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Author: search.filters.author.Tangsrirat, WorapongSubject: search.filters.subject.electronically tunable circuit

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    Triple-input single-output electronically controlled voltage-mode biquadratic filter
    (2019-07-01)
    Roongmuanpha, Natchanai
    ;
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    This article presents the possibility of realizing a voltage-mode biquadratic filter having with three input terminals and single output terminal. The circuit employing only two voltage differencing gain amplifiers (VDGAs) together with two capacitors can realize all the five standard biquadratic filter functions at a single low-impedance-output terminal. It also provides orthogonal current tuning of the natural angular frequency (ω<inf>o</inf>) and the quality factor (Q), and has low active and passive element sensitivities. To confirm the theory, simulation results using PSPICE software are accomplished.
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    Simple current-controlled VDTA-R schmitt trigger circuit
    (2019-07-01)
    Moonmuang, Pitchayanin
    ;
    Unhavanich, Sumalee
    ;
    Tangsrirat, Worapong
    A simple current-controlled Schmitt trigger circuit employing single voltage differencing transconductance amplifier (VDTA) and only two grounded resistors is presented. The proposed Schmitt trigger circuit offers independent electronic adjustability of its threshold voltage levels and output voltage amplitudes by the help of corresponding VDTA bias currents. In addition, both clockwise and counter-clockwise hystereses are also achievable. To justify the theoretical predictions, the verification of the proposed Schmitt trigger circuit is performed by PSPICE simulation software using TSMC 0.25μm CMOS technology.
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    VDBA-Based series RC impedance simulator using single grounded capacitor
    (2018-08-13)
    Moonmuang, Pitchayanin
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    This work presents an electronically tunable series RC impedance simulator circuit by means of the recently introduced active element, called voltage differencing buffered amplifier (VDBA). The proposed circuit employs only two VDBAs and one grounded capacitor, which is canonic in the number of components. The simulated equivalent element values can be tuned electronically through the VDBA transconductance gain. The circuit also does not require any component-matching conditions. The non-ideal gain effects of the VDBA on the simulated capacitance value are also evaluated and discussed. PSPICE simulations, which are in a close agreement with the analytical calculations, are included.
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    Active simulation of electronically tunable grounded lossless inductor using voltage differencing inverting buffered amplifiers
    (2018-08-13)
    Roongmuanpha, Natchanai
    ;
    Unhavanich, Sumalee
    ;
    Tangsrirat, Worapong
    An actively simulated grounded lossless inductor based on employing voltage differencing inverting buffered amplifiers (VDIBAs) as new active components has been presented. The synthetic canonical inductor uses only two VDIBAs and one grounded capacitor. The simulator provides the advantage feature of electronic control of its equivalent inductance via the transconductance parameter of the VDIBA, and also does not need critical element matching conditions. An illustrative application of the proposed tunable grounded lossless inductor on the realization of an active RLC second-order bandpass filter has been designed. The usability of the proposed circuit has been evaluated using PSPICE simulations based on VDIBA implemented in TSMC 0.25-μ m CMOS technology, and the simulated results demonstrate a sufficient agreement with the theoretical conclusions.