Design of Symmetrical Class E Power Amplifiers for Very Low Harmonic-Content Applications

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)1684-1690
Journal / PublicationIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number8
Online published15 Aug 2005
Publication statusPublished - Aug 2005
Externally publishedYes


Class E power amplifier circuits are very suitable for high efficiency power amplification applications in the radio-frequency and microwave ranges. However, due to the inherent asymmetrical driving arrangement, they suffer significant harmonic contents in the output voltage and current, and usually require substantial design efforts in achieving the desired load matching networks for applications requiring very low harmonic contents. In this paper, the design of a Class E power amplifier with resonant tank being symmetrically driven by two Class E circuits is studied. The symmetrical Class E circuit, under nominal operating conditions, has extremely low harmonic distortions, and the design of the impedance matching network for harmonic filtering becomes less critical. Practical steady-state design equations for Class E operation are derived and graphically presented. Experimental circuits are constructed for distortion evaluation. It has been found that this circuit offers total harmonic distortions which are about an order of magnitude lower than those of the conventional Class E power amplifier. © 2005 IEEE.

Research Area(s)

  • Class E power amplifier, push-pull amplifier, resonant converter, harmonic distortion