NDLI: A switched current sigma delta modulator using a low distortion feedfoward topology

Content Provider	IEEE Xplore Digital Library
Author	Prior, C.A. Rodrigues, C.R.
Copyright Year	2010
Description	Author affiliation: Microeletronics Group - Gmicro, Federal University of Santa Maria, - RS, Brazil (Prior, C.A.; Rodrigues, C.R.)
Abstract	Implementation of feedforward paths for low-distortion topologies on switched capacitor sigma-delta (SC-SD) modulators was successfully reported elsewhere [13]. In this paper we propose the use of a similar low distortion topology on an implementation of a switched current sigma-delta (SI-SD) modulator. The objective is a reduction of harmonic distortion observed in implementations with simple integrator cells. In this approach, one of the main SI cell drawbacks, the harmonic distortion due to conductance variation, can be reduced by alleviating the signal in the integrators path. In this approach, the integrators ideally process only noise. Relaxing requirements of integrators allows simpler and faster switched-current integrator circuits. The feedforward SI-SD modulator was designed in XFAB CMOS 0.6µm technology. Simulated results points to a reduction of harmonic distortion from 2% in a classical 2nd order feedback topology to 0.2% in the feed forward design. It also provides a reduction of 30% in the silicon area, and higher sampling frequency.
Starting Page	296
Ending Page	299
File Size	1503054
Page Count	4
File Format	PDF
ISBN	9781424477715
ISSN	15483746
e-ISBN	9781424477739
DOI	10.1109/MWSCAS.2010.5548808
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-08-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delta-sigma modulation Delta modulation Topology Harmonic distortion CMOS technology Capacitors Circuit noise Switching circuits Circuit simulation Feedback
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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