Simulating the Conducted EM Emissions of a Synchronous Buck Converter using an 80V GaN Half Bridge Power Stage

Abstract

A recently published paper [1] on the analytical modeling of the conducted EM Emissions of a synchronous Buck converter for different voltage ratios demonstrates a behavioral model to predict the emitted spectrum for GaN and SiC based buck converters. The results show reasonable agreement between analytical predicted and measured conducted EM spectrum. This presentation shows an alternative methodology focusing on the layout implementation of the converter stage based on a commercially available EM extraction tool. This solution benefits from a respective switch model included in the software, offering a fast representation of the switching behavior without the need of using SPICE models for the switching devices. The results indicate that this methodology enables accurate prediction of the conducted EM spectrum on a virtual level, offering a deeper insight into the parasitic effects of the layout and can reduce the number of hardware iteration cycles.