Modeling Distortion Effects in Class-D Amplifier Filter Inductors

Arnold Knott, Tore Stegenborg-Andersen, Ole Cornelius Thomsen, Dominik Bortis, Johann W. Kolar, Gerhard Pfaffinger, Michael A. E. Andersen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Distortion is generally accepted as a quantifier to judge the quality of audio power amplifiers. In switchmode 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.
Original languageEnglish
Title of host publication128th Audio Engineering Society Convention
Publication date2010
ISBN (Print)978-0-937803-74-5
Publication statusPublished - 2010
Event128th Audio Engineering Society Convention - London, United Kingdom
Duration: 22 May 201025 May 2010
Conference number: 128


Conference128th Audio Engineering Society Convention
Country/TerritoryUnited Kingdom
Internet address


Dive into the research topics of 'Modeling Distortion Effects in Class-D Amplifier Filter Inductors'. Together they form a unique fingerprint.

Cite this