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Proceedings 2017, 1(4), 592;

Linear Integrated Interface for Automatic Differential Capacitive Sensing

Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy
Deparment of Information Engineering, University of Brescia, 25123 Brescia, Italy
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
Author to whom correspondence should be addressed.
Published: 29 August 2017
(This article belongs to the Proceedings of Eurosensors 2017)
PDF [1064 KB, uploaded 29 August 2017]


In this work, the authors introduce a new full-analog front-end for differential capacitance sensors which provides a DC output voltage, directly proportional to the measurand variations. The readout circuit architecture is based on a De Sauty bridge as core of the capacitive sensing whereas the feedback circuitry performs the bridge autobalancing operation by means of changes in a multiplier output. The circuit is designed in a standard CMOS technology (AMS 0.35 µm) so is suitable for portable systems. Simulated results have shown a good agreement with the theoretical model being the percentage relative error less than 2.5%. Interface sensitivity is constant and values around 0.055 V/mm for the considered application.
Keywords: differential capacitance sensors; bridge-based circuits; CMOS technology; sensor interfaces differential capacitance sensors; bridge-based circuits; CMOS technology; sensor interfaces
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Barile, G.; Ferri, G.; Parente, F.R.; Stornelli, V.; Depari, A.; Flammini, A.; Sisinni, E. Linear Integrated Interface for Automatic Differential Capacitive Sensing. Proceedings 2017, 1, 592.

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