NDLI: An Unconstrained Architecture for Systematic Design of Higher Order <formula formulatype=inline><tex>$SigmaDelta$</tex></formula> Force-Feedback Loops

Content Provider	IEEE Xplore Digital Library
Author	Raman, J. Rombouts, P. Weyten, L.
Copyright Year	2004
Abstract	Nowadays, SigmaDelta-modulation is a widely used technique for analog-to-digital (A/D) conversion, especially when aiming for high resolutions. While being applied initially for purely electrical A/D converters, its application has been expanded to mixed mechanical-electrical systems. This has led to the use of SigmaDelta force-feedback for digital readout of high-performance inertial sensors. However, compared with their electrical counterpoint, SigmaDelta force-feedback loops often have to deal with three additional issues: 1) an increased stability problem due to phase-lag occurring in the sensor; 2) the injection of relatively high levels of readout noise in the loop; and 3) the lack of degrees-of-freedom of many SigmaDelta force-feedback architectures for implementing an arbitrary noise transfer function. As a result, SigmaDelta force-feedback loops found in literature are designed in a much less systematic way as compared with electrical SigmaDelta modulators. In this paper, we address these issues and propose a new unconstrained architecture. Based on this architecture, we are able to present a systematic approach for designing SigmaDelta force-feedback loops. Additionally, the main strengths and weaknesses of different SigmaDelta force-feedback architectures are discussed.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	1601
Ending Page	1614
Page Count	14
File Size	1344517
File Format	PDF
ISSN	15498328
Volume Number	55
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delta-sigma modulation Sensor systems Micromechanical devices Mechanical sensors Stability Noise level Phase noise Feedback circuits Bandwidth CMOS technology systematic design A/D-conversion force-feedback MEMS inertial sensors sigma-delta $(\Sigma\Delta)$ modulation Sigma-Delta modulation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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