NDLI: Compensation of Mechanical Stress-Induced Drift of Bandgap References With On-Chip Stress Sensor

Content Provider	IEEE Xplore Digital Library
Author	Motz, M. Ausserlechner, U. Holliber, M.
Copyright Year	2001
Abstract	Today's smart sensor systems rely heavily on bandgap circuit techniques to achieve the required high accuracy. However, all presently known bandgap references show a notable lifetime drift of ~1 mV caused by instable mechanical stress in common plastic encapsulated packages. This paper proposes a versatile digital stress compensation scheme which works for arbitrary packages and silicon technologies. It uses a new mechanical stress sensor to measure the sum of in-plane normal stress components. The mechanical stress drifts of bandgap reference, stress, and temperature sensors were characterized on wafer stripes in a four-point bending fixture. With these results a compensation algorithm was derived. Mechanical stress drifts were provoked by thermal cycling measurements on samples in a quad flat no leads-like plastic encapsulated package after moisture soaking. These measurements show that the mechanical stress related drift of a Brokaw bandgap voltage can be reduced by about one order in magnitude over the whole automotive temperature range. Due to the low process spread of the proposed stress sensor only a single-trim at room temperature on wafer level is necessary.
Sponsorship	IEEE Sensors Council
Starting Page	5115
Ending Page	5121
Page Count	7
File Size	1861020
File Format	PDF
ISSN	1530437X
Volume Number	15
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stress Photonic band gap Temperature sensors Temperature measurement Resistors Mechanical sensors piezo-junction bandgap reference mechanical stress compensation Bandgap
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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