Design of Novel High-Efficiency Inverse Class-E Power Amplifier

In this study, we provide a theoretical examination of an innovative inverse Class-E power amplifier (PA) incorporating a shunt filter to achieve optimal performance. We derive idealized waveforms and load parameters, verifying these through frequency domain simulations. The findings indicate that the performance of inverse Class-E PA does not consistently increase with higher parasitic output capacitance. The ideal switch voltage and current waveforms suggest the potential for reaching 100% efficiency. We offer design examples using both lumped elements and transmission lines. To validate our theoretical predictions, we conducted measurements on the transmission line inverse Class-E. The simulation and measurement results closely align, showing a maximum drain efficiency of 82%/81% and a power-added efficiency of 75%/74.8%. Furthermore, an output power of 40.5/40.3 dBm and a power gain of 11.0/10.3 dB were achieved in the saturation region.