Patent ID: 8164387
Filing Date: 2012-04-24
Classification: H03F

Abstract:
1. A circuit comprising: a push-pull power amplifier configured to amplify a differential signal, the push-pull amplifier having a plurality of output stage transistors including a first transistor and a second transistor; a harmonic tuning network coupled with the push-pull power amplifier and having at least one inductor and/or capacitor (L/C) segment configured to simultaneously terminate second-harmonic energy residing in common mode current flows and third-harmonic energy residing in differential mode current flows; a transformer coupled with the harmonic tuning network; a first transmission line coupled with the first transistor, the harmonic tuning network, and the transformer; and a second transmission line coupled with the second transistor, the harmonic tuning network, and the transformer, wherein the harmonic tuning network is coupled between the first transmission line and the second transmission line.