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Design, analysis and implementation of class-E ZCS/ZCDS power amplifier for any duty ratio with nonlinear output parasitic capacitance

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Abstract

This paper gives the design and analysis approaches for the class-E power amplifier with a shunt inductor under the nominal conditions, i.e., zero-current switching (ZCS) and zero-current derivative switching (ZCDS), with taking into account the MOSFET nonlinear output parasitic capacitance at any duty ratio. Although, the class-E ZCS/ZCDS conditions obtained high-efficiency, but the switch-current waveform affected by the slope of the voltage across the MOSFET nonlinear drain-to-source parasitic capacitance during the switch-off state, which restricted the operating frequency. On the other hand, the duty ratio is an adjustment parameter to obtain high-frequency operation. Therefore, the duty ratio and the MOSFET nonlinear output parasitic capacitance are required to satisfy the class-E ZCS/ZCDS conditions. The verification of the proposed analysis expressions is performed by fabricating of the class-E power amplifier with the output power 13.2-W at the operating frequency 4-MHz, and the laboratory experiments are performed, which achieved 90.9 % power conversion efficiency. The validity of proposed analytical expressions had been proved by the achieved good agreement between waveforms obtained from the PSpice-simulations and circuit laboratory experiments, which satisfied both ZCS and ZCDS conditions.

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Acknowledgments

The authors would like to thank Iran’s National Elites Foundation. This work was supported in part by a grant from Iran’s National Elites Foundation for the Post Doctoral Fellowship with Sharif University of Technology.

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  1. Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran

    Ali Lotfi & Ali Medi

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  1. Ali Lotfi
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Correspondence to Ali Lotfi.

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Lotfi, A., Medi, A. Design, analysis and implementation of class-E ZCS/ZCDS power amplifier for any duty ratio with nonlinear output parasitic capacitance. Analog Integr Circ Sig Process 89, 185–195 (2016). https://doi.org/10.1007/s10470-016-0812-3

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  • DOI: https://doi.org/10.1007/s10470-016-0812-3

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