Patent ID: 7250818

Claim:
A radio frequency power amplifier (RFPA) circuit comprising: a radio frequency power amplifier; a supply voltage source; a first feedback loop for adjusting a voltage applied to the radio frequency power amplifier, wherein the first feedback control comprises a sampler for sampling an output of the radio frequency power amplifier, a radio frequency detector for detecting a level of radio frequency power sampled by the sampler, a comparator for comparing an output signal from the radio frequency detector with a reference signal, an integrator for integrating an output signal of the comparator, and a voltage regulator having a first input from the integrator and a second input from the supply voltage source and an output connected to the radio frequency power amplifier, the regulator being operable to apply to the radio frequency power amplifier a supply voltage adjusted in response to an input control signal from the integrator; and a second feedback loop including a low pass filter for allowing a high dynamic range power control, the low pass filter having an input from the integrator and an output connected to the radio frequency power amplifier to provide a dynamically adjusted bias voltage causing a corresponding change in gain of the radio frequency power amplifier in response to the input control signal from the integrator.