Patent ID: 7969240

Claim:
A bias control circuit comprising: an input port for receiving a signal indicative of an amplitude of a supply voltage, the supply voltage for being provided to a multi stage power amplifier circuit; electronic circuitry electrically coupled to the input port, the electronic circuitry for generating, in dependence upon the signal indicative of a supply voltage, a bias control signal for provision to a first stage power amplifier of the multi stage power amplifier circuit, the bias control signal being generated such that a gain change of the multi stage power amplifier circuit due to a supply voltage change is substantially compensated; an output port electrically coupled to the electronic circuitry, the output port for being electrically coupled to a bias port of the first stage power amplifier and for providing the bias control signal thereto; and a second input port electrically coupled to the electronic circuitry for receiving a current signal, wherein the electronic circuitry comprises a multiplier for generating the bias control signal in dependence upon the signal indicative of a supply voltage and the current signal.