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Author: search.filters.author.Moonmuang, PitchayaninSubject: search.filters.subject.electronically tunable circuit

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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.