NDLI: Digital interface circuits using sigma-delta modulation for integrated micro-fluxgate magnetic sensors

Content Provider	IEEE Xplore Digital Library
Author	Kawahito, S. Yamasawa, A. Koga, S. Tadokoro, Y. Mizuno, K. Tabata, O.
Copyright Year	1996
Description	Author affiliation: Toyohashi Univ. of Technol., Japan (Kawahito, S.)
Abstract	This paper presents a high-resolution micro fluxgate magnetic sensor interface circuit based on 2nd-order sigma-delta modulation. The fluxgate sensing element is placed in the modulation loop. This technique allows us to realize pulse negative feedback in the magnetic flux domain, and the instability due to the use of a ferromagnetic core can be reduced. As one of the integrators, a continuous-time integrator is used, and that is also used for the multi-aliasing filter for phase sensitive detector output. The oversampling A/D conversion using 2nd-order sigma-delta modulation results in the high-precision detection of extremely weak magnetic field in the order of sub-nanotesla. The interface circuit chip is designed and evaluated by circuit simulation and behavior-level simulation.
Starting Page	340
Ending Page	343
File Size	436113
Page Count	4
File Format	PDF
ISBN	0780330730
DOI	10.1109/ISCAS.1996.541971
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-05-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delta-sigma modulation Circuit simulation Magnetic sensors Magnetic circuits Negative feedback Negative feedback loops Magnetic flux Magnetic cores Magnetic separation Filters
Content Type	Text
Resource Type	Article

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