Abstract
This chapter presents the different alternatives and mixed-mode configurations of high-efficiency power amplifiers. A Class-DE power amplifier is based on the combination of a voltage-switching Class-D mode with Class-E switching conditions, thus extending the switching Class-D operation to higher frequencies. The effects of the saturation resistance and nonlinear capacitance, driving waveforms, and some practical examples of Class-DE power amplifiers are discussed in the chapter. The switched-mode Class-E/F power amplifier can provide lower voltage peak factors when zero voltage and zero voltage-derivative conditions corresponding to Class-E mode are accompanied by harmonic tuning. Also, the biharmonic Class-EM mode is described in the chapter, which can eliminate the efficiency degradation of a Class-E operation mode at higher frequencies because of the increased switching power losses with increasing values of the turn-off switching time.
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