ISFET-based sensor signal processor chip design for environment monitoring applications

Wen-Yaw Chung; Chung-Huang Yang; Ming-Ga Wang

doi:10.1117/12.572324

7 December 2004 ISFET-based sensor signal processor chip design for environment monitoring applications

Wen-Yaw Chung, Chung-Huang Yang, Ming-Ga Wang

Proceedings Volume 5586, Advanced Environmental, Chemical, and Biological Sensing Technologies II; (2004) https://doi.org/10.1117/12.572324
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

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.

Citation Download Citation

Wen-Yaw Chung, Chung-Huang Yang, and Ming-Ga Wang "ISFET-based sensor signal processor chip design for environment monitoring applications", Proc. SPIE 5586, Advanced Environmental, Chemical, and Biological Sensing Technologies II, (7 December 2004); https://doi.org/10.1117/12.572324

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