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Modeling Distortion Effects in Class-D Amplifier Filter Inductors

Distortion is generally accepted as a quantifier to judge the quality of audio power amplifiers. In switch-mode power amplifiers various mechanisms influence this performance measure. After giving an overview of those, this paper focuses on the particular effect of the nonlinearity of the output filter components on the audio performance. While the physical reasons for both, the capacitor and the inductor induced distortion are given, the practical in depth demonstration is done for the inductor only. This includes measuring the inductors performance, modeling through fitting and resulting into simulation models. The fitted models achieve distortion values between 0.03 % and 0.2 % as a basis to enable the design of a 200 W amplifier.

Authors: Knott, Arnold; Stegenborg-Andersen, Tore; Thomsen, Ole C.; Bortis, Dominik; Kolar, Johann W.; Pfaffinger, Gerhard; Andersen, Michael A. E.
Affiliations: Harman/Becker Automotive Systems GmbH, Straubing, Germany; Swiss Federal Institute of Technology in Zurich, Zurich, Switzerland; Technical University of Denmark, Lyngby, Denmark(See document for exact affiliation information.)
AES Convention:128 (May 2010) Paper Number:7997 Import into BibTeX
Subject:Audio Equipment and Emerging Technologies

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