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Author: search.filters.author.Pimpol, JirapunSubject: search.filters.subject.Electronically adjustable

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    Item type:Publication,
    Low-output-impedance electronically adjustable universal filter using voltage differencing buffered amplifiers
    (2019-03-16)
    Pimpol, Jirapun
    ;
    Roongmuanpha, Natchanai
    ;
    Tangsrirat, Worapong
    In this study, a voltage-mode universal filter with three inputs and single output is presented. The circuit is resistor-less, and consists of only two VDBAs and two capacitors. The proposed TISO filter realizes all the five standard biquadratic filter functions at the low-impedance-output terminal without any component matching criterion. The effect of the VDBA non-idealities on the presented filter performance is also discussed in detail. To prove the theoretical finding, simulation results are provided using PSPICE software.
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    Electronically adjustable capacitance multiplier circuit with a single Voltage Differencing Gain Amplifier (VDGA)
    (2019-01-01)
    Tangsrirat, Worapong
    ;
    Channumsin, Orapin
    ;
    Pimpol, Jirapun
    In this work, we propose a resistorless realization of a simple electronically adjustable capacitance multiplier circuit using a single voltage differencing gain amplifier (VDGA) as an active building block. The circuit utilizes one VDGA and only one capacitor in a simple circuit configuration. The proposed capacitance multiplier circuit can be tuned electronically with the adjustment of the transconductance gains of the VDGA. To emphasis the applicability of the proposed circuit, a second-order RC low-pass filter is constructed as an application example. PSPICE simulations are performed to verify the theory.
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