High frequency amplifier

Abstract

A high frequency amplifier 1 includes an input terminal PIN, an output terminal POUT, a transistor 5 configured to amplify an RF signal applied to the input terminal PIN, a matching circuit 9 for a fundamental of the RF signal and a reflection circuit 7 for a harmonic relative to the fundamental, the matching circuit 9 and the reflection circuit 7 being connected in series between the transistor 5 and the output terminal POUT, an extraction circuit 13 configured to extract a harmonic appearing at the output terminal POUT, processing circuits 15, 17 configured to adjust a phase and intensity of the harmonic extracted by the extraction circuit 13, and a multiplexing circuit 19 configured to multiplex the harmonic processed by the processing circuits 15, 17 to the harmonic reflected by the reflection circuit 7 and give the multiplexed harmonic to the transistor 5.

Dependencies are inferred from the claim text.