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A fully-digital and ultra-low-power front-end for differential capacitive sensors

Patcharee Kongpark 1 Souha Hacine 1 Laurent Latorre 1 Frédérick Mailly 1 Pascal Nouet 1
1 SmartIES - Smart Integrated Electronic Systems
LIRMM - Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier
Abstract : In this paper, we present a simple, compact and low-power interface for differential capacitive sensors with a direct digital output. The complete system is composed with a current to voltage converter, an integrator, a comparator and a one-bit digital to analog converter as a feedback. The so-obtained Sigma―Delta modulator is able to deliver directly a bit stream with a ratio of logical `1' directly proportional to the differential capacitance to be measured. A partially integrated prototype has been realized to demonstrate accuracy and non-linearity compatible with a 9-bit sensor.
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Submitted on : Wednesday, February 10, 2016 - 5:41:07 PM
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Patcharee Kongpark, Souha Hacine, Laurent Latorre, Frédérick Mailly, Pascal Nouet. A fully-digital and ultra-low-power front-end for differential capacitive sensors. Microsystem Technologies, Springer Verlag, 2017, 23 (9), pp.3991-4000. ⟨10.1007/s00542-015-2777-z⟩. ⟨lirmm-01272416⟩



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