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Analysis of Class-DE PA Using MOSFET Devices With Non-Equally Grading Coefficient
Abstract
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 load-resistance 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.</p- article
- MOSFET
- power amplifiers
- switching convertors
- zero voltage switching
- grading coefficient
- ZVS condition
- conventional class-DE PA
- fabricated class-DE PA
- driving circuit PA
- switch power dissipations
- nonsimilar switches
- required output power
- fixed shunt capacitance
- design procedure
- power dissipation
- optimum shunt capacitance
- nonequal grading coefficient
- class-DE power amplifier
- MOSFET devices
- Switches
- Zero voltage switching
- Power dissipation
- Junctions
- Parasitic capacitance
- Class-DE power amplifier
- switch stress
- zero voltage switching (ZVS)
- zero-derivative switching (ZDS)
- loaded-quality factor
- high efficiency
- load-resistance
- Class-DE power amplifier
- high efficiency
- load-resistance
- loaded-quality factor
- switch stress
- zero voltage switching (ZVS)
- zero-derivative switching (ZDS)