First-Pass Design of Broadband Doherty Power Amplifier

Abstract

In this work, a first-pass wideband Doherty power amplifier (DPA) has been designed using Wolfspeed's 10W GaN transistors. The entire design process is described. A combined network structure was designed with high and low impedance matching techniques, and the DPA is designer with a blocked optimization of the EM simulation. The fabricated DPA achieves a saturation output power up to 44.6 dBm in the 2.0-2.4 GHz frequency range, with a saturation drain efficiency (DE) over 53% and a 6 dB output power back-off (OBO) efficiency of more than 42%, which verifies the effectiveness of the first-pass broadband DPA design method.