Analysis and Design of Class DE Amplifier with Nonlinear Shunt Capacitance

This paper presents the analysis and design of class DE amplifier with nonlinear shunt capacitance. In the past, the researchers clarified class DE amplifier with linear shunt capacitance analytically. For higher frequency operation, however, lower shunt capacitance is required for the design. In this case, shunt capacitance has nonlinearity because of output capacitance of MOSFET. Therefore, it is important to clarify the effect of this nonlinearity to the operation of class DE amplifier analytically. In this paper, analytical expressions are derived as waveforms and design equations. From this analysis, it is clarified that the nonlinearities of shunt capacitances affect the waveforms in the dead-time intervals. The validity of our analysis is confirmed by PSpice simulations and experiments.