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

Lotfi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s10470-016-0812-3
  3. Publisher: Springer New York LLC
  4. Abstract:
  5. 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
  6. Keywords:
  7. Class-E conditions ; MOSFET nonlinear output capacitance ; Power conversion efficiency ; Shunt inductor ; Zero current derivative switching (ZCDS) ; Zero-Current Switching (ZCS) ; Capacitance ; Conversion efficiency ; Drain current ; Efficiency ; MOSFET devices ; Nonlinear analysis ; Power MOSFET ; SPICE ; Switching ; Class E ; MOS-FET ; Zero-Current-Derivative Switching ; Power amplifiers
  8. Source: Analog Integrated Circuits and Signal Processing ; Volume 89, Issue 1 , 2016 , Pages 185-195 ; 09251030 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10470-016-0812-3