Patent ID: 8213888

Claim:
A power control circuit that controls a gain of an amplifier in such a manner that output power of the amplifier reaches a desired power value according to a power control signal by using a directional coupler to take out a part of the output power of the amplifier at an output terminal of the amplifier and using a detector to detect a power value of the output power of the amplifier on a basis of an output value of the directional coupler, said power control circuit comprising: a digital feedback loop which converts an output signal of the detector as a detected signal to a digital signal, determines a first differential between the detected signal converted to the digital signal and the power control signal, and converts the first differential to a first analog signal and outputs a first feedback signal; an analog feedback loop which outputs a high frequency element of a second differential between the power control signal converted to a second analog signal and the output signal of the detector as the detected signal as a second feedback signal; and an adder which determines the sum of the first feedback signal and the second feedback signal and outputs a gain control signal for controlling the gain of the amplifier.