Digital-to-analog converter with noiseshaping modulator, commuta

Details Digital-to-analog converter with noiseshaping modulator, commuta Digital-to-analog converter with noiseshaping modulator, commuta

1998-01-02

2000-02-22

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341141, H03M 300

Patent

active

060285443

ABSTRACT:
A digital-to-analog converter (200) has a first portion (208) which receives a digital input signal X (201') and has serially coupled a second portion (209) which provides an analog output signal Y (202'). The first portion (208) is a delta-sigma modulator with integrators (210 and 215), adders (203 and 205), a comparator (220) and delay stages (230 and 235). The second portion (209) comprises a commutator (260), unit converters (280-n) and an analog adder (290). In the second portion, the unit converters (280-n) can be mismatched. The first portion (208) provides a noise-shaped intermediate signal V (221') which has substantially zero noise at that frequencies where the mismatches would lead to unwanted spectral tones.

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Richard L. Carley, Richard Schreier, and Gabor C. Temes: "Delta-Sigma ADCs with Multibit Internal converters", published in 1997 as Chapter 8 (pp. 244-264) of the following book: Nortsworthy, Steven R.; Schreier R.; Temes G. C. (editors): "Delta-Sigma Data Converters: theory, design, and simulation", IEEE Press, Piscataway 1997, ISBN, 0-7803-1045-4).
Gabor C. Temes, Shaofeng Shu, and Richard Schreier: "Architectures for .DELTA..SIGMA. DACs" published in 1997 as chapter 10 (pp. 309-332) of the following book: Nortsworthy, Steven R.; Schreier R.; Temes G. C. (editors): "Delta-Sigma Data Converters: theory, design, and simulation", IEEE Press, Piscataway 1997, ISBN 0-7803-1045-4).
Mike Rebeschini and Paul F. Ferguson, Jr.: "Analog-Circuit Design for Delta-Sigma DACs" published in 1997 as chapter 12 (pp. 380-405) of the following book: Nortsworthy, Steven R.; Schreier R.; Temes G. C. (editors): "Delta-Sigma Data Converters: theory, design, and simulation", IEEE Press, Piscataway 1997, ISBN 0-7803-1045-4).
Proakis, J. G., Manolakis, D. G.: "Digital Signal Processing", Prentice Hall Upper Saddle River, New Jersey, 1996, ISBN 0-13-373762-4. chapter 3, pp. 151-229.

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