Patent ID: 8344799

Claim:
A power amplifier comprising: a directional coupler that branches a part of a high-frequency input signal; a delay circuit that receives a main signal output from the directional coupler and adds a predetermined amount of delay; an input branch circuit that branches an output signal of the delay circuit into two output signals, inputs one of the output signals to a carrier amplifier, and branches the other of the output signals to a peak amplifier; the carrier amplifier that amplifies a carrier of the one output signal output from the input branch circuit; the peak amplifier that amplifies a peak component of the other output signal output from the input branch circuit; an average power level detecting circuit that detects an average power level of the high-frequency input signal; a peak power level detecting circuit that detects a peak power level of the high-frequency input signal; a first voltage controller that controls a DC voltage supplied to the carrier amplifier according to an output voltage signal from the average power level detecting circuit; and a second voltage controller that controls a DC voltage supplied to the peak amplifier according to an output voltage signal from the peak power level detecting circuit.