Power amplifying devices

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 the phase modulation component of 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 and negatively feeds back the power supply voltage supplied to said radio frequency amplifier such that the power supply voltage matches the amplitude modulation component of said modulation signal with a predetermined ratio;
• 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 and to supply the resultant signal as said power supply voltage to said radio frequency amplifier;
• and
• a DC power supply that supplies said DC current to said switching amplifying section.