Analysis of Class-DE Amplifier With Linear and Nonlinear Shunt Capacitances at 25% Duty Ratio

Sekiya, Hiroo; Sagawa, Natsumi; Kazimierczuk, Marian K.

doi:10.1109/tcsi.2010.2043013

Cited by 11 publications

(1 citation statement)

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“…Although these restrictions can be solved by inserting the linear external parallel capacitance, but this design approach needs to tune with an accurate value of these components using a complicated procedure. In [21] and [22], two types of the class-DE PA configuration with a linear external and nonlinear parasitic capacitance in parallel configuration with two same MOSFETs devices are defined. In this configuration, the required parallel capacitances become considerable as the operating frequency is raised.…”

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confidence: 99%

Analysis of Class-DE PA Using MOSFET Devices With Non-Equally Grading Coefficient

Lotfi

Katsuki

Kurokawa

et al. 2019

IEEE Trans. Circuits Syst. I

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The design and analysis of a new operation-mode of the class-DE power amplifier (PA) using two MOSFETs with the non-equal grading coefficient is introduced. The PA uses the optimum shunt capacitance for each MOSFET to achieve zero voltage switching (ZVS) condition and wide range for the loadresistance point of view. As compared with the conventional class-DE PA, this configuration has low value of the series inductance that is reduced the power dissipation. A design procedure with intuitive curves is obtained that are implemented using a different grading coefficient for two MOSFETs. These criteria prepared an effective approach regardless of the fixed shunt capacitance for achieving ZVS condition. The desired operation of the class-DE PA is guaranteed by converging of design parameters and required output power. Moreover, non-similar switches provide reduced switch power dissipations and the number of the driving circuit PA. The simulation and experiment results are approved by implementing the outlined theoretical relationships for a fabricated class-DE PA at 4-MHz switching frequency and obtained 12.1-W output power.

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confidence: 99%