Al-Janabi, M., Kale, I. and Morling, R.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 0852967187Full text not available from this repository.
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|
|Subjects:||University of Westminster > Science and Technology|
|Date Deposited:||02 Feb 2012 16:09|
|Last Modified:||30 Jun 2016 11:33|
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