A Design of 1.2–3.6 GHz Power Amplifier Based on Filters of Negative Feedback Network

This work proposes a broadband, high-efficiency extended continuous class-F (ECCF) power amplifier (PA) with a negative-feedback network structure. Compared with the traditional direct cascade connection of a PA and a filter, the design introduces a novel negative feedback filter structure. The transistor and filter synthesis network co-design method aims to compensate for the gain and efficiency drop of this PA in both high and low frequency bands, resulting in relatively flat gain and efficiency performance over a wide band. Consequently, there is a need to enhance the security and efficiency of wireless communication systems. This work verifies the proposed method using a designed and fabricated 10 W GaN HEMT device. The measured data reveal that the designed PA achieves 100% relative bandwidth from 1.2 GHz to 3.6 GHz, with a drain efficiency (DE) of 59.5~67.4%, an output power of 38.8~41.8 dBm, and a large signal gain of 8.8~11.8 dB.