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

M Gasulla; X Li; GCM Meijer

doi:doi:10.1109/TIM.2005.853684

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

M Gasulla, X Li, GCM Meijer

Electronic Instrumentation

Research output: Contribution to journal › Article › Scientific › peer-review

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.

Original language	Undefined/Unknown
Pages (from-to)	1934-1940
Number of pages	7
Journal	IEEE Instrumentation and Measurement Magazine
Volume	54
Issue number	5
DOIs	https://doi.org/doi:10.1109/TIM.2005.853684
Publication status	Published - 2005

Keywords

academic journal papers
ZX CWTS JFIS < 1.00

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doi:10.1109/TIM.2005.853684

Cite this

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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.",

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AU - Li, X

AU - Meijer, GCM

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N2 - 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.

AB - 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.

KW - academic journal papers

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