Single VDCC-Based Mixed-Mode First-Order Universal Filter and Applications in Bio-Signal Processing Systems

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dc.contributor.authorMoonmuang, Pitchayanin
dc.contributor.authorRoongmuanpha, Natchanai
dc.contributor.authorTangsrirat, Worapong
dc.contributor.authorPukkalanun, Tattaya
dc.date.accessioned2026-08-06T10:54:33Z
dc.date.available2026-08-06T10:54:33Z
dc.date.issued2026-02-01
dc.description.abstractThis paper presents a compact mixed-mode first-order universal filter based on a single voltage differencing current conveyor (VDCC), which can function in all four possible operation modes, i.e., voltage mode (VM), trans-admittance mode (TAM), current mode (CM), and trans-impedance mode (TIM). The proposed configuration requires only two grounded resistors and one floating capacitor, which contributes to a low component count, facilitates integration, and allows for the electronic tunability of the pole frequency through the transconductance gain of the VDCC. This work also demonstrates two practical biomedical applications: an electrocardiogram (ECG) acquisition system utilizing the VM low-pass filter for noise suppression and a bioimpedance (BioZ) measurement system employing the proposed configuration-based CM oscillator circuit as a sinusoidal excitation source. The performance validation confirms the accuracy of impedance extraction and the preservation of waveforms using tissue-equivalent models. The results demonstrate that the proposed VDCC-based filter offers a compact, power-efficient, and versatile analog signal-processing solution suitable for modern biomedical instrumentation.
dc.identifier.citationTechnologies, 14(2), 2026
dc.identifier.doi10.3390/technologies14020101
dc.identifier.issn22277080
dc.identifier.other2-s2.0-105031254336
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/17852
dc.sourceTechnologies
dc.subjectbio-signal processing
dc.subjectdual-mode
dc.subjectfirst-order filter
dc.subjectmixed-mode
dc.subjectvoltage differencing current conveyor (VDCC)
dc.titleSingle VDCC-Based Mixed-Mode First-Order Universal Filter and Applications in Bio-Signal Processing Systems
dc.typeArticle

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