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Proceedings Paper

ISFET-based sensor signal processor chip design for environment monitoring applications
Author(s): Wen-Yaw Chung; Chung-Huang Yang; Ming-Ga Wang
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Paper Abstract

In recent years Ion-Sensitive Field Effect Transistor (ISFET) based transducers create valuable applications in physiological data acquisition and environment monitoring. This paper presents a mixed-mode ASIC design for potentiometric ISFET-based bio-chemical sensor applications including H+ sensing and hand-held pH meter. For battery power consideration, the proposed system consists of low voltage (3V) analog front-end readout circuits and digital processor has been developed and fabricated in a 0.5mm double-poly double-metal CMOS technology. To assure that the correct pH value can be measured, the two-point calibration circuitry based on the response of standard pH4 and pH7 buffer solution has been implemented by using algorithmic state machine hardware algorithms. The measurement accuracy of the chip is 10 bits and the measured range between pH 2 to pH 12 compared to ideal values is within the accuracy of 0.1pH. For homeland environmental applications, the system provide rapid, easy to use, and cost-effective on-site testing on the quality of water, such as drinking water, ground water and river water. The processor has a potential usage in battery-operated and portable devices in environmental monitoring applications compared to commercial hand-held pH meter.

Paper Details

Date Published: 7 December 2004
PDF: 8 pages
Proc. SPIE 5586, Advanced Environmental, Chemical, and Biological Sensing Technologies II, (7 December 2004); doi: 10.1117/12.572324
Show Author Affiliations
Wen-Yaw Chung, Chung-Yuan Christian Univ. (Taiwan)
Chung-Huang Yang, Chung-Yuan Christian Univ. (Taiwan)
Van Nung Institute of Technology (Taiwan)
Ming-Ga Wang, Chung-Yuan Christian Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5586:
Advanced Environmental, Chemical, and Biological Sensing Technologies II
Tuan Vo-Dinh; Gunter Gauglitz; Robert A. Lieberman, Editor(s)

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