Dynamic bias for RF power amplifiers

摘要

The present invention provides a subscriber unit transmitter in a communication link with a base station, the transmitter configured to perform reverse power control of a wireless communication signal, comprising: an RF power amplifier with a bias point related to controlling amplification in a linear region of amplifier gain on the communication signal to produce an RF output signal; a detector configured to produce a dc reference signal based on the communication signal; a converter, coupled to said detector, configured to weight a received transmit power control (TPC) signal sent by the base station with the dc reference signal to generate a current signal, where the TPC is varied according to a desired increased or decreased adjustment of the transmitter's transmit power, the TPC being derived by quantitative measurements made by the base station; and comparing means for comparing said current signal with a feedback from said RF output signal to produce a bias signal; whereby said bias point of the RF amplifier is dynamically adjusted responsive to said bias signal.