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To use one-bit Sigma-Delta Modulation (SDM) in digital class-D power amplifiers the effective pulse frequency has to be reduced. This paper contains a review about this problem. It will be shown, how the efficiency of the amplifier is degraded by too high pulse frequencies. Fundamental approaches to create high resolution pulse signals with lower pulse rates around 300 to 500 kHz will be shown. One of these is a controlled generation of the pulse-pattern, like it is done in the "Bit-Flipping". Alternative approaches can be found, when the dependency of the generated pulse patterns by the loop filter structure is considered.
Author (s): Esslinger, Rolf;
Gruhler, Gerhard;
Stewart, Robert W.;
Affiliation:
University of Applied Sciences, Dept. of Microengineering, Germany ; Signal Processing Division, Dept. of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, Scotland (UK)
(See document for exact affiliation information.)
AES Convention: 112
Paper Number:5634
Publication Date:
2002-04-06
Session subject:
Signal Processing Forum
DOI:
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Esslinger, Rolf; Gruhler, Gerhard; Stewart, Robert W.; 2002; Sigma-Delta Modulation in Digital Class-D Power Amplifiers: Methods for Reducing the Effective Pulse Transition Rate [PDF]; University of Applied Sciences, Dept. of Microengineering, Germany ; Signal Processing Division, Dept. of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, Scotland (UK); Paper 5634; Available from: https://aes.org/publications/elibrary-page/?id=11370
Esslinger, Rolf; Gruhler, Gerhard; Stewart, Robert W.; Sigma-Delta Modulation in Digital Class-D Power Amplifiers: Methods for Reducing the Effective Pulse Transition Rate [PDF]; University of Applied Sciences, Dept. of Microengineering, Germany ; Signal Processing Division, Dept. of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, Scotland (UK); Paper 5634; 2002 Available: https://aes.org/publications/elibrary-page/?id=11370
@inproceedings{Esslinger2002sigma-delta,
title={{Sigma-Delta Modulation in Digital Class-D Power Amplifiers: Methods for Reducing the Effective Pulse Transition Rate}},
author={Esslinger, Rolf and Gruhler, Gerhard and Stewart, Robert W.},
year={2002},
month={apr},
booktitle={Journal of the Audio Engineering Society},
publisher={Paper 5634; AES Convention 112; April 2002},
number={5634},
organization={AES},
}
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