Patent ID: 7035604

Claim:
Circuitry for producing a communications output signal having complex modulation, comprising: an amplification chain having at least a final stage including a power source input and a signal input; control paths whereby the power source input is controlled and the signal input is controlled; and a control circuit for through the control paths, controlling the communications output signal over a wide range of average output power levels, including: during a first period of time, controlling the power source input level and the signal input level to be comparatively high, the final stage being operated in switch mode, thereby causing the communications output signal to have a comparatively high average power level; and during a second period of time, modulating the power source input level and controlling the power source input level and the signal input level to be comparatively low, the final stage being operated in triode mode, thereby causing the communications output signal to have a comparatively low average power level.