Patent ID: 7738845

Claim:
Electronic parts for amplifying high frequency power comprising: a high frequency power amplifier which includes amplifying elements and amplifies a transmit signal having a high frequency; and an output power detection circuit which detects the magnitude of output power of the high frequency power amplifier, said electronic parts for amplifying high frequency power controlling gain of the high frequency power amplifier on the basis of an output of the output power detection circuit and a control signal indicating an output level thereof, wherein the output power detection circuit includes: a first detection circuit which detects an ac component extracted from the output of the high frequency power amplifier by a directional power coupler; a multi-stage configured amplifier circuit which amplifies the ac component extracted from the output of the high frequency power amplifier by the directional power coupler; and a second detection circuit constituted of a plurality of detection stages which detect outputs of respective amplifying stages of the amplifier circuit, and wherein the output of the first detection circuit and the output of the second detection circuit are combined together and the combined output is outputted, and an attenuator is provided on the input side of the first detection circuit.