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This 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. |
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Keywords:RF power amplifier; Continuous Inverse Class-F Doherty; Broadband; High Efficiency |
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