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Decimation schemes for ΣΔ A/D converters based on Kaiser and Hamming sharpened filters

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2 Author(s)
Laddomada, M. ; Dipt. di Elettronica, Torino, Italy ; Mondin, M.

Cascaded-integrator-comb (CIC) filters are efficient anti-aliasing rate-conversion filters widely used for ΣΔ A/D converters. High-order structures, attempting to increase the noise rejection within the folding bands, have the drawback of inserting multiple zeros in the same positions and increasing the edge-band attenuation. A combination of sharpened and CIC filters is proposed in the paper, with the goal of increasing the rejection of the ΣΔ quantisation noise around the folding bands and reducing the pass-band drop of the designed decimation filters with respect to classic CIC structures. Design criteria, leading to optimised structures, and comparisons are given with respect to both classical and modified CIC filters.

Published in:

Vision, Image and Signal Processing, IEE Proceedings -  (Volume:151 ,  Issue: 4 )

Date of Publication:

30 Aug. 2004

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