Abstract
The highly efficient operation of power amplifier can be obtained by applying biharmonic or polyharmonic modes when an additional single-resonant or multi-resonant circuit tuned to the odd harmonics of the fundamental frequency is added into the load network. An infinite number of odd-harmonic resonators result in an idealized Class-F mode with a square voltage waveform and a half-sinusoidal current waveform at the device output terminal. In Class-F power amplifiers analyzed in 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 to obtain maximum efficiency. This chapter analyzes different Class-F techniques using lumped and transmission-line elements, including a quarter-wave transmission line. The effect of the saturation resistance and parasitic shunt capacitance is demonstrated in the chapter. The design examples and practical radio frequency (RF) and microwave Class-F power amplifiers are discussed in the chapter.
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