According to a fourth aspect of the present invention, in the power control circuit, the synthesizing device delays the phase of a part of the output of the main power amplifier by 90 degrees, and the first phase converter. A variable attenuator for variably attenuating the output of, and a second phase converter for advancing a part of the high frequency signal by 90 degrees.
It is provided with a combiner for combining the output of the variable attenuator and the output of the second phase converter.

According to a fifth aspect of the present invention, in the power control circuit, the synthesizer advances a second phase converter for advancing a part of the output of the main power amplifier by 90 degrees, and the second phase converter. A variable attenuator for variably attenuating the output of the first phase converter, a first phase converter for delaying a part of the high frequency signal by 90 degrees,
And a combiner for combining the output of the variable attenuator and the output of the first phase converter.

According to a sixth aspect of the present invention, in the power control circuit, the synthesizing device converts a part of the output of the main power amplifier into an opposite phase, and the output of the phase converter is variably attenuated. A variable attenuator, a fixed amplifier that amplifies a part of the high-frequency signal, and a combiner that combines the output of the variable attenuator and the output of the fixed amplifier.

According to a seventh aspect of the present invention, in the power control circuit, the synthesizing device converts a part of the output of the main power amplifier into an opposite phase, and attenuates the output of the phase converter. A fixed attenuator, a variable amplifier that variably amplifies a part of the high frequency signal, and a combiner that combines the output of the fixed attenuator and the output of the variable amplifier.

[0017]

In the power control circuit according to the first aspect of the present invention, the input high frequency signal is variably amplified by the variable power amplifier and output to the main power amplifier. Further, a distortion component is extracted by combining a part of the high frequency signal and a part of the output of the main power amplifier by the combining device. Further, the distortion component control device controls the variable power amplifier so that the distortion component is converted into a control signal and the distortion component becomes constant based on the control signal. Therefore, the distortion of the output power can be kept constant. Further, it is possible to reduce the current consumption while keeping the output power level constant.

In the power control circuit according to the second aspect of the present invention, the synthesizer changes the output of the phase converter and the phase converter that converts a part of the output of the main power amplifier into an opposite phase. Since the variable attenuator that attenuates and the combiner that combines the output of the variable attenuator and a part of the high frequency signal are provided, the distortion of the output power can be kept constant, and
It is possible to reduce current consumption while keeping the level of output power constant.

According to a third aspect of the present invention, in the power control circuit, the synthesizing device converts a part of the high frequency signal into an opposite phase, and a variable amplifier for variably amplifying the output of the phase converter. And a combiner for combining the output of the variable amplifier and a part of the output of the main power amplifier, the distortion of the output power can be kept constant and the level of the output power can be kept constant. At the same time, the current consumption can be reduced.

According to a fourth aspect of the present invention, in the power control circuit, the synthesizing device delays a part of the output of the main power amplifier by 90 degrees in phase, and the first phase converter. A variable attenuator for variably attenuating the output of, and a second phase converter for advancing a part of the high frequency signal by 90 degrees.
Since the output of the variable attenuator and the output of the second phase converter are combined, the distortion of the output power can be kept constant, and the level of the output power can be kept constant. , The current consumption can be reduced.

According to a fifth aspect of the present invention, in the power control circuit, the synthesizing device advances a second phase converter for advancing a part of the output of the main power amplifier by 90 degrees, and the second phase converter. A variable attenuator for variably attenuating the output of the first phase converter, a first phase converter for delaying a part of the high frequency signal by 90 degrees,
Since the output of the variable attenuator and the output of the first phase converter are combined, the distortion of the output power can be kept constant, and the level of the output power can be kept constant. , The current consumption can be reduced.

According to a sixth aspect of the present invention, in the power control circuit, the synthesizing device converts a part of the output of the main power amplifier into an opposite phase, and the output of the phase converter is variably attenuated. Since it has a variable attenuator, a fixed amplifier that amplifies a part of the high frequency signal, and a combiner that combines the output of the variable attenuator and the output of the fixed amplifier, the distortion of the output power is kept constant. It is also possible to reduce the current consumption while keeping the output power level constant.

In the power control circuit according to claim 7 of the present invention, the synthesizer converts a part of the output of the main power amplifier to an opposite phase, and attenuates the output of the phase converter. Since the fixed attenuator, the variable amplifier that variably amplifies a part of the high frequency signal, and the combiner that combines the output of the fixed attenuator and the output of the variable amplifier are provided, the distortion of the output power is kept constant. It is also possible to reduce the current consumption while keeping the output power level constant.

[0024]

【Example】

Example 1. The configuration of an embodiment of the present invention will be described with reference to FIG. First Embodiment FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention, in which a main power amplifier 2 to a power control device (A
The PC) 6 is similar to that of the conventional circuit described above. In each figure, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, 7 is a power distributor to which a high frequency signal which is an output of the modulator is input, 8 is a variable power amplifier, 9 is a power distributor connected to the directional coupler 3, and 10 is a power distributor.
Is a phase converter that converts the phase by 180 degrees, 11 is a variable attenuator connected to the phase converter 10, 12 is a combiner that combines the output of the power distributor 7 and the output of the variable attenuator 11, and 13 is a detection circuit. , 14 are voltage amplifiers connected to the detection circuit 13, and 15 is a power control device (APC) for controlling the variable power amplifier 8.

Next, the operation of the first embodiment will be described. The input high frequency signal is distributed by the power distributor 7, and one of the two branched signals is amplified by the variable power amplifier 8. The signal amplified by the variable power amplifier 8 is input to the main power amplifier 2 and further amplified.

The signal amplified by the main power amplifier 2 is input to the directional coupler 3, a part of the power is taken out, and the other signals are output. Part of the electric power taken out by the directional coupler 3 is distributed by the power distributor 9. The phase converter 10 and the variable attenuator 1 so that one of the two branched signals has the same amplitude and opposite phase as the other of the two branched signals of the power distributor 7.
Converted by 1.

The two signals having the same amplitude and opposite phase are combined by the combiner 12
Is input to, and only the distortion component is extracted. The output of the combiner 12 is converted into a DC component by the detection circuit 13 and amplified by the voltage amplifier 14. The output of the voltage amplifier 14 is input to the power control device 15, and the power control device (APC) 15 generates a control voltage for keeping the distortion component constant and inputs it to the variable power amplifier 8 to distort the output power. Power is controlled so that is constant.

The other of the two signals branched by the power distributor 9 is converted into a DC component by the detection circuit 4, and the voltage amplifier 5
Is amplified by. The output of the voltage amplifier 5 is input to the power control circuit 15, and this power control circuit (APC) 6 generates a control voltage for keeping the level of output power constant, and is input to the main power amplifier 2 to output power level. The power is controlled so that is constant. By repeating the above operation, distortion compensation and output power level control are performed.

For example, when the main power amplifier 2 is composed of an FET and the output is controlled by a gate voltage using a minus power supply, if the gain is reduced, the consumption current decreases but the absolute value of the gate voltage increases accordingly. As a result, the distortion characteristic of the output power becomes worse. Therefore, by increasing the output power of the variable power amplifier 8 to a level where the distortion of the output power of the main power amplifier 2 becomes constant, that is, the limit value, the gain of the main power amplifier 2 is decreased and the power control device (A
Since the output power of the main power amplifier 2 is controlled by the PC 6 as well, the power consumption of the main power amplifier 2 which consumes a large amount of current in the radio transmission circuit is maintained while keeping the level and distortion of the output power of the main power amplifier 2 constant. The current can be reduced.

According to the first embodiment, the distortion compensating circuit is constructed, and the output of the variable power amplifier 8 in the preceding stage of the main power amplifier 2 is controlled by the obtained control voltage, so that the distortion of the output power becomes constant. There is an effect that it can be maintained. Further, since the variable power amplifier 8 in the preceding stage has a gain as much as possible, the gain of the main power amplifier 2 is reduced, and the current consumption can be reduced while keeping the output power level constant.

Example 2. In the first embodiment, the phase converter 10 and the variable attenuator 11 are provided between the power distributor 9 and the combiner 12 so that the two signals input to the combiner 12 have the same amplitude and opposite phase. In the second embodiment, one of the two branched signals is converted by the power distributor 9, but in the second embodiment, as shown in FIG. 2, the phase converter 10 and the variable converter 10 are provided between the power distributor 7 and the combiner 12. By providing the amplifier 16, one of the two signals branched by the power distributor 7 is converted to have the same amplitude and opposite phase as one of the two signals branched by the power distributor 9. The same effect as that of the first embodiment can be obtained by synthesizing the two signals having opposite phases by the synthesizer 12.

Example 3. In the first embodiment, the phase converter 10 is provided between the power distributor 9 and the variable attenuator 11 to perform the phase conversion. However, in the third embodiment, the directional coupling is performed as shown in FIG. The phase converter 10 is provided between the power distributor 3 and the power distributor 9 to perform the phase conversion, and then the power distributor 9 performs the distribution, and the same effect as that of the first embodiment can be obtained.

Embodiment 4 FIG. Furthermore, in the first embodiment, the phase converter 1 provided between the power distributor 9 and the variable attenuator 11 is provided.
Although 180 ° phase conversion is performed only by 0, in the fourth embodiment, as shown in FIG. 4, a 90 ° phase converter 10B and a power distributor 9 are provided between the power distributor 7 and the combiner 12. The -90 ° phase converter 10A is provided between the variable attenuator 11 and the same effect as that of the first embodiment.

Example 5. In the fourth embodiment, the 90 ° phase converter 10B is provided between the power distributor 7 and the combiner 12.
Although the −90 ° phase converter 10A is provided between the power distributor 9 and the variable attenuator 11, in the fifth embodiment, as shown in FIG. 5, between the power distributor 7 and the combiner 12. -90 °
The 90 ° phase converter 10B is provided between the phase converter 10A, the power distributor 9 and the variable attenuator 11 to obtain the same effect as that of the fourth embodiment.

Example 6. Further, in the first embodiment, one of the two signals branched by the power distributor 9 is attenuated by the variable attenuator 11 so that the two signals combined by the combiner 12 have the same amplitude. In Example 6, as shown in FIG. 6, a fixed amplifier 17 is provided between the power distributor 7 and the combiner 12, a fixed value is amplified by the fixed amplifier 17, and the amplitude is adjusted by the variable attenuator 11. Also, the same effect as that of the first embodiment can be obtained.

Example 7. In the sixth embodiment, the fixed amplifier 17 is provided between the power distributor 7 and the combiner 12 to amplify a fixed value, and the variable attenuator 11 provided between the phase converter 10 and the combiner 12 is used. I am adjusting the amplification,
In the seventh embodiment, as shown in FIG. 7, the phase converter 10
A fixed attenuator 18 is provided between the power combiner 12 and the combiner 12 to perform a constant value of attenuation, and a variable amplifier 19 is provided between the power distributor 7 and the combiner 12 to adjust the amplitude. The effect of is obtained.

[0038]

As described above, the power control circuit according to the first aspect of the present invention is such that the main power amplifier for amplifying the input power and a part of the output of the main power amplifier are fed back to the main power amplifier. A power control circuit including a power control device that controls the main power amplification device so that the output power of the device is constant, and a variable power amplifier that variably amplifies an input high frequency signal and outputs the high frequency signal to the main power amplifier. A synthesizer for extracting a distortion component by synthesizing a part of the high frequency signal and a part of the output of the main power amplifier; and converting the distortion component into a control signal and keeping the distortion component constant based on the control signal. Since the distortion component control device for controlling the variable power amplifier is further provided, the distortion of the output power can be kept constant, and the consumption current can be reduced while keeping the level of the output power constant. Do An effect that theft can be.

In the power control circuit according to claim 2 of the present invention, as described above, the synthesizer includes a phase converter for converting a part of the output of the main power amplifier into an opposite phase,
Since the variable attenuator for variably attenuating the output of the phase converter and the combiner for synthesizing the output of the variable attenuator and a part of the high frequency signal are provided, the distortion of the output power can be kept constant. Moreover, it is possible to reduce the current consumption while keeping the output power level constant.

In the power control circuit according to the third aspect of the present invention, as described above, the synthesizer converts the phase converter for converting a part of the high frequency signal into an opposite phase, and the output of the phase converter. Since the variable amplifier for variably amplifying and the combiner for combining the output of the variable amplifier and a part of the output of the main power amplifier are provided, the distortion of the output power can be kept constant, and the output power can be kept constant. It is possible to reduce the current consumption while keeping the level constant.

In the power control circuit according to claim 4 of the present invention, as described above, the synthesizer includes a first phase converter that delays a part of the output of the main power amplifier by 90 degrees, and the first phase converter. A variable attenuator that variably attenuates the output of the first phase converter, a second phase converter that advances the phase of a portion of the high-frequency signal by 90 degrees, an output of the variable attenuator, and the second
Since it has a combiner that combines the output of the phase converter of
It is possible to keep the distortion of the output power constant and to reduce the current consumption while keeping the level of the output power constant.

In the power control circuit according to claim 5 of the present invention, as described above, the synthesizer includes a second phase converter that advances a part of the output of the main power amplifier by 90 degrees, and A variable attenuator that variably attenuates the output of the second phase converter, a first phase converter that delays a part of the high frequency signal by 90 degrees, an output of the variable attenuator and the first phase converter.
Since it has a combiner that combines the output of the phase converter of
It is possible to keep the distortion of the output power constant and to reduce the current consumption while keeping the level of the output power constant.

As described above, in the power control circuit according to the sixth aspect of the present invention, the synthesizer includes a phase converter for converting a part of the output of the main power amplifier into an opposite phase,
Since a variable attenuator that variably attenuates the output of the phase converter, a fixed amplifier that amplifies a part of the high frequency signal, and a combiner that combines the output of the variable attenuator and the output of the fixed amplifier are provided. It is possible to keep the distortion of the output power constant and to reduce the current consumption while keeping the level of the output power constant.

As described above, in the power control circuit according to claim 7 of the present invention, the synthesizer includes a phase converter for converting a part of the output of the main power amplifier into an opposite phase,
Since the fixed attenuator that attenuates the output of the phase converter, the variable amplifier that variably amplifies a part of the high frequency signal, and the combiner that combines the output of the fixed attenuator and the output of the variable amplifier are provided. It is possible to keep the distortion of the output power constant and to reduce the current consumption while keeping the level of the output power constant.

[Brief description of drawings]

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

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

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

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

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

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

FIG. 7 is a block diagram showing a configuration of a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a conventional power control circuit.

[Explanation of symbols]

2 main power amplifier, 3 directional coupler, 4 detection circuit,
5 voltage amplifier, 6 power controller (APC), 7 power distributor, 8 variable power amplifier, 9 power distributor, 10
Phase converter, 11 variable attenuator, 12 combiner, 13
Detection circuit, 14 voltage amplifier, 15 power control device (A
PC), 16 variable amplifier, 10A-90 ° phase converter, 10B 90 ° phase converter, 17 fixed amplifier, 1
8 fixed attenuator, 19 variable amplifier.

Claims (7)

[Claims] 1. A main power amplifier for amplifying input power, and power for controlling the main power amplifier so that the output power of the main power amplifier is constant by feeding back a part of the output of the main power amplifier. In a power control circuit equipped with a control device,
A variable power amplifier that variably amplifies an input high-frequency signal and outputs the high-frequency signal to the main power amplifier, a combining device that combines a part of the high-frequency signal and a part of an output of the main power amplifier to extract a distortion component, and A power control circuit further comprising a distortion component control device for converting the distortion component into a control signal and controlling the variable power amplifier based on the control signal so that the distortion component becomes constant. 2. The synthesizing device comprises: a phase converter for converting a part of the output of the main power amplifier into an opposite phase; a variable attenuator for variably attenuating the output of the phase converter; and a variable attenuator of the variable attenuator. The power control circuit according to claim 1, further comprising a combiner that combines a part of the high frequency signal with the output. 3. The synthesizer comprises a phase converter for converting a part of the high frequency signal into an opposite phase, a variable amplifier for variably amplifying an output of the phase converter, an output of the variable amplifier and the main power. The power control circuit according to claim 1, further comprising a combiner that combines a part of outputs of the amplifier. 4. The synthesizing device comprises a first phase converter that delays a part of the output of the main power amplifier by 90 degrees, and a variable attenuator that variably attenuates the output of the first phase converter. A second phase converter for advancing a part of the high frequency signal by 90 degrees, and a combiner for combining the output of the variable attenuator and the output of the second phase converter. The power control circuit according to item 1. 5. A second phase converter for advancing a part of the output of the main power amplifier by 90 degrees, and a variable attenuator for variably attenuating the output of the second phase converter.
A first phase converter that delays a part of the high-frequency signal by 90 degrees in phase, and a combiner that combines the output of the variable attenuator and the output of the first phase converter. The power control circuit according to item 1. 6. The synthesizer includes a phase converter that converts a part of the output of the main power amplifier into an opposite phase, a variable attenuator that variably attenuates the output of the phase converter, and one of the high-frequency signals. The power control circuit according to claim 1, further comprising a fixed amplifier that amplifies the unit, and a combiner that combines the output of the variable attenuator and the output of the fixed amplifier. 7. The synthesizer comprises a phase converter for converting a part of the output of the main power amplifier into an opposite phase, a fixed attenuator for attenuating the output of the phase converter, and a part of the high frequency signal. 2. The power control circuit according to claim 1, further comprising: a variable amplifier that variably amplifies the output, and a combiner that combines the output of the fixed attenuator and the output of the variable amplifier.