Patent ID: 7132884
Filing Date: 2006-11-07
Classification: H03F

Abstract:
1. A power amplifier having at least push-pull means obtained by push-pull connecting a pair of switching devices, and amplifying the power of an input signal using the push-pull means, comprising: drive signal generation means for producing a pulse width modulation signal which represents the level of the input signal by a pulse width, and generating, based on the pulse width modulation signal, a drive signal to be supplied to the push-pull means, wherein the push-pull means generates an output signal based on the drive signal generated according to the selected drive signal generation system, and a power amplified signal is obtained from the output signal, wherein the drive signal generation system includes first and second systems, the first system generating a drive signal that changes at separation points of each cycle period of the pulse width modulation signal, and the second system generating a drive signal that does not change at separation points of each cycle period.