Spread spectrum techniques for Class-D audio amplifiers to reduce EMI

Mario Auer, Timucin David Karaca

Research output: Contribution to journalArticle


For battery powered portable devices it is required to have circuits that combine high efficiency with a small footprint. In the case of Class-D amplifiers the high efficiency can be achieved by applying pulse-width modulation (PWM) to generate the desired output signal. Classical PWM requires an output filter to suppress the idle current. In order to avoid this filter a different modulation scheme is used, which however introduces a larger amount of electromagnetic emissions. Therefore spread-spectrum techniques are applied to distribute the emissions over a wider frequency range. In this article methods are discussed that allow the use of spread-spectrum modulation without introducing audible artifacts due to the modulation.
Original languageEnglish
Pages (from-to)43-47
Journale&i - Elektrotechnik und Informationstechnik
Issue number1
Publication statusPublished - Feb 2016


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

Fields of Expertise

  • Information, Communication & Computing

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  • Projects

    LEAD - LEAD-Low Emission Analog Design

    Auer, M.


    Project: Research project

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