Patent ID: 7315209
Filing Date: 2008-01-01
Classification: H03F

Abstract:
1. A power amplifier apparatus comprising: dither superimposing means for superimposing DC dither on a digital signal; switching signal generating means for converting the digital signal on which the DC dither is superimposed by the dither superimposing means to a pair of drive pulses on high and low sides having opposite levels; and cancel signal generating means for generating a cancel signal to cancel a DC component caused by the DC dither by changing a ratio of pulse widths of the drive pulses on the high and low sides generated by the switching signal generating means, wherein the cancel signal generating means includes delay means for delaying at least one of the pair of drive pulses on the high and low sides by a predetermined amount, and changes the ratio of the pulse widths of the pair of drive pulses by performing a logical operation of a delayed drive pulse generated by the delay means and the drive pulse which is not delayed.