Patent ID: 6972621

Claim:
A power amplifier for amplifying an original signal including a plurality of signals of different frequencies, the power amplifier comprising: a signal input section for inputting the original signal; a signal output section for outputting a signal to outside the power amplifier, wherein a route from the signal input section to the signal output section is a signal amplifying route; an amplifying section for amplifying signal on the signal amplifying route; an envelope signal generating section for generating an envelope signal having components identical to envelope components included in the original signal; a distortion signal generating section for generating, based on the original signal, a distortion signal for canceling distortion components occurring while the signal is amplified by the amplifying section; a distortion signal injecting section for injecting the distortion signal to the signal amplifying route so as to suppress the distortion components; and an envelope signal injecting section for injecting the envelope signal to a distortion signal generating route from the signal input section to the distortion signal injecting section so that an asymmetric characteristic of frequency components included in the distortion signal which correspond to the distortion components coincides with an asymmetric characteristic of the distortion components.