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,
    Grounded Immittance Simulation and PID Control Application
    (2026-01-01)
    Channumsin, Orapin
    ;
    Unhavanich, Sumalee
    ;
    Roongmuanpha, Natchanai
    ;
    Tangsrirat, Worapong
    This communication introduces a grounded immittance function simulator. The circuit employs a single differential voltage to current converter (DVTC) in association with three passive elements. The grounded series type RL and RC simulator can be realized by selecting the proper position of all passive elements. The equivalent resistance, inductance, and capacitance accomplished from the proposed circuit can be adjusted with a passive resistor. DVTC non-idealities on the proposed simulator are also discussed in detail. The voltage mode PID controller has been suggested as an application using the proposed simulator. The performance of the proposed simulator and controller applications have been carried out through PSPICE simulation. The results are certified by the theoretical prediction.