High-Efficiency Power Amplifiers


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High-Efficiency Power Amplifiers
10105041010601 High-Efficiency Power AmplifiersHigh efficiency of the power amplifier can be obtained by using overdriven Class-B, Class-F, or Class-E operation modes and their subclasses, depending on the technical requirements. In all cases, an efficiency improvement in practical implementation is achieved by providing the nonlinear operation conditions when an active device can simultaneously operate in pinch-off, active, and saturation regions, resulting in the nonsinusoidal collector current and voltage waveforms, symmetrical for Class-F and asymmetrical for Class-E operation modes. In Class-F power amplifiers analyzed in a frequency domain, the fundamental-fre…
Citation
Andrei Grebennikov, Ph.D.: RF and Microwave Power Amplifier Design, Second Edition. High-Efficiency Power Amplifiers, Chapter (McGraw-Hill Professional, 2015), AccessEngineering Export