Efficient modified-sine filters for sigma-delta A/D converters

Authors
Citation
L. Lo Presti, Efficient modified-sine filters for sigma-delta A/D converters, IEEE CIR-II, 47(11), 2000, pp. 1204-1213
Citations number
14
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING
ISSN journal
10577130 → ACNP
Volume
47
Issue
11
Year of publication
2000
Pages
1204 - 1213
Database
ISI
SICI code
1057-7130(200011)47:11<1204:EMFFSA>2.0.ZU;2-S
Abstract
In this paper, a method to design and implement a very efficient multistage decimation filter for a sigma-delta (Sigma Delta) A/D converter is propose d. The scheme is composed by two stages, but the proposed method can be eas ily extended to a multiple-stage implementation, The first-stage filter is obtained by properly rotating the zero-pole distribution of a comb filter i n the z-plane, The obtained structure exhibits linear phase and can be impl emented by using a recursive structure with only two multipliers, The desig n phase is easy and very flexible. As most of the quantization noise is eli minated at the first stage, the second-stage filter can be designed with re laxed specifications. Any classical design algorithm can be used for it. An alternative scheme for the second stage can be obtained by splitting the s tage into two substages, and the method proposed in this paper can be itera ted. The system performances are evaluated by simulation.