JPH09116359A - Power amplifier circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption of a power amplifier circuit with no limitation by providing plural input variable circuits which supply the distributed power to the amplifier circuit and then deciding the bias voltage to be supplied to the amplifier circuit based on the output power level to output it and also controlling the operation of every input variable circuit via a control circuit. SOLUTION: A distribution circuit 2 divides almost equally the input power into (n) pieces and inputs these divided powers to the amplifier circuits 3-1 to 3-n via the input variable circuits 8-1 to 8-n respectively. The amplified power are synthesized by a synthesizing circuit 4 and outputted. At the same time, the output power level is detected by a detection circuit 5. A control circuit 6 decides the value of the bias voltage to be applied to the circuits 3-1 to 3-n based on the output power level and outputs the decided voltage value. If the output power level is lower than the prescribed level, the number of circuits 3-1 to 3-n needed for the power amplification are calculated then the instruction signal is sent to the circuits 8-1 to 8-n to turn off other power supplies than those required for the necessary power amplifier circuits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly to a power amplifier circuit that amplifies power of a plurality of carriers.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a configuration example of a conventional power amplifier circuit.

In this conventional example, as shown in FIG. 3, an input terminal 101 to which high-frequency power output from a plurality of mobile stations (not shown) is input, and power input via the input terminal 101 are substantially uniform. A distribution circuit 102 that divides into n equal parts,
Amplifier circuits 103-1 to 103-n for amplifying the power distributed in the distribution circuit 102, and the amplifier circuit 10 respectively.
3-1 to 103-n, a combining circuit 104 that combines the amplified powers, and a detection circuit 105 that detects the level of the combined power in the combining circuit 104,
Depending on the output terminal 107 for outputting the power combined by the combining circuit 104 and the level of the output voltage detected by the detection circuit 105, the amplifier circuits 103-1 to 10-3
The control circuit 106 determines and outputs the bias voltage supplied to 3-n.

The operation of the power amplifier circuit shown in FIG. 3 will be described below.

When high frequency power output from a plurality of mobile stations is input to distribution circuit 102 via input terminal 101, distribution circuit 102 distributes the input power substantially evenly into n equal parts. Amplifier circuits 103-1 to 103
-N is input to each. Here, the distribution number n is determined by conditions such as the output level of the amplifier circuits 103-1 to 103-n.

When the power distributed to the amplifier circuits 103-1 to 103-n is input, the amplifier circuits 103-1 to 103
At -n, the input power is amplified.

Here, the amplifier circuits 103-1 to 103-n
In each of the above, the bias voltage required for power amplification is supplied from the control circuit 106.

When the power is amplified in the amplifier circuits 103-1 to 103-n, the amplified power is output to the combining circuit 1.
04, and all the powers are combined.

The power combined in the combining circuit 104 is output from the output terminal 107 as output power.

Further, the detection circuit 105 detects the level of the output power synthesized by the synthesis circuit 104, and the detection result is sent to the control circuit 106.

Then, in the control circuit 106, the value of the bias voltage applied to each of the amplifier circuits 103-1 to 103-n is determined based on the level of the output power sent from the detection circuit 105 and output.

In the power amplifier circuit configured as described above, the value of the bias voltage required for power amplification in the amplifier circuits 103-1 to 103-n is controlled according to the level of the output voltage. As a result, the use efficiency of electric power was improved.

[0013]

In the conventional power amplifier circuit described above, the bias voltage applied to the amplifier circuit is controlled to reduce the power consumption when the output power of the power amplifier circuit is small, Although the power usage efficiency is improved, the amplifier used in the amplifier circuit is often composed of A class or AB class close to A class because linearity is required. However, if the change width of the bias voltage is increased, the oscillation of the amplifier may occur.

Therefore, a certain limit is set in the variation range of the bias voltage, and when the number of carriers from the mobile station is extremely reduced such as at night, the bias voltage cannot be changed greatly, and sufficient power consumption is achieved. However, there is a problem in that it cannot be reduced.

The present invention has been made in view of the problems of the above-mentioned conventional technique, and it is an object of the present invention to provide a power amplifier circuit capable of reducing power consumption without being limited. To aim.

[0016]

To achieve the above object, the present invention provides a distribution circuit for distributing input power, a plurality of amplification circuits for amplifying the power distributed respectively in the distribution circuit, In a power amplification circuit including a synthesis circuit that synthesizes and outputs the power amplified in each amplification circuit, the power amplification circuit is provided corresponding to each of the amplification circuits, and the power of each of the amplification circuits is turned on / off. A plurality of input variable circuits that control the OFF state and control the supply of the power distributed in the distribution circuit to the amplification circuit, a detection circuit that detects the level of output power in the synthesis circuit, and the detection circuit. The bias voltage to be supplied to the amplifier circuit is determined according to the level of the output power detected in step S1, and the output voltage is controlled and the operation of each input variable circuit is controlled. Characterized by comprising a control circuit.

The control circuit is required for power amplification with respect to the output power level when the level of the output power detected by the detection circuit is smaller than a predetermined value. The number of amplifier circuits is calculated, and the power of the amplifier circuits is turned off with the calculated number left.
A signal indicating that the F state is set is sent to the input variable circuit.

The variable input circuit is a variable resistance attenuator.

(Operation) In the present invention configured as described above, in the control circuit, when the level of the output voltage detected by the detection circuit is smaller than a predetermined value, the level of the output voltage is set to the output voltage level. On the other hand, the number of amplifier circuits required for power amplification is calculated, and a signal to turn off the power source of the amplifier circuits is sent to the input variable circuit with the calculated number remaining. Then, in the input variable circuit, the power of only the amplifier circuit necessary for power amplification is turned on, and the power amplification operation is performed.

In this way, even when the number of carriers input is extremely small and the output power level is small, such as at night, the power consumption is reduced according to the number of carriers input.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

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

In this embodiment, as shown in FIG. 1, the input terminal 1 to which the high frequency power output from a plurality of mobile stations (not shown) is input, and the power input via the input terminal 1 are made substantially uniform. A distribution circuit 2 that divides into n equal parts and an amplification circuit 3-1 that amplifies the power distributed in the distribution circuit 2 respectively.
To 3-n and amplifier circuits 3-1 to 3-n, respectively, for controlling the ON / OFF state of the power supply of each of the amplifier circuits 3-1 to 3-n, and to the distribution circuit 2
In the input variable circuits 8-1 to 8-n for controlling the supply of the power distributed to the amplifier circuits 3-1 to 3-n and the power amplified in the amplifier circuits 3-1 to 3-n, respectively. The synthesizing circuit 4 for synthesizing, the detection circuit 5 for detecting the level of the power synthesized by the synthesizing circuit 4, the output terminal 7 for outputting the power synthesized by the synthesizing circuit 4, and the detection circuit 5 for detecting the level. The bias voltage to be supplied to the amplifier circuits 3-1 to 3-n is determined according to the level of output power and output, and the control circuit 6 controls the operations of the input variable circuits 8-1 to 8-n. There is.

The operation of the power amplifier circuit configured as described above will be described below.

When high frequency power output from a plurality of mobile stations is input to the distribution circuit 2 via the input terminal 1,
In the distribution circuit 2, the input power is distributed substantially evenly into n equal parts, and is input to each of the amplifier circuits 3-1 to 3-n via the input variable circuits 8-1 to 8-n. here,
The distribution number n is determined by conditions such as the output level of the amplifier circuits 3-1 to 3-n.

When the power distributed to the amplifier circuits 3-1 to 3-n is input, the input power is amplified in the amplifier circuits 3-1 to 3-n.

The bias voltage required for power amplification in each of the amplifier circuits 3-1 to 3-n is supplied from the control circuit 6.

When the power is amplified in the amplifier circuits 3-1 to 3-n, the amplified power is sent to the combining circuit 4 and all the power is combined.

The power combined by the combining circuit 4 is output from the output terminal 7 as output power.

The detection circuit 5 detects the level of the output power combined by the combining circuit 4, and the detection result is sent to the control circuit 6.

Then, in the control circuit 6, the detection circuit 5
From the level of the output power sent from the amplifier circuit 3-1
The value of the bias voltage applied to each of .about.3-n is determined and output.

In the control circuit 6, the detection circuit 5
If the output power level sent from the device is smaller than a predetermined value (extremely small, such as at night), the amplifier circuit required for power amplification with respect to the output power level The number of 3-1 to 3-n is calculated,
The input variable circuits 8-1 to 8-8 are signals indicating that the power supplies of the amplifier circuits 3-1 to 3-n are turned off with the calculated number of minutes left.
Sent for -n.

As a result, the variable input circuits 8-1 to 8-n are provided.
ON / OF of power supply of amplifier circuits 3-1 to 3-n
Amplifier circuit 3 in which F state is controlled and power is ON
The power distributed in the distribution circuit 2 is supplied only to 1 to 3-n.

Here, the amplifier circuits 3-1 to 3-3-on the ON state.
In order to prevent the distribution level in distribution circuit 2 from changing due to the change in the number of n, a sufficient isolation is provided between distribution circuit 2 and amplifier circuits 3-1 to 3-n. The control circuit 6 controls each of the variable input circuits 8-1 to 8-n.

FIG. 2 shows the input variable circuit 8-1 shown in FIG.
8 is a circuit diagram showing an embodiment of 8-n.

In this embodiment, as shown in FIG. 2, the input terminal 9 to which the electric power distributed in the distribution circuit 2 is input and the control signal input terminal 1 to which the control signal from the control circuit 6 is input.
1, an output terminal 10 for outputting electric power to be amplified to the amplifier circuits 3-1 to 3-n, and two capacitors 1
2a, 12b and three coils 13a, 13b, 13c
And four pin diodes 14a, 14b, 14c, 1
4d and two resistors 15a and 15b.

The input variable circuit according to the present invention is not limited to the one shown in FIG. 2, but may be any variable resistance attenuator or the like that can sufficiently attenuate the voltage.

[0038]

As described above, according to the present invention, in the control circuit, when the level of the output voltage detected by the detection circuit is smaller than a predetermined value, the electric power is output with respect to the level of the output voltage. Calculate the number of amplifier circuits required for amplification, send a signal to the input variable circuit to turn off the power of the amplifier circuit with the calculated number remaining, and output power to the input variable circuit. Since the power amplification operation is performed by turning on the power supply of only the amplification circuit required for amplification, even when the number of carriers input is extremely small and the output power level is small, such as at night, Without being limited, it is possible to sufficiently reduce the power consumption according to the number of carriers input.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram showing an embodiment of the input variable circuit shown in FIG.

FIG. 3 is a block diagram showing a configuration example of a conventional power amplifier circuit.

[Explanation of symbols]

 1,9 Input terminal 2 Distribution circuit 3-1 to 3-n Amplification circuit (1 to n) 4 Synthesis circuit 5 Detection circuit 6 Control circuit 7,10 Output terminal 8-1 to 8-n Input variable circuit 11 Control signal input Terminals 12a, 12b Capacitors 13a, 13b, 13c Coils 14a, 14b, 14c, 14d Pin diodes 15a, 15b Resistors

Claims (3)

[Claims] 1. A distribution circuit for distributing input power,
A power amplifier circuit comprising a plurality of amplifier circuits for respectively amplifying the power distributed in the distribution circuit, and a combining circuit for combining and outputting the power amplified in the respective amplifier circuits, wherein each of the amplifier circuits A plurality of input variable circuits that are provided corresponding to the respective control circuits and that control the ON / OFF state of each power source of the amplifier circuit and that control the supply of the power distributed by the distribution circuit to the amplifier circuit. A detection circuit that detects the level of output power in the synthesis circuit; and a bias voltage to be supplied to the amplification circuit that is determined and output based on the level of output power detected in the detection circuit. A power amplifier circuit comprising: a control circuit for controlling an operation. 2. The power amplifier circuit according to claim 1, wherein the control circuit sets the output power level to the output power level when the output power level detected by the detection circuit is smaller than a predetermined value. On the other hand, the number of the amplifier circuits required for power amplification is calculated, and a signal to turn off the power source of the amplifier circuits is sent to the input variable circuit with the calculated number remaining. Characteristic power amplification circuit. 3. The power amplifier circuit according to claim 1, wherein the input variable circuit is a variable resistance attenuator.