Patent ID: 7847637

Claim:
An apparatus comprising: a first voltage rail; a second voltage rail; a first switch that is coupled to the first voltage rail; a second switch that is coupled to the second voltage rail and to the first switch; a driver that receives an input signal and that is coupled to each of the first and second switches so as to actuate and deactuate the first and second switches; an inductor coupled to the node between the first and second switches; a third switch that is coupled between the inductor and the first voltage rail; a fourth switch that is coupled between the inductor and the second voltage rail; and an amplifier having a signal input terminal, a first power input terminal, a second power input terminal, and an output terminal, wherein the signal input terminal receives the input signal, and wherein the first power input terminal is coupled to the third switch, and wherein the second power input terminal is coupled to the fourth switch.