Patent ID: 6556814
Filing Date: 2003-04-29
Classification: H03F,H04B

Abstract:
A power amplifier load adjust system for use in a radiotelephone, the radiotelephone operable over a predetermined band of frequencies and powered by a battery, the power amplifier load adjust system comprising:a power amplifier having an input and an output; a variable impedance network coupled to the output of the power amplifier, the variable impedance network presenting a plurality of impedances to the output of the power amplifier responsive to a load control signal; a control circuit for generating a transmit power command and a channel frequency command; a memory for storing a plurality of control values as a function of power amplifier output power and frequency of operation; and a processing circuit coupled to the variable impedance network, the control circuit, and the memory, the processing circuit for retrieving the plurality of control values stored in the memory and using the plurality of control values to generate the load control signal in response to the transmit power command and the channel frequency command.