An overview of sigma-delta converters

Using sigma-delta A/D methods, high resolution can be obtained for only low to medium signal bandwidths. This article describes conventional A/D conversion, as well as its performance modeling. We then look at the technique of oversampling, which can be used to improve the resolution of classical A/...

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Published in:IEEE signal processing magazine 1996-01, Vol.13 (1), p.61-84
Main Authors: Aziz, P.M., Sorensen, H.V., vn der Spiegel, J.
Format: Magazinearticle
Language:English
Subjects:
Analog-digital conversion
Bandwidth
Delta-sigma modulation
Digital signal processing
Filters
Optical signal processing
Sampling methods
Signal processing
Signal resolution
Signal sampling
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description Using sigma-delta A/D methods, high resolution can be obtained for only low to medium signal bandwidths. This article describes conventional A/D conversion, as well as its performance modeling. We then look at the technique of oversampling, which can be used to improve the resolution of classical A/D methods. We discuss how sigma-delta converters use the technique of noise shaping in addition to oversampling to allow high resolution conversion of relatively low bandwidth signals. We examine the use of sigma-delta converters to convert narrowband bandpass signals with high resolution. Several parallel sigma-delta converters, which offer the potential of extending high resolution conversion to signals with higher bandwidths, are also described.
doi_str_mv 10.1109/79.482138
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subjects Analog-digital conversion
Bandwidth
Delta-sigma modulation
Digital signal processing
Filters
Optical signal processing
Sampling methods
Signal processing
Signal resolution
Signal sampling
title An overview of sigma-delta converters
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