Linear power amplifier with automatic gate/base bias control for optimum efficiency

摘要

A dynamic power amplifier advantageously employed in a wireless terminal for transferring and receiving signals from a base terminal includes an input amplifier (38) adapted to receive an input signal having a given power signal level corresponding to the distance of said wireless terminal to the terminal and adapted to provide an amplifier output signal having a given power output signal level. The dynamic amplifier further includes a power sensor (40) configured to receive the power output signal and to generate a power indication signal (at 50) corresponding to the power output signal, and a converter (46) adapted to receive the power indication signal in order to generate a biasing signal corresponding to the power indication signal. The biasing signal is applied to the input amplifier (52) so that the operating bias point of the power amplifier (38) varies as a function of the power indication signal.