DC-DC buck converter EMI reduction using PCB layout modification

Ankit Bhargava*, David Pommerenke, Keong W. Kam, Federico Centola, Cheng Wei Lam

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The paper treats the effect of layout on the electromagnetic interference (EMI) of buck converters. An optimized layout design for dc-dc synchronous buck converter is proposed for EMI reduction. Six different layout versions are analyzed with respect to loop area, loop inductance, radiating dipole moments, and far-field radiation. Optimizations are done with respect to field-effect transistor (FET), decoupling capacitor and via placement. Passive full-wave simulations are used to estimate and verify the loop inductance and far-field emissions. Those are compared with measurements. A gigahertz transverse electromagnetic (GTEM) cell is used to quantify the dipole moments in the printed circuit board (PCB) for estimating the far field and comparing to measurement.

Original languageEnglish
Article number5948375
Pages (from-to)806-813
Number of pages8
JournalIEEE Transactions on Electromagnetic Compatibility
Issue number3
Publication statusPublished - 1 Aug 2011
Externally publishedYes


  • DC-DC buck converter
  • loop inductance
  • PCB layout

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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