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Increasing the variability of centre frequency locations in multiple-band sigma-delta modulators via the use of fractional delay filters

Al-Janabi, Mohammed and Kale, Izzet and Morling, Richard C.S. (1999) Increasing the variability of centre frequency locations in multiple-band sigma-delta modulators via the use of fractional delay filters. In: Proceedings of the Third International Conference on Advanced A/D and D/A Conversion Techniques and their Applications, University of Strathclyde, Glasgow, UK, July 1999. IEEE, pp. 30-33. ISBN 0852967187

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Official URL: http://dx.doi.org/10.1049/cp:19990456

Abstract

This paper presents the design analysis of novel tunable narrow-band bandpass sigma-delta modulators, that can achieve concurrent multiple noise-shaping for multi-tone input signals. This approach utilises conventional comb filters in conjunction with FIR, or allpass IIR fractional delay filters, to deliver the desired nulls for the quantisation noise transfer function. Detailed simulation results show that FIR fractional delay comb filter based sigma-delta modulators tune accurately to most centre frequencies, but suffer from degraded resolution at frequencies close to Nyquist. However, superior accuracies are obtained from their allpass IIR fractional delay counterpart at the expense of a slight shift in noise-shaping bands at very high frequencies.

Item Type:Book Section
Research Community:University of Westminster > Electronics and Computer Science, School of
ID Code:10290
Deposited On:02 Feb 2012 16:09
Last Modified:02 Feb 2012 16:09

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