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Audio Signal Processing

Transmission-power-control-circuit

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Transmission power control circuit

Details

Inventors: Miyama, Keisei; Ono, Hideyo;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Pham; Chi H.
Assistant Examiner:
Attorney, Agent or Firm:

In a transmission power control circuit which performs power amplification of a transmission signal to one of several predetermined levels in response to a control signal and outputs the amplified signal, bias voltage of the power amplifier circuit is set to the optimum in response to the output power of multiple levels, respectively. Since the bias voltage is set to the optimum, the power loss in the power amplifier circuit is decreased and the efficiency of the power amplifier circuit is improved.

DETAILED DESCRIPTION An object of the invention is in that the gate bias voltage of the RF power module is varied in response to the transmission power and thereby the ratio of the idle current is optimized and the efficiency of the RF power module is improved.
In a transmission power control circuit according to the invention, a gate bias voltage control circuit is installed which outputs gate bias voltage to an RF power module in response to the output of a multiplexer to perform level setting of stepwise control.
The gate bias voltage control circuit in the invention controls the operating point of the RF power module in response to the output of the multiplexer.
Thereby the idle current of the RF power module is optimized and the efficiency of the RF power module is improved.

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