Patent ID: 9391567
Filing Date: 2016-07-12
CPC Classification: H03F,H04B

Claim Text:
1. A power amplifier system comprising: a power amplifier configured to amplify a radio frequency input signal having a fundamental frequency, the power amplifier including an input configured to receive the radio frequency input signal and an output configured to generate an amplified radio frequency signal; and an output matching circuit including a second-order harmonic series resonant circuit electrically connected between the output of the power amplifier and a power low supply voltage, a third-order harmonic parallel resonant circuit electrically connected between the output of the power amplifier and a harmonic frequency grounding node, and a third-order harmonic series resonant circuit electrically connected between the harmonic frequency grounding node and the power low supply voltage, the third-order harmonic series resonant circuit configured to resonate at about three times the fundamental frequency so as to provide a low impedance path between the harmonic frequency grounding node and the power low supply voltage at about three times the fundamental frequency, the output matching circuit further including a supply voltage biasing circuit electrically connected between the output of the power amplifier and a power high supply voltage.