EMC guideline for synchronous buck converter design

Keong Kam*, David Pommerenke, Federico Centola, Cheung Wei Lam, Robert Steinfeld

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


Synchronous buck converters generate broadband noise typically in 50 - 300 MHz range. In this paper, the root cause of this broadband noise and possible coupling mechanisms are analysed. Then, a list of EMC design guideline for minimizing the broadband noise is presented. The guideline contains circuit level guideline which involves input filtering, component selection, and an effective snubber strategy using a parallel resistor and inductor. The guideline also contains layout level guideline, which involves decoupling capacitor placement, layer stackup, and minimizing exposed phase voltage area. For each suggested guideline item, an example illustrates the impact of the particular strategy through experimental results or SPICE simulations, leading to a strong reduction of broadband noise from the synchronous buck converter.

Original languageEnglish
Title of host publication2009 IEEE International Symposium on Electromagnetic Compatibility, EMC 2009
Number of pages6
Publication statusPublished - 1 Dec 2009
Externally publishedYes
Event2009 IEEE International Symposium on Electromagnetic Compatibility: EMC 2009 - Austin, United States
Duration: 17 Aug 200921 Aug 2009

Publication series

NameIEEE International Symposium on Electromagnetic Compatibility
ISSN (Print)1077-4076


Conference2009 IEEE International Symposium on Electromagnetic Compatibility
Country/TerritoryUnited States


  • Broadband EMI
  • SMPS
  • Snubber
  • Synchronous buck converter

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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