Class-E, Class-C, and Class-F power amplifiers based upon a finite number of harmonics

By Frederick H. Raab. 2001

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On the Continuity of High Efficiency Modes in Linear RF Power Amplifiers (2009, neutral): “Cripps [1] following Rhodes [3] and earlier work by Raab [4] has promoted a “Class J” mode which allows for a substantial second harmonic reactive component, but simultaneously 1531-1309/$26.00 © 2009 IEEE requires a reactive component at the fundamental in order to keep the voltage wave above zero.”
High-Efficiency Harmonically Terminated Diode and Transistor Rectifiers (2012, background): “Other PA modes of operation specify open or short 0018-9480/$31.00 © 2012 IEEE provides dc isolation between the microwave source and rectifying element.”
Theoretical Analysis of RF-DC Conversion Efficiency for Class-F Rectifiers (2014, methodology): “In a high-efficiency Class-F power amplifier, the harmonic termination circuit with low impedance at even harmonics and high impedance at odd harmonics is used to shape the current and voltage waveforms across the transistor to minimize their overlap and improve the circuit efficiency.”
Power amplifiers and transmitters for RF and microwave (2002, background): “However, the harmonic impedances are not critical [13], and many variations are, therefore, possible .”
Analysis and experiments for high-efficiency class-F and inverse class-F power amplifiers (2006, background): “Using (1), (2), (4), and (5), the efficiencies of the class-F and inverse class-F amplifiers can be easily calculated as follows:”