Design of wideband high‐efficiency power amplifier based on continuous inverse modes

Abstract

This paper presents a wideband high-efficiency power amplifier (PA) based on novel continuous inverse modes (NCIMs). The NCIMs mainly provides a wider impedance design space by introducing freedom factors. More importantly, a combination of two frequency-point harmonic-tuned network and fundamental reactance compensation matching networks is employed simply to design a broadband output matching network for achieving a broadband high-efficiency goal. Eventually, for the sufficient verification, a broadband high-efficiency PA achieves a measured 112.2% bandwidth from 0.9 to 3.2 GHz, while delivering an outstanding performance of 10 to 12.3 dB gain, 60.7% to 84.1% drain efficiency, and 40 to 42.3 dBm output power over the entire frequency band. Furthermore, when driven by a 40 MHz four-carrier OFDM modulation signal, the adjacent channel power ratio (ACPR) is measured better than − 46.3 dBc across the band with digital pre-distortion technology.