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Switchmode RF and Microwave Power Amplifiers, 2nd Edition by Marc J Franco, Nathan O. Sokal, Andrei Grebennikov

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Chapter 4

Inverse Class-F

Introduction

Highly efficient operation of the power amplifier can also be obtained by applying biharmonic or polyharmonic modes when an additional single-resonant or multi-resonant circuit tuned to the even harmonics of the fundamental frequency is added into the load network. An infinite number of even-harmonic resonators results in an idealized inverse Class-F mode with a half-sinusoidal voltage waveform and a square current waveform at the device output terminal. In inverse Class-F power amplifiers analyzed in the frequency domain, the fundamental and harmonic load impedances are optimized by short-circuit termination and open-circuit peaking to control the voltage and current waveforms at the device output in ...

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