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The noise performance of a high-speed capacitive-sensor interface based on a relaxation oscillator and a fast counter

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Gasulla Forner, ManuelMés informacióMés informacióMés informació
Li, Xiujun
Meijer, Gerard C. M.
Document typeArticle
Defense date2005-10
PublisherInstitute of Electrical and Electronics Engineers
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
This paper presents the analysis and experimental results on the noise performances of a capacitive-sensor interface. The interface is able to measure low capacitance values in the order of picofarads and is implemented with a simple relaxation oscillator, a fast counter, and a microcontroller. The goal is to find the criteria to implement a low-noise system, so that, even with a short measuring time, low noise can be obtained. Experimental results are performed in order to prove the validity of the theoretical analysis. The achieved resolution, with a measuring time of 20 ms, was better than 14.2 /spl times/ 10/sup -7/ for the measurement of a capacitance value of 2.2 pF.
CitationGasulla Forner, M.; Li, Xiujun; Meijer, Gerard C. M. The noise performance of a high-speed capacitive-sensor interface based on a relaxation oscillator and a fast counter. IEEE Transactions On Instrumentation and Measurement, 2005, Vol. 54, No. 5, 1934-1940 
URIhttp://hdl.handle.net/2117/1265
ISSN0018-9456
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  • GRUP ISI - Grup d'Instrumentació, sensors i interfícies - Articles de recerca [69]
  • Departament d'Enginyeria Electrònica - Articles de revista [1.588]
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