Abstract
Chapter 4 describes different inverse Class-F techniques using lumped and transmission-line elements including a quarterwave transmission line. Highly efficient inverse Class-F operation of the power amplifier can 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 providing ideally 100% collector (or drain) efficiency. In inverse Class-F power amplifiers analyzed in the frequency domain, the fundamental and harmonic load impedances are optimized by open-circuit peaking and short-circuit termination to control the voltage and current waveforms at the device output to obtain maximum efficiency. Design examples and practical RF and microwave inverse Class-F power amplifiers for different wireless applications are described and discussed.
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