An accurate interface for capacitive sensors

descriptionPublicationkeyboard_double_arrow_right Article 01 Oct 2002 English Publisher:Institute of Electrical and Electronics Engineers (IEEE)Journal:IEEE Transactions on Instrumentation and Measurement, volume 51, pages 935-939 (issn: 0018-9456,

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Authors: Xiujun Li; Gerard C. M. Meijer;

doi: 10.1109/tim.2002.807793

An accurate interface for capacitive sensors

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Abstract

A new smart interface based on a first-order charge-balanced SC-oscillator is presented for capacitive sensors, which are shunted by a parasitic conductance. In the novel interface, the effect of shunting conductance is reduced by using the charge/discharge method. The effect of the stray capacitances is eliminated by using the two-port measurement. Moreover, all multiplicative and additive errors of the interface are also eliminated by using the auto-calibration technique and the chopping technique.

Related Organizations

Delft University of Technology
Netherlands

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