Patent ID: 9503025
Filing Date: 2016-11-22
CPC Classification: H03F,H04W,Y02D

Claim Text:
1. A power amplifier system comprising: a power amplifier transistor configured to receive a radio frequency signal at an input terminal and provide an amplified radio frequency signal at an output terminal; an envelope tracking modulator and a parallel LC circuit coupled between the envelope tracking modulator and the output terminal of the power amplifier transistor, the envelope tracking modulator configured to provide a supply voltage to the power amplifier transistor by way of the parallel LC circuit; an input termination circuit coupled to the input terminal of the power amplifier transistor, the input termination circuit configured to provide a short circuit at a second harmonic of the radio frequency signal; a termination circuit coupled to the output terminal of the power amplifier transistor, the termination circuit configured to provide a short circuit at a second harmonic of the amplified radio frequency signal; and a resonant circuit coupled to the output of the power amplifier transistor, the resonant circuit configured to provide an open circuit at a third harmonic of the amplified radio frequency signal.