Power amplification device, and transmission device and communication device both using thereof

Abstract

To provide a power amplification device having a function of preventing deviation of the amplitude and phase of an output signal having amplified envelope variation from a predetermined value, and a transmission device and a communication device both using the same. A power amplification device comprises a variable phase shifter circuit () for shifting a phase of an input signal; first and second adder circuits (), () for generating first and second constant envelope signals, respectively; first and second amplifier circuits (), (); first and second amplitude detection circuits (), () for detecting amplitudes; a first amplitude control circuit () for changing the amplitudes of the first and second constant envelope vector generating signals; an output adder circuit () for vector-adding the first and second amplified signals to generate an output signal; a shift amount control circuit () for controlling a shift amount of the variable phase shifter circuit; a gain control circuit () for controlling the gains of the first and second adder circuits; and a second amplitude control circuit () for changing the amplitudes of the first and second constant envelope vector generating signals.