Characterization of EMI-Reducing Spread-Spectrum Techniques for Class-D Audio Amplifiers

Timucin David Karaca, Mario Auer

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


Audio amplifiers for portable devices need to be
power efficient, therefore Class-D amplifiers are used. These
amplifiers employ a switching output stage, so that they generally
produce a significant amount of EMI. Filtering these frequency
components usually is not an option since the amplifiers have to
be small and lightweight. A reduction of EMI can be achieved by
using spread-spectrum techniques that distribute the emissions
over a wider frequency range. Unfortunately spread-spectrum
techniques can impact the audio performance. This work presents
a test setup for a Class-D prototype to evaluate different spread-spectrum
methods by measurement or even by listening to the
audio output. Using this setup several spread-spectrum methods
are compared in terms of EMI-reduction and audio performance.
Original languageEnglish
Title of host publication2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)
PublisherInstitute of Electrical and Electronics Engineers
Number of pages793
ISBN (Electronic)978-1-4673-9494-9
ISBN (Print)978-1-4673-8310-3
Publication statusPublished - 2016
EventAsia-Pacific International Symposium on Electromagnetic Compatibility & Signal Integrity (APEMC) - Shenzhen, China
Duration: 18 May 201621 May 2016


ConferenceAsia-Pacific International Symposium on Electromagnetic Compatibility & Signal Integrity (APEMC)


  • Class-D audio amplifier
  • spread spectrum modulation
  • EMI
  • Prototyping

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Treatment code (Nähere Zuordnung)

  • Experimental

Cite this