Digitally assisted EMI-reduction techniques for Class-D amplifiers with digital control

Mario Auer, Timuçin Karaca

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


Class-D amplifiers are known for their excellent efficiency but also for their high potential to produce electromagnetic interference (EMI). Typically Class-D amplifiers operate in the analog domain, but there is a clear trend to replace some of the functionality by digital circuitry, requiring new approaches to reduce their emissions. In this paper a prototype of a digitally controlled Class-D amplifier is used to present digital techniques to reduce EMI with various methods. A new method is realized and the advantages of digitally assisted EMI reduction methods are demonstrated. Measurement results show that a considerable (up to 17.8 dB) reduction of EMI is possible taking advantage of digitally assisted EMI reduction techniques while delivering state-of-the art audio performance.

Original languageEnglish
Title of host publicationProceedings of the 2017 11th International Workshop on the Electromagnetic Compatibility of Integrated Circuits, EMCCompo 2017
PublisherInstitute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)9781538626894
Publication statusPublished - 31 Jul 2017
Event11th International Workshop on the Electromagnetic Compatibility of Integrated Circuits: EMC Compo 2017 - St. Petersburg, Russian Federation
Duration: 4 Jul 20178 Jul 2017
Conference number: 11


Conference11th International Workshop on the Electromagnetic Compatibility of Integrated Circuits
Abbreviated titleEMC Compo 2017
Country/TerritoryRussian Federation
CitySt. Petersburg


  • Characterization
  • Class-D Audio Amplifier
  • Digital Class-D
  • EMC
  • EMI
  • Prototyping
  • Spread Spectrum Modulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Safety, Risk, Reliability and Quality
  • Electronic, Optical and Magnetic Materials

Fields of Expertise

  • Information, Communication & Computing

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