Patent ID: 8198950
Filing Date: 2012-06-12
Classification: H03F

Abstract:
1. A power amplifier that amplifies an RF modulation signal containing an amplitude modulation component and a phase modulation component, comprising: a polar modulator that outputs an amplitude component signal that is the amplitude modulation component of said RF modulation signal; a first direct current power supply that outputs a direct current voltage; a pulse modulator that pulse-modulates said amplitude component signal; a pulse amplification circuit that amplifies a pulse modulation signal that is outputted from said pulse modulator; a combining circuit that adds a direct current voltage that is outputted from said first direct current power supply to an output signal of said pulse amplification circuit; a low pass filter that smoothens an output signal of said combining circuit; and an RF amplifier that not only amplifies said RF modulation signal, but also amplitude-modulates the amplified signal with an output signal of said low pass filter and outputs the resultant signal.