IEICE Communications Express
Online ISSN : 2187-0136
ISSN-L : 2187-0136
Load impedance perturbation formulas for class-E power amplifiers
Takashi Ohira
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2020 Volume 9 Issue 10 Pages 482-488

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Abstract

This paper considers how a class-E amplifier behaves when the load deviates from its nominal impedance. The Kirchhoff’s law and Fourier series formulate the circuit into three simultaneous equations. These equations are decomposed into zeroth- and first-order terms to apply the perturbation technique. The zeroth-order solutions meet the zero-voltage and zero-current switching conditions. The first-order formulas express the DC current consumption, RF output amplitude and phase, equivalent output impedance, and periodic turn-on power dissipation in terms of the load resistance and reactance deviations.

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© 2020 The Institute of Electronics, Information and Communication Engineers
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