Optimised MOSFETs Design for EMC Performance

The damping factor is a parameter used in MOSFET silicon design that directly relates to the ringing produced by MOSFETs fast switching transitions. This paper investigates the impact the damping factor has on EMC (electro-magnetic compatibility) per-formance. The paper highlights the three main phases covering the full design cycle: the study, simula-tion and lab measurement. Correlation of the results between the study and simulation will be validated through lab measurement. Waveforms showing damping and ringing of a MOSFET switching transition are obtained from double pulse test, and EMC performance evaluation is obtained from DC/DC and BLDC test applications. The aim is to identify the damping factor that achieves optimum MOSFET design for best EMC performance.