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

Mario Auer, Timucin David Karaca

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

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.
Originalspracheenglisch
Seiten (von - bis)43-47
Fachzeitschrifte&i - Elektrotechnik und Informationstechnik
Jahrgang133
Ausgabenummer1
PublikationsstatusVeröffentlicht - Feb 2016

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Modulation
Pulse width modulation
Networks (circuits)

Schlagwörter

    Fields of Expertise

    • Information, Communication & Computing

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    Spread spectrum techniques for Class-D audio amplifiers to reduce EMI. / Auer, Mario; Karaca, Timucin David.

    in: e&i - Elektrotechnik und Informationstechnik, Jahrgang 133, Nr. 1, 02.2016, S. 43-47.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    AB - 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.

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