Patent ID: 7855599

Claim:
A power amplifier for amplifying a modulated wave signal containing amplitude and phase modulation components, comprising: a signal generating circuit extracting an amplitude modulation component from the modulated wave signal, outputting the amplitude modulation component by dividing the amplitude modulation component into a plurality of control signals, and extracting and outputting a phase modulation component from the modulated wave signal; a plurality of control signal amplifiers amplifying the control signals; and a radio frequency amplifier outputting the phase modulation component by amplifying the phase modulation component and performing amplitude modulation on the modulated wave signal using output signals from the control signal amplifiers, wherein an output signal from the first control signal amplifier is fed as a supply voltage to the radio frequency amplifier, and an output signal from the n th control signal amplifier is fed as a supply voltage to the switching amplifier of the n−1 th control signal amplifier, where n is an integer greater than 2.