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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.
Author (s): Kemp, Pieter; Mouton, Toit; Putzeys, Bruno
Affiliation:
Hypex Electronics B.V, Groningen, The Netherlands.; University of Stellenbosch, Matieland, South Africa
(See document for exact affiliation information.)
AES Convention: 131
Paper Number:8468
Publication Date:
2011-10-06
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Session subject:
Posters: Transducers
Permalink: https://aes2.org/publications/elibrary-page/?id=15994
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Kemp, Pieter; Mouton, Toit; Putzeys, Bruno; 2011; High-Order Analog Control of a Clocked Class-D Audio Amplifier with Global Feedback Using Z-Domain Methods [PDF]; Hypex Electronics B.V, Groningen, The Netherlands.; University of Stellenbosch, Matieland, South Africa; Paper 8468; Available from: https://aes2.org/publications/elibrary-page/?id=15994
Kemp, Pieter; Mouton, Toit; Putzeys, Bruno; High-Order Analog Control of a Clocked Class-D Audio Amplifier with Global Feedback Using Z-Domain Methods [PDF]; Hypex Electronics B.V, Groningen, The Netherlands.; University of Stellenbosch, Matieland, South Africa; Paper 8468; 2011 Available: https://aes2.org/publications/elibrary-page/?id=15994
@article{kemp2011high-order,
author={kemp pieter and mouton toit and putzeys bruno},
journal={journal of the audio engineering society},
title={high-order analog control of a clocked class-d audio amplifier with global feedback using z-domain methods},
year={2011},
number={8468},
month={october},}