volume | PIER Journals

Abstract

This paper proposes a mode-reconfigurable Doherty power amplifier (DPA). By merely exchanging the transistors' gate bias without altering the corresponding circuits, this power amplifier can achieve two different frequency-band DPA modes, enabling wide bandwidth implementation in DPAs Utilizing a single load modulation network. Simultaneously, PIN switches are utilized to improve the amplifier's bandwidth and drain efficiency during mode switching. To validate this approach, a mode-reconfigurable DPA was designed and fabricated using commercial GaN transistors. A reconfigurable Doherty power amplifier with mode 1 operating in the frequency bands of 2.5-2.9 GHz and 3.3-3.7 GHz, mode 2 operating in the frequency band of 2.8-3.4 GHz, with a drain efficiency ranging from 60.2% to 70.2%, a 6 dB output power reduction resulting in a drain efficiency of 43.5% to 53.7%, a gain between 9.4 and 11.3 dB and a saturated output power between 39.4 and 41.3 dBm. This straightforward architecture offers a promising approach for implementing Doherty power amplifiers in 5G frequency bands.

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Dr. Shiwei Zhao

Dr. Longfei Zhou

Dr. Linsong Li

Dr. Fei Zhao