Moonmuang, Pitchayanin

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Moonmuang, Pitchayanin
Alternative Name
Moonmuang, P.
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Email
pitchayanin.mo@kmitl.ac.th

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    Item type:Publication,
    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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    Item type:Publication,
    VDTA-based floating/grounded series/parallel R-L and R-C immittance simulators with a single grounded capacitor
    (2023-02-01)
    Moonmuang, Pitchayanin
    ;
    Faseehuddin, Mohammad
    ;
    Pukkalanun, Tattaya
    ;
    Herencsar, Norbert
    ;
    Tangsrirat, Worapong
    Active configurations for simulating floating/grounded series and parallel immittance functions based on voltage differencing transconductance amplifiers (VDTAs) are proposed. The grounded series and parallel immittance simulators presented here require only one VDTA, while the proposed floating ones only need two. Each of the suggested simulators uses a single grounded capacitor. The proposed topologies can imitate R-L and R-C immittances in both series and parallel types. All of the simulated equivalent elements are electronically adjustable through the VDTA's transconductance. Furthermore, no component-matching restrictions are imposed in order to achieve the appropriate immittance function. Applications of the proposed VDTA-based immittance simulators include bandpass filter and quadrature oscillator implementations. The behaviors of the proposed circuits and their applications are evaluated by PSPICE simulations and experimental observations using VDTA implemented with commercially available CA3080 type OTAs.
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    Floating/grounded series/parallel R-L, R-C and L-C immittance simulators employing VDTAs and only two grounded passive elements
    (2022-02-01)
    Moonmuang, Pitchayanin
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    In this paper, four floating/grounded series and parallel immittance simulator topologies are proposed, utilizing voltage differencing transconductance amplifiers (VDTAs) as useful active devices. Each of the proposed topologies requires only two grounded passive components. The floating series and parallel simulated immittance circuits proposed here require just two VDTAs, whilst the grounded ones require only one. The proposed topologies can simulate R-L, R-C, and L-C immittances in series and parallel. All of the simulated equivalent elements for the realized immittances are orthogonal adjustable. Furthermore, there are no critical element equality criteria required for the desired immittance function realization. The behavior of the proposed VDTA-based immittance simulators is exemplified in LC ladder filter and sinusoidal oscillator applications. To illustrate the simulator's performance, PSPICE simulation and experimental test results are used.