基于回退点复阻抗设计的连续逆F类Doherty功率放大器

his paper presents an improved continuous inverse Class-F broadband Doherty power amplifier (DPA) design methodology to enhance the bandwidth and back-off efficiency. By analyzing and modeling the reactance effect of the auxiliary power amplifier (APA) in the cut-off state, the complex impedance is determined as the load impedance of the main power amplifier at the back-off point. Further, the main power amplifer (MPA) is designed working in continuous inverse Class-F mode. While the performance of the band edge shows good consistency, it also maintains high efficiency at 8 dB back-off level. To verify the theory, gallium nitride (GaN) power amplifiers CGH40025F and CG2H40010F from Wolfspeed were used. The simulation results show that the DPA's working band is 1.8 - 2.7 GHz, while the saturated output power ranges from 44.6 dbm to 45.8 dBm, the efficiency is between 52\% and 64\% at 8 dB back-off region with a gain of 8-9 dB.