All-Grounded Passive Component Mixed-Mode Multifunction Biquadratic Filter and Dual-Mode Quadrature Oscillator Employing a Single Active Element

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dc.contributor.authorRoongmuanpha, Natchanai
dc.contributor.authorTangjit, Jetwara
dc.contributor.authorFaseehuddin, Mohammad
dc.contributor.authorTangsrirat, Worapong
dc.contributor.authorPukkalanun, Tattaya
dc.date.accessioned2026-08-06T10:52:04Z
dc.date.available2026-08-06T10:52:04Z
dc.date.issued2025-09-01
dc.description.abstractThis paper introduces a compact analog configuration that concurrently realizes a mixed-mode biquadratic filter and a dual-mode quadrature oscillator (QO) by employing a single differential differencing gain amplifier (DDGA) and all-grounded passive components. The proposed design supports four fundamental operation modes—voltage-mode (VM), current-mode (CM), trans-impedance-mode (TIM), and trans-admittance-mode (TAM)—utilizing the same circuit topology without structural modifications. In filter operation, it offers low-pass, high-pass, band-pass, band-stop, and all-pass responses with orthogonal and electronic pole frequency and quality factor. In oscillator operation, it delivers simultaneous voltage and current quadrature outputs with independent tuning of oscillator frequency and condition. The grounded-component configuration simplifies layout and enhances its suitability for monolithic integration. Numerical simulations in a 0.18-μm CMOS process with ±0.9 V supply confirm theoretical predictions, demonstrating precise gain-phase characteristics, low total harmonic distortion (<7%), modest sensitivity to 5% component variations, and stable operation from −40 °C to 120 °C. These results, combined with the circuit’s low component count and integration suitability, suggest strong potential for future development in low-power IoT devices, adaptive communication front-ends, and integrated biomedical systems.
dc.identifier.citationTechnologies, 13(9), 2025
dc.identifier.doi10.3390/technologies13090393
dc.identifier.issn22277080
dc.identifier.other2-s2.0-105017008058
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/17220
dc.sourceTechnologies
dc.subjectbiquadratic filter
dc.subjectdifferential differencing gain amplifier (DDGA)
dc.subjectdual-mode operation
dc.subjectmixed-mode operation
dc.subjectquadrature oscillator (QO)
dc.titleAll-Grounded Passive Component Mixed-Mode Multifunction Biquadratic Filter and Dual-Mode Quadrature Oscillator Employing a Single Active Element
dc.typeArticle

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