Patent ID: 8451054
Filing Date: 2013-05-28
Classification: H03F,H04B

Abstract:
1. A power amplifying device that amplifies a modulation signal containing an amplitude modulation component and a phase modulation component, comprising: a radio frequency amplifier that amplifies said modulation signal and outputs the resultant signal; a linear amplifying section that adds an output voltage to a power supply voltage supplied to said radio frequency amplifier, amplifies a difference between the output voltage and the amplitude modulation component of said modulation signal, and outputs the resultant difference; a control signal generation section that detects a direction in which an output current of said linear amplifying section flows and generates a pulse modulation signal according to the direction of the current; a switching amplifying section that controls connection and disconnection of a DC current based on said pulse modulation signal as a control signal so as to perform switching amplification for an output signal of said linear amplifying section, to add the resultant signal to a predetermined DC voltage, and to supply the resultant signal as said power supply voltage to said radio frequency amplifier; a first DC power supply that supplies said DC current to said switching amplifying section; and a second DC power supply that supplies said predetermined DC voltage to said switching amplifying section.