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An overview of sigma-delta converters

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3 Author(s)
P. M. Aziz ; AT&T Bell Labs., Murray Hill, NJ, USA ; H. V. Sorensen ; J. vn der Spiegel

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

Published in:

IEEE Signal Processing Magazine  (Volume:13 ,  Issue: 1 )