Roongmuanpha, Natchanai

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Roongmuanpha, Natchanai
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natchanai.ro@kmitl.ac.th

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    Item type:Publication,
    Floating Inductance Simulator with Electronic Tuning Property Using only Active Elements
    (2023-01-01)
    Roongmuanpha, Natchanai
    ;
    Mongkolwai, Pratya
    ;
    Pukkalanun, Tattaya
    ;
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    This paper discusses the active-only electronically tunable floating lossless inductance simulator, which uses a single fully balanced-voltage differencing buffered amplifier (FB-VDBA) and one operational amplifier (OA). For this implementation, only integrated circuit packages with no external passive components are utilized. The synthetic equivalent inductance value is electronically adjustable via the transconductance gain of the FB-VDBA. Non-idealities of the active element have produced their effects. Using PSPICE with TSMC 0.25-mum CMOS parameter and the LM741 type OA, the performance of the proposed circuit and its application as a second-order voltage-mode lowpass filter is demonstrated. The numerical simulations closely matched the theoretical results.
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    Item type:Publication,
    Practical Floating Capacitance Multiplier Implementation with Commercially Available IC LT1228s
    (2021-03-01)
    Roongmuanpha, Natchanai
    ;
    Tangsrirat, Worapong
    A practical realization of a tunable floating capacitance multiplier using commercially available integrated circuits, namely LT1228 is proposed. The synthetic capacitor utilizes only two IC LT1228s along with two passive components (one resistor and one capacitor). The capacitance multiplication factor is electronically controllable through the transconductance gain of the LT1228. The effects of non-ideal transfer gains and parasitic elements of the LT1228 on the circuit performance have been evaluated in detail. The applicability of the proposed floating capacitance multiplier as a second-order band-pass filter is also presented. The claimed theory is verified by several PSPICE simulations and experimental test results.
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    Item type:Publication,
    Dual-Mode Tunable First-Order Universal Filters with Single VDGA
    (2024-01-01)
    Roongmuanpha, Natchanai
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    This article explores two compact structures to implement dual-mode first-order universal filters, providing lowpass, highpass, and allpass responses from the same structure. Both circuits offer savings in active components as they employ a single voltage differencing gain amplifier (VDGA). The first proposed filter has voltage inputs and current/voltage outputs with a single capacitor, which can perform three distinct filter functions in both voltage mode (VM) and trans-admittance mode (TAM). The latter filter, with current inputs and current/voltage outputs, consists of one capacitor and one resistor, which is capable of operating in both current mode (CM) and trans-impedance mode (TIM). Both of the proposed filters also offer an electronic adjustment of the passband gain and pole frequency through the VDGA’s transconductance values. The non-ideal implications of the VDGA on the first-order filters' performance are thoroughly examined. Computer simulations and experimental testing measurements validate the theoretical analyses.