A broadband high-efficiency doherty power amplifier with continuous inverse class-F design

Abstract

This paper presents a broadband Doherty power amplifier (DPA) design with two continuous Class-F-1 matching circuit eliminating offset line in carrier way to increase the bandwidth and efficiency. By employing this compact and highly efficient design method, a DPA working at 2.0 GHz~2.6 GHz is designed and implemented for verification. With continuous wave (CW) measurements, the experimental results show the maximum output power of 43.8dBm and 75% drain efficiency for this DPA. At 6dB back-off power range, higher than 50% efficiency is presented over 500MHz. Moreover, 40 MHz long term evolution (LTE) modulated signals are applied for and digital pre-distortion (DPD) to evaluate its linearization performance. At an average output power around 34 dBm operated at 2.15 GHz and 2.55 GHz, lower than -50 dBc adjacent leak power ratio (ACLR) can be achieved.