Grounded Capacitive Sensor Readout Using Improved Guard Driving Circuit

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dc.contributor.authorChimnoy, Jirat
dc.contributor.authorKarawanich, Khunanon
dc.contributor.authorPrommee, Pipat
dc.date.accessioned2026-08-06T10:49:12Z
dc.date.available2026-08-06T10:49:12Z
dc.date.issued2025-01-01
dc.description.abstractA remote capacitive sensor is necessary in hazardous locations such as liquid boilers and chemical facilities. The connection of the capacitive sensor and coaxial cable is integrated with the readout circuit, encompassing intrinsic noise and parasitic capacitance limitations. This work presents a grounded capacitive sensor with an economical architecture incorporating an RC lowpass filter and an enhanced guard driving circuit. The proposed technique effectively achieves minimal parasitic capacitance and reduced noise at the output. The sensor capacitance can be readily calculated by measuring the output signal's amplitude at the cutoff frequency. Both simulation and experimental findings corroborate its efficacy and precision. The capacitance range can be quantified between 1-100 pF with less than 2% relative errors.
dc.identifier.citation2025 International Technical Conference on Circuits Systems Computers and Communications Itc Cscc 2025, 2025
dc.identifier.doi10.1109/ITC-CSCC66376.2025.11137736
dc.identifier.other2-s2.0-105016364092
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/16447
dc.source2025 International Technical Conference on Circuits Systems Computers and Communications Itc Cscc 2025
dc.subjectcapacitive sensor
dc.subjectgainbandwidth
dc.subjectguard driving
dc.subjectlow-cost
dc.subjectlowpass filter
dc.subjectOPAMP
dc.titleGrounded Capacitive Sensor Readout Using Improved Guard Driving Circuit
dc.typeConference Paper

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