Abstract
This chapter describes the historical aspects and modern trends of a Class-E power amplifier design. The switchmode Class-E power amplifiers with shunt capacitance have found widespread application because of their design simplicity and high-efficiency operation. Their load-network configuration consists of a shunt capacitor, a series inductor, and a series filter tuned to the fundamental frequency to provide a high level of harmonic suppression. In the Class-E power amplifier, the transistor operates as an on-to-off switch, and the shapes of the current and voltage waveforms provide a condition in which the high current and high voltage do not occur simultaneously. That minimizes the power dissipation and maximizes the power amplifier efficiency. Different circuit configurations and load-network techniques using the push-pull mode, lumped elements, and transmission lines are analyzed. The effects of the power-transistor saturation resistance, finite switching time, and nonlinear shunt capacitance are described. The practical radio frequency and microwave Class-E power amplifiers and their applications are given and discussed.
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