Patent ID: 7816982
Filing Date: 2010-10-19
Classification: H03F,H03K

Abstract:
1. A switching audio power amplifier, comprising: a first comparator, for generating a first pulse width modulation (PWM) signal according to a comparison between a first reference signal and a first input audio signal; a second comparator, for generating a second PWM signal according to a comparison between a second reference signal and the first input audio signal; a control logic unit, for generating a third PWM signal and a fourth PWM signal according to levels of the first and second PWM signals; a de-noise circuit, for increasing a pulse width of the third PWM signal when the pulse width of the third PWM signal is smaller than a threshold, increasing a pulse width of the fourth PWM signal when the pulse width of the fourth PWM signal is smaller than the threshold, and outputting a fifth PWM signal and a sixth PWM signal; and a bridge circuit, having a plurality of switches controlled by the fifth and sixth PWM signals to conduct a driving current alternately flowing to and from a load.