Patent ID: 7684513

Claim:
An amplifier circuit comprising: a constant envelope signal generating section for generating a plurality of constant envelope signals from an input signal; a pilot signal generating section for generating a plurality of pilot signals associated with the generated plurality of constant envelope signals, respectively, the plurality of pilot signals having predetermined amplitudes, predetermined phases and predetermined frequencies, respectively, said phases and frequencies being different from each other; an addition section for adding the plurality of pilot signals to the generated plurality of constant envelope signals; an amplifying section for amplifying the plurality of constant envelope signals to which the plurality of pilot signals are added; and a correction section for correcting an amplitude or phase of one of the generated plurality of constant envelope signals using a signal component included in the amplified plurality of constant envelope signals and corresponding to the plurality of pilot signals, wherein: the pilot signal generating section generates the plurality of pilot signals including a first pilot signal and second pilot signal of a frequency lower than a frequency band of the input signal, and a third pilot signal and fourth pilot signal of a frequency higher than the frequency band of the input signal.