Abstract
The switched-mode Class-E tuned power amplifiers with a shunt capacitance have found widespread application because of their design simplicity and high-efficiency operation. Their load network configuration consists of the shunt capacitance, series inductance, and 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 when the high current and the high voltage do not overlap simultaneously that minimizes the power dissipation and maximizes the power-amplifier efficiency. This chapter presents the historical aspect and modern trends of a Class-E power-amplifier design. Different circuit configurations and load network techniques using the push-pull mode, lumped, and transmission-line elements are analyzed in the chapter. The effect of the device saturation resistance, finite switching time, and nonlinear shunt capacitance is described in the chapter. The practical radio frequency (RF) and microwave Class-E power amplifiers and their applications are discussed in the chapter.
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