Patent ID: 7170341

Claim:
A power amplifier circuit comprising: a scalable power amplifier including an output, and a plurality of activated amplifier elements each operative to produce an RF output signal at the output, and operative to dynamically vary a power output level of the RF output signal in response to power output level data; a variable impedance circuit coupled to the output of the scalable power amplifier, and operatively responsive to the power output level data to vary an impedance of the variable impedance circuit to dynamically load the output of the scalable power amplifier; and wherein the scalable power amplifier further includes an amplifier configuration circuit operatively responsive to the power output level data to selectively activate the selectively activated amplifier elements by at least reducing power to at least one of the selectively activated amplifier elements and wherein the variable impedance circuit further includes an impedance configuration circuit operatively responsive to the power output level data to dynamically vary the impedance of the variable impedance circuit.