Patent ID: 6167242
Filing Date: 2000-12-26
Classification: H03F,H03G

Abstract:
An RF power controller comprising:a power control amplifier coupled to an RF power amplifier to provide the RF power amplifier with a control signal during ENABLE mode, the RF power amplifier providing a power output signal in response to the control signal;feedback circuitry that provides a feedback signal indicative of the power output signal, the feedback circuitry being coupled to the RF power amplifier and to an input of the power control amplifier, the control signal being set based on the difference between the feedback signal and a power control input signal; andauto-zero loop circuitry coupled to the power control amplifier, the feedback circuitry and the RF power amplifier, the auto-zero control circuitry operating to close a cancellation loop while measuring and storing voltage offsets during STANDBY mode, and to provide a signal that cancels the measured offset voltage during ENABLE mode.