Embrace circuit nonlinearity to get transmitter linearity and energy efficiency

Abstract form only given. Following a review of why the design of transmitter power amplifiers is getting more complicated, a reverse approach to the usual design approach is presented: instead of starting with a linear circuit and then working to improve its energy efficiency, rather begin with a maximally energy efficient circuit and work to make it support all the signals we require from the transmitter. New design methods are introduced to support this inverted development procedure. Gain, stability, power control, and long term ageing results are presented.