Patent ID: 9300255
Filing Date: 2016-03-29
CPC Classification: H03F

Claim Text:
1. A radio communication circuit comprising: a power amplifier configured to amplify a signal and output the amplified signal; an envelope detector configured to extract an envelope of an input signal inputted to the power amplifier; an offset generator configured to generate an offset value for a power supply voltage to be applied to the power amplifier, based on a distortion amount in an output signal from the power amplifier; and a power supply voltage modulator configured to control the power supply voltage to be applied to the power amplifier based on the envelope extracted and the offset value generated, wherein the distortion amount in the output signal from the power amplifier is expressed as a ratio between first power of the output signal from the power amplifier and second power of a signal on a channel adjacent to a channel for the output signal from the power amplifier.