Patent ID: 8154342

Claim:
A power amplifier controlled by a control circuit generating a first control signal, a second control signal, a third control signal, a fourth control signal and a fifth control signal, comprising: a first switch coupled between a first supply voltage and a first node and controlled by the first control signal, wherein the first switch is turned on during a first period and a second period; a second switch coupled between the first node and a second supply voltage and controlled by the second control signal, wherein the second switch is turned off during the first and the second periods; a third switch coupled between the first supply voltage and a second node and controlled by the third control signal, wherein the third switch is turned off during the first and the second periods; a fourth switch coupled between the second node and the second supply voltage and controlled by the fourth control signal, wherein the fourth switch is turned on during the first period and is turned off during the second period; and a fifth switch coupled between the first and the second nodes and controlled by the fifth control signal, wherein the fifth switch generates a short path between the first and the second nodes during the second period.