A Broadband High Efficiency Class-J Power Amplifier with a Novel Output Matching Method

This paper presents a new method to design broadband high efficiency Class-J power amplifiers (JPAs). The wideband output matching network (OMN) is designed with a new simplified output impedance calculation method by using a two-port network. For demonstration, a broadband high efficient Class-J power amplifier based on proposed method is implemented using Cree 10-W packaged GaN HEMT devices. Measurement results show that 64%-68% drain efficiency is achieved and between 40-41.6 dBm output power with more than 10 dB gain over the frequency band of 1.2-2.6 GHz, the proposed amplifier has an ACPR between - 27.5 and -32.4 dBc over the entire band.