Patent ID: 9537452
Date: 2017-01-03
CPC Classifications: H03F,H04B

Claim:
1. A power amplifier comprising: an amplifier circuit configured to receive a radio frequency signal and provide an amplified radio frequency signal over a frequency band of operation; and a tunable output matching network electrically connected to the amplifier circuit to receive the amplified radio frequency signal, the tunable output matching network including first and second passive components configured in series with each other and with a first switch, a third passive component configured in series with a second switch, and a fourth passive component configured in series with a third switch, the first, second, and third switches configured to operate to provide second-order harmonic rejection for the amplified radio frequency signal when the amplifier circuit operates in a low frequency band, the first, second, third, and fourth passive components selected from the group consisting of inductors and capacitors.