The design of a clocked analog controlled pulse-width modulated class-D audio amplifier with global negative feedback is presented. The analog control loop is designed in the z-domain by modeling the comparator as a sampling operation. A method is presented to improve clip recovery and ensure stability during over-modulation. Loop gain is shaped to provide a high gain across the audio band, and ripple compensation is implemented to minimize the negative effect of ripple feedback. Experimental results are presented.

Authors: Kemp, Pieter; Mouton, Toit; Putzeys, Bruno
Affiliations: Hypex Electronics B.V, Groningen, The Netherlands.; University of Stellenbosch, Matieland, South Africa(See document for exact affiliation information.)
AES Convention: 131 (October 2011) Paper Number: 8468
Publication Date: October 19, 2011
Subject: Posters: Transducers

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