Load adjusting system for power amplifier for battery-powered radiotelephone has processing circuit which retrieves stored control values to generate load control signal

摘要

The system includes a variable-impedance network (36), connected to the output of a power amplifier (32). The network provides a number of impedances in response to a load control signal at the output of the power amplifier. A control circuit generates a transmission power commend and a channel frequency command. A memory (40) stores a number of control values as a function of the output power and the operating frequency of the power amplifier (32). A processing circuit (38) is connected to the variable-impedance network, the control circuit and the memory. The processing circuit retrieves the control values stored in the memory, and uses them to generate the load control signal in response to the transmission power command. An Independent claim is included for a method of controlling a variable-impedance network at the output of a power amplifier.