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An ultra-low-power front-end for differential capacitive sensors

Patcharee Kongpark 1 Frédérick Mailly 1 Laurent Latorre 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 direct digital output. The complete system is composed with a current to voltage amplifier, an integrator, a comparator and a feedback capacitor connected in parallel with one of the two capacitances. Overall a Sigma-Delta modulator is obtained that is able to deliver directly a bit stream proportional to the differential capacitance.
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Contributor : Frédérick Mailly <>
Submitted on : Monday, November 30, 2015 - 11:30:51 AM
Last modification on : Wednesday, July 24, 2019 - 4:49:11 PM



Patcharee Kongpark, Frédérick Mailly, Laurent Latorre, Pascal Nouet. An ultra-low-power front-end for differential capacitive sensors. DTIP: Design, Test, Integration and Packaging, Apr 2015, Montpellier, France. ⟨10.1109/DTIP.2015.7160964⟩. ⟨lirmm-01235453⟩



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