NDLI: An analytical technique for counteracting drift in ion-selective field effect transistors (ISFETs)

Content Provider	IEEE Xplore Digital Library
Author	Jamasb, S.
Copyright Year	2001
Abstract	The instability of the dc operating point in pH-sensitive ion-selective field effect transistors (ISFETs) renders the continuous monitoring of physiological pH using these devices inaccurate. This instability, commonly known as drift, manifests itself as a relatively slow, monotonic change in the measuring output signal in the absence of variations in the pH. In this work, a method for correction of ISFET drift is presented. This method takes advantage of the relatively small instantaneous drift rate in ISFETs to compensate for the drift signal superimposed on the sensor output. The validity of this method is experimentally confirmed by continuous monitoring of pH under in vitro conditions approximating metabolic acidosis using a Si/sub 3/N/sub 4/-gate pH-sensitive ISFET.
Sponsorship	IEEE Sensors Council
Starting Page	795
Ending Page	801
Page Count	7
File Size	255589
File Format	PDF
ISSN	1530437X
Volume Number	4
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	FETs In vitro In vivo Packaging Insulation Blood Stability PROM Biomedical monitoring Condition monitoring pH Continuous monitoring drift instability ion-selective field effect transistor (ISFET)
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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