While switch-mode audio power amplifiers allow compact implementations and high output power levels due to their high power efficiency, they are very well known for creating electromagnetic interference (EMI) with other electronic equipment, in particular radio receivers. Lowering the EMI of switch-mode audio power amplifiers while keeping the performance measures to excellent levels is therefore of high general interest. A modulator utilizing multiple carrier signals to generate a two level pulse train will be shown in this paper. The performance of the modulator will be compared in simulation to existing modulation topologies. The lower EMI as well as the preserved audio performance will be shown in simulation as well as in measurement results on a prototype.

Authors: Andersen, Michael A.E.; Knott, Arnold; Pfaffinger, Gerhard
Affiliations: Harman/Becker Automotive Systems GmbH;Technical University of Denmark(See document for exact affiliation information.)
AES Convention: 124 (May 2008) Paper Number: 7439
Publication Date: May 1, 2008
Subject: Software, Instrumentation, and Measurement

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