Patent ID: 7852155
Filing Date: 2010-12-14
Classification: H03F

Abstract:
1. A class-D amplifier comprising: a first switch and a second switch coupled as a first pair of stacked switches having a first output at a common node between the first switch and the second switch; a third switch and a fourth switch coupled as a second pair of stacked switches having a second output at a common node between the third switch and the fourth switch; and a control circuit operably coupled to short only the first output to the second output, the control circuit including a fifth switch coupled between the first output of the first pair of stacked switches and the second output of the second pair of stacked switches wherein the control circuit is configured to operate the fifth switch to short the first output to the second output, the control circuit configured to receive an input signal and responsively form a first pulse width modulated signal having a first duty cycle that is determined by an amplitude of the input signal and also responsively form a second pulse width modulated signal having a second duty cycle that is determined by an amplitude of the input signal wherein a difference between the first duty cycle and the second duty cycle is proportional to an amplitude of the input signal.