Patent ID: 8542055

Claim:
A circuit comprising: a field effect transistor having a conducting state and a non-conducting state, the field effect transistor having a gate, a source, and a drain; a first comparator configured to provide a first output based on a difference between a source voltage at the source of the field effect transistor and a first reference voltage, wherein the first output includes a first signal when the source voltage is higher than the first reference voltage and a second signal when the source voltage is lower than the first reference voltage; a switching amplifier configured to apply a first gate voltage to the gate of the field effect transistor in response to the first comparator providing the first signal and a second gate voltage to the gate of the field effect transistor in response to the first comparator providing the second signal, wherein both the first and second gate voltages are configured to place the field effect transistor in a conducting state; wherein the switching amplifier comprises: a first charge pump stage configured to provide the second gate voltage; a second charge pump stage configured to provide the first gate voltage; a switch configured to couple the second gate voltage to the second charge pump stage when the first comparator outputs the first signal; and wherein the second charge pump is configured to convert the second gate voltage into the first gate voltage when the first comparator outputs the first signal; and wherein the first gate voltage is higher than the second gate voltage.