Synthesis of electronically tunable multifunction biquad filter using voltage differencing differential input buffered amplifiers

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dc.contributor.authorBunrueangsak, Sirigul
dc.contributor.authorJaikla, Winai
dc.contributor.authorChaichana, Amornchai
dc.contributor.authorSupavarasuwat, Piya
dc.contributor.authorSiripongdee, Surapong
dc.contributor.authorSuwanjan, Peerawut
dc.date.accessioned2026-08-06T10:50:23Z
dc.date.available2026-08-06T10:50:23Z
dc.date.issued2025-02-01
dc.description.abstractBiquad filters are commonly used in analog circuits for various purposes in signal processing and communication applications. We synthesize an analog active biquad filter with five types of voltage-mode filtering functions. The filter is synthesized using a parallel passive resistor-inductor-capacitor (RLC) network and unity-gain voltage differencing amplifier. A voltage differencing differential input buffered amplifier (VD-DIBA) is the main active component, and the biquad filter has a three-input single-output (TISO) topology. By replacing the passive inductor and resistor with VD-DIBA-based inductance and resistance simulators with a subtractor, the TISO voltage-mode versatile filter is obtained from two VD-DIBAs, one resistor, and two capacitors connected to the ground. The proposed filter can provide five types of voltage-mode filtering functions: inverting bandpass and lowpass responses as well as noninverting band-stop, high-pass, and all-pass responses. The all-pass filter requires no additional active components. The three input voltage nodes have high impedance, and a low-impedance output voltage node facilitates cascade connections without using additional voltage buffers. In addition, the natural frequency and quality factor can be electronically tuned. The quality factor is controlled without disturbing the passband gain and natural frequency. The proposed filter is simulated and verified experimentally in the Personal Simulation Program with Integrated Circuit Emphasis (PSPICE) and through laboratory tests employing VD-DIBAs implemented using commercially available components.
dc.identifier.citationETRI Journal, 47(1), 144-157, 2025
dc.identifier.doi10.4218/etrij.2023-0391
dc.identifier.issn12256463
dc.identifier.other2-s2.0-85218963672
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/16771
dc.sourceETRI Journal
dc.subjectanalog filter
dc.subjectelectronic controllability
dc.subjectmultiple-input single-output configuration
dc.subjectVD-DIBA
dc.titleSynthesis of electronically tunable multifunction biquad filter using voltage differencing differential input buffered amplifiers
dc.typeArticle

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