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Access type: UnknownSubject: search.filters.subject.Electronically adjustable

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    Practical realization of electronically adjustable universal filter using commercially available IC-based VDBA
    (2021-01-01)
    Roongmuanpha, Natchanai
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    This paper describes the practical realization of electronically adjustable voltage-mode universal filter with three inputs and single output (TISO) using the commercially available integrated circuit (IC)-based voltage differencing buffered amplifiers (VDBAs). The realization is resistor-less and contains only two VDBAs and two capacitors. The described filter structure can realize all the five standard biquadratic filter functions from the same configuration without needing any component matching criterions. It also exhibits low-output impedance, which enables for easy cascading in voltage-mode operation. Owing to practical VDBA realization, the filter circuit can be easily made electronically tunable with orthogonal ω<inf>o</inf>-Q tuning. The effects of the VDBA non-idealities on the filter performance have been analyzed in detail. To prove the theoretical finding, the performance of the studied circuit was also experimentally measured using the operational transconductance amplifier CA3080 and the operational amplifier LF356 ICs.
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    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.
      1