Power amplifier power controller

摘要

A power amplifier power controller in the power amplifier system monitors various operating conditions of the power amplifier, and controls the output transmit power of the power amplifier by coordinated control of both the input drive level to the power amplifier and the gain of the power amplifier. The power amplifier power controller controls the input drive level to the power amplifier so that the input drive level does not change substantially while adjusting the gain of the power amplifier to maximize the transmit power. The power amplifier power controller may also adjust the input drive level by some portion of the overall change required to the power of the power amplifier, while adjusting the gain of the power amplifier by the remaining portion of such overall change.

主权项

1. A power amplifier system, comprising:
a power amplifier to receive and amplify an RF input signal including at least amplitude modulation information to generate an RF output signal; a variable drive circuit to provide the RF input signal to the power amplifier, the variable drive circuit having an adjustable drive level for driving the RF input signal; and a power amplifier power controller to monitor an impedance mismatch at an output of the power amplifier and to adjust a gain of the power amplifier based on the monitored impedance mismatch while controlling the variable drive circuit to maintain the adjustable drive level of the variable drive circuit substantially constant.