Modified Asymmetrical Doherty Power Amplifier Based on Symmetrical Devices for 5G Applications

This paper presents a high efficiency Doherty power amplifier (DPA) for sub-6GHz 5G base station applications. A modified asymmetrical approach based on augmentation of asymmetrical drain bias and uneven power divider is proposed for enhancing output power back-off efficiency and compensating for the gain reduction issue associated with asymmetrical drain bias DPA. Simulation results show a drain efficiency of 43.2–52.4% at 10 dB output power back-off over the frequency band of 3.4–3.6 GHz.