Patent ID: 8072271
Filing Date: 2011-12-06
Classification: H03F

Abstract:
1. Radio frequency (RF) power amplifier circuitry comprising: a first transistor element adapted to amplify a first RF input signal to provide a first RF output signal from a first inverting output of the first transistor element; and a first load termination circuit coupled to the first inverting output and adapted to shape first amplitude-based amplitude modulation (AM-AM) distortion and first amplitude-based phase modulation (AM-PM) distortion to extend a linear operating range of the first transistor element, the first transistor element and the first load termination circuit form a first amplifier stage adapted to receive the first RF input signal, wherein the first RF input signal has a first carrier frequency; and a first impedance valley associated with the first load termination circuit is not coincident with a second harmonic of the first carrier frequency.