An Ultrawideband Resistive-Reactive Continuous-Mode Class B/J Power Amplifier With Input Nonlinearity Modulation

This letter proposes a novel RGCB/J mode power amplifier (PA) by incorporating input nonlinearity into the resistive-reactive continuous class B/J mode (RRCB/J). The impact of input nonlinearity on output current waveform controllability and output impedance characteristics is systematically analyzed. Theoretical results demonstrate that the proposed mode can further improve efficiency while maintaining the PA bandwidth. To validate the proposed theory, an ultrawideband PA was designed using Wolfspeed’s GaN transistor (CGH40010F). The measurement results show excellent performance across 0.7–3.7 GHz, achieving drain efficiency (DE) of 56%–72.8% with output power ( $P_{\text {out}}$ ) maintained at 39.7–42 dBm.