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Open AccessArticle

Temperature Compensation Circuit for ISFET Sensor

1
National Engineering School of Monastir (ENIM), University of Monastir, Monastir 5000, Tunisia
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Electronics and Microelectronics Laboratory, LR99ES30, Faculty of Sciences of Monastir, University of Monastir, Monastir 5000, Tunisia
3
Higher Institute of Applied Sciences and Technology of Sousse (ISSATSo), University of Sousse, Sousse 4003, Tunisia
4
Nanomaterials, Microsystems for Health, Environment and Energy Laboratory, LR16CRMN01, Centre for Research on Microelectronics and Nanotechnology, Sousse 4034, Tunisia
*
Author to whom correspondence should be addressed.
J. Low Power Electron. Appl. 2020, 10(1), 2; https://doi.org/10.3390/jlpea10010002
Received: 3 November 2019 / Revised: 20 December 2019 / Accepted: 21 December 2019 / Published: 4 January 2020
PH measurements are widely used in agriculture, biomedical engineering, the food industry, environmental studies, etc. Several healthcare and biomedical research studies have reported that all aqueous samples have their pH tested at some point in their lifecycle for evaluation of the diagnosis of diseases or susceptibility, wound healing, cellular internalization, etc. The ion-sensitive field effect transistor (ISFET) is capable of pH measurements. Such use of the ISFET has become popular, as it allows sensing, preprocessing, and computational circuitry to be encapsulated on a single chip, enabling miniaturization and portability. However, the extracted data from the sensor have been affected by the variation of the temperature. This paper presents a new integrated circuit that can enhance the immunity of ion-sensitive field effect transistors (ISFET) against the temperature. To achieve this purpose, the considered ISFET macro model is analyzed and validated with experimental data. Moreover, we investigate the temperature dependency on the voltage-current (I-V). Accordingly, an improved conditioning circuit is designed in order to reduce the temperature sensitivity on the measured pH values of the ISFET sensor. The numerical validation results show that the developed solution accurately compensates the temperature variation on the measured pH values at low power consumption. View Full-Text
Keywords: ISFET sensor; conditioning circuit; temperature compensation; overall sensitivity ISFET sensor; conditioning circuit; temperature compensation; overall sensitivity
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MDPI and ACS Style

Gaddour, A.; Dghais, W.; Hamdi, B.; Ben Ali, M. Temperature Compensation Circuit for ISFET Sensor. J. Low Power Electron. Appl. 2020, 10, 2.

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