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Direct interface for capacitive sensors based on the charge transfer method

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3 Author(s)
Gaitan-Pitre, J.E. ; Univ. de Pamplona, Pamplona ; Gasulla, M. ; Pallas-Areny, R.

We present the theoretical analysis and experimental performance results of a direct interface for capacitive sensors based on the charge transfer method when parasitic capacitances are included. The interface circuit implements a two-point calibration technique that makes measurement results independent from voltage-and temperature-dependent parameters. The measurement deviation is below 1 % FSR (Full Scale Range) for capacitances from 10 pF to 1 nF.

Published in:

Instrumentation and Measurement Technology Conference Proceedings, 2007. IMTC 2007. IEEE

Date of Conference:

1-3 May 2007