OP-AMP based interface circuit for resistive sensor with lead-wire-resistance compensation

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dc.contributor.authorKaewpoonsuk, Anucha
dc.contributor.authorKatman, Ratchanoo
dc.contributor.authorRerkratn, Apinai
dc.date.accessioned2026-08-06T10:24:21Z
dc.date.available2026-08-06T10:24:21Z
dc.date.issued2019-04-01
dc.description.abstractThis paper presents a simple technique to implement the resistive sensor interface for remote measuring. The circuit is designed using a relaxation oscillator to generate a square wave signal. The time difference during charging and discharging a capacitor is directly proportional to the sensor’s resistance. The structure of the circuit is composed of two op-amps, three bipolar junction transistors, a capacitor, four fixed resistors and a variable resistor. Features of the proposed circuit are single-supply operation and direct interface with a microcontroller without an analog-to-digital converter. In addition, the lead-wire resistance is automatically compensated. When the resistance values of the sensor are varied in the range of 500-1500 O with lead-wire resistance values of 0-100 ω, the result of the circuit testing is found that the maximum error is approximately equal to 1.15% of full scale. The performance of the circuit is in accordance with principles proposed.
dc.identifier.citationIcic Express Letters, 13(4), 311-316, 2019
dc.identifier.doi10.24507/icicel.13.04.311
dc.identifier.issn1881803X
dc.identifier.other2-s2.0-85064821333
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/9800
dc.sourceIcic Express Letters
dc.subjectInterface circuit
dc.subjectOp-amp
dc.subjectRemote measurement
dc.subjectResistive sensors
dc.titleOP-AMP based interface circuit for resistive sensor with lead-wire-resistance compensation
dc.typeArticle

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