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.
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
No AES members have commented on this paper yet.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.