Emission reduction in Class D audio amplifiers by optimizing spread spectrum modulation

Bernd Deutschmann, Gunter Winkler, Timucin David Karaca

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

Abstract

Due to their high efficiency compared to conventional Class AB amplifiers, Class D audio amplifiers have increasingly become the amplifier of choice especially for low power applications such as portable electronics. However, Class D amplifiers are still a major source of electromagnetic emission of the electronic applications in which they are used. In this paper the benefits of using spread spectrum techniques in order to reduce the emission of Class D audio amplifiers is highlighted. Based on IC-level measurement results of a 10W Mono Class D speaker amplifier, that allows to be synchronized to an external clock, it is shown how spread spectrum parameters like deviation, modulation frequency and modulation signal can be optimized in order to maximize the reduction of the emission.
Original languageEnglish
Title of host publication 2015 10th International Workshop on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo)
PublisherInstitute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)978-1-4673-7897-0
Publication statusPublished - Nov 2015
EventInternational Workshop on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo) - Edinburgh, United Kingdom
Duration: 10 Nov 201513 Nov 2015

Conference

ConferenceInternational Workshop on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo)
CountryUnited Kingdom
CityEdinburgh
Period10/11/1513/11/15

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Keywords

  • Class D Audio Amplifier
  • Common Mode Emission
  • IEC 61967
  • Spread Spectrum Technique
  • EMI

Fields of Expertise

  • Information, Communication & Computing

Treatment code (Nähere Zuordnung)

  • Experimental

Cite this

Deutschmann, B., Winkler, G., & Karaca, T. D. (2015). Emission reduction in Class D audio amplifiers by optimizing spread spectrum modulation. In 2015 10th International Workshop on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo) Institute of Electrical and Electronics Engineers.