Patent ID: 7372333
Filing Date: 2008-05-13
Classification: H03F

Abstract:
1. A RF power amplifier configured to receive an RF input signal, comprising: a switched-mode power amplifier supplied by a synchronous buck DC-DC power supply; a controller configured to control the power supplied by the synchronous buck DC-DC power supply; wherein the controller is connected to a feedback loop that is configured to provide the controller with a signal capable of being used by the controller to adjust the level of the voltage supplied by the synchronous buck DC-DC power supply in response to variations in the envelope of the RF input signal; and wherein the RF input signal is provided to the input of the switched-mode power amplifier via a limiter, which limits the variation in the level of the RF input signal; and the limiter provides the limited RF input signal to a resonant gate drive that is connected to the input of the switched-mode power amplifier.