Journal
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
Volume 45, Issue 12, Pages 2149-2156Publisher
WILEY
DOI: 10.1002/cta.2298
Keywords
differential capacitance sensors; bridge-based circuits; uncalibrated analog circuit; Wheatstone bridge
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In this paper, an integrable novel fully analog Wheatstone bridge-based interface for differential capacitance estimation is presented. Its working principle takes advantage of the modified De-Sauty AC bridge configuration being employed only by two capacitors and two resistors. A feedback loop controls one of the resistors (e.g. a voltage-controlled resistor), to obtain an evaluation of the differential capacitance variation on a full range, thanks to a general but very simple formula that considers both the auto-balancing' and the bridge out-of-equilibrium' ranges. The proposed interface shows a satisfactory accuracy, being the percentage relative error within 0.45% for the experimental results. Copyright (c) 2016 John Wiley & Sons, Ltd.
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