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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 9

Alternative and Mixed-Mode High-Efficiency Power Amplifiers

Introduction

In this chapter, the different alternative and mixed-mode configurations of high-efficiency power amplifiers are presented. 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. Effects of the saturation resistance and nonlinear capacitance, driving waveforms, and some practical examples of Class-DE power amplifiers are discussed. The switchmode Class-FE or Class-E/F power amplifier can provide lower voltage peak factors when zero voltage and zero voltage-derivative conditions, corresponding to Class-E mode required to ...

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