Roongmuanpha, Natchanai

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

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    Item type:Publication,
    Design and Synthesis of Capacitance Multiplier Using LT1228s and a Grounded Capacitor
    (2026-01-01)
    Channumsin, Orapin
    ;
    Roongmuanpha, Natchanai
    ;
    Likhitkitwoerakul, Nutcha
    ;
    Tangsrirat, Worapong
    In this study, the design and synthesis of a grounded capacitance multiplier is discussed. The proposed circuit consists of two commercially available integrated circuits (ICs) named LT1228, together with a single grounded capacitor as a passive element. The transconductance gain of LT1228 allows for electronic control of the simulated equivalent capacitance value. The LT1228 transconductance gain is easily adjusted through the external bias current, which has a wide adjustable range of 1 µA to 1 mA. No component matching is required for the designed simulator. A non-ideal analysis of the proposed circuit has been investigated in detail. The workability of the proposed circuit and its application example as a first-order lowpass filter has been confirmed with the theoretical findings through PSPICE software. The results indicate that the proposed simulator has excellent performance and matches the theory.
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    Item type:Publication,
    Practical Realization of Only Active Floating Lossless Inductance Simulator
    (2024-01-01)
    Roongmuanpha, Natchanai
    ;
    Unhavanich, Sumalee
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    This paper describes an electronically controllable floating lossless inductance simulator circuit implemented with only off-the-shelf available integrated circuits, namely LT1228 and operational amplifier (OA). The proposed design consists solely of two LT1228s and a single OA. By using an active element named LT1228, the equivalent inductance can be tuned electronically with depended on the externally supplied current applied to LT1228. The proposed simulator imposed just one component matching restriction that required the equality of two transconductances. It is easily attainable with a simple current mirror. The worthiness of the proposed floating inductance simulator has been proven and applied to the construction of the 2nd-order RLC highpass/bandpass filter as an application. PSPICE simulations are used to investigate the characteristics of the proposed simulator and its filter realization.