Patent ID: 7554394

Claim:
A power amplifier circuit comprising: a first amplifier circuit which amplifies a signal in first and third operations; a second amplifier circuit which amplifies a signal in second and third operations; a distribution circuit which supplies an input signal to the first amplifier circuit in the first operation, supplies the input signal to the second amplifier circuit in the second operation, and distributes and supplies the input signal to the first and second amplifier circuits in the third operation; a combining circuit which combines output signals from the first and second amplifier circuits in the third operation; a comparison circuit which compares output signals from the first and second amplifier circuits; and a control circuit which controls the first and second amplifier circuits, the distribution circuit, and the combining circuit, wherein the distribution circuit adjusts, in the third operation, power of the signal input to the first amplifier circuit to within a range in which the power of the signal input to the first amplifier circuit and power of the output signal from the first amplifier circuit are proportional to each other, the power of the signal from the first amplifier circuit that is input to the comparison circuit and the power of the signal from the second amplifier circuit that is input to the comparison circuit are equal to each other in a linear operation in which the power of the signal input to the first and second amplifier circuits and the power of the output signals from the first and second amplifier circuits are proportional to each other, and the comparison circuit adjusts gain or saturated power of the second amplifier circuit based on difference between the signals from the first and second amplifier circuits and input to the comparison circuit so that the power input to the second amplifier circuit and the power output from the second amplifier circuit are proportional to each other.