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Simple and Low-Cost Readout Circuit for Differential Resistive Sensors

Ratchanoo Katman(1), Apinai Rerkratn(2), Anucha Kaewpoonsuk(3*)

(1) Department of Physics, Research Center for Academic Excellent in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok, Thailand
(2) Department of Instrumentation and Control Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang,, Bangkok, Thailand
(3) Department of Physics, Research Center for Academic Excellent in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok, Thailand
(*) Corresponding author


DOI: https://doi.org/10.15866/iree.v13i5.14995

Abstract


In this paper, a simple and low-cost readout circuit for differential resistive sensors is presented. The realization method is based on the relaxation oscillation technique, which utilizes the operational amplifiers (op-amps) with a single supply voltage. The oscillating output Duty-Cycle is proportional to the difference of two sensing resistances. In comparison with the traditional voltage divider circuit or the Wheatstone bridge circuit or the previously reported readout circuit based on CCIIs, the proposed circuit can be interfaced with microcontroller without using an analog-to-digital converter. Theoretical predictions are supported by the PSPICE simulation results and the experimental data. In applying a slide potentiometer with changes of slider positions of ±15 mm, it is found that the maximum error of the proposed circuit is approximately -2.90% of full-scale
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Keywords


Readout Circuit; Interface Circuit; Resistive Sensors; CCII

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References


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