The Class-E RF Power Amplifier due to Nathan and Alan Sokal has an origin in ham radio.  See the speech given by Nathan Sokal (1929-2016) printed in the july/August 2018 issue of IEEE Microwave Magazine   here  .  

Here is an initial look at synthesizing and simulating an ideal Class-E RF power amplifier.  The first set of slides shows a simulation using an ideal FET and simple design equations for a conduction angle of 180 degrees.  The ideal FET model is detailed in the presentation  here .