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Journal Article

Theory and Practical Implementation of a Fifth-Order Sigma-Delta A/D Converter

Authors: Adams, Robert W.; Ferguson, Jr., Paul F.; Ganesan, Apparajan; Vincelette, Scott; Volpe, Anthony; Libert, Robert

Journal of the Audio Engineering Society · Volume 39 · Issue 7/8 · pp. 515–528 · July 1991

Abstract

One-bit noise-shpaing converters with high-order loop filters have long been considered difficult or impossibleto stabilize. A new approach is discussed which simplifies the analysis of high-order loops, and several topologies that can be used for the implementation of such loops are presented. An 18-bit analog-to-digital converter integrated circuit has been designed using this approach, which uses a fifth-order loop filter with an unusual loop topology. Implementation of the loop using differential switched-capacitor techniques is described. A one-step decimation filter with 115-dB stopband attenuation is used to remove out-of-band quantization noise. Preliminary measurements indicate a dynamic range of 105 dB, a number that is compatible with the requirements of professional digital audio.

Details

Publication
Journal of the Audio Engineering Society
Volume
39
Issue
7/8
Pages
515–528
Publication date
July 6, 1991
Affiliation
Analog Devices Semiconductor, Wilmington, MA (See document for exact affiliation information.)
Type
Journal Article