Patent ID: 7701293

Claim:
An apparatus comprising: a first supply rail; a second supply rail; an amplifier having a first power supply terminal and a second power supply terminal; a resistor-capacitor (RC) network coupled between first and second power supply terminals; a first switch coupled to the first supply rail; a second switch coupled between first switch and the first power supply terminal; a third switch coupled to the second supply rail; a fourth switch coupled between second switch and the second power supply terminal; an inductor coupled to a first node between the first and second switches and a second node between the third and fourth switches; a fifth switch that is coupled between the inductor and the second supply rail; and a controller that is coupled to the RC network so as to receive feedback from the RC network and that is coupled to each of the first, second, third, fourth, and fifth switches so as to actuate and deactauate each of the first, second, third, fourth, and fifth switches in each of a first phase, a second phase, a third phase, and a fourth phase.