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Author: search.filters.author.Channumsin, OrapinSubject: search.filters.subject.Capacitance multiplier

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    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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    Electronically adjustable capacitance multiplier circuit with a single Voltage Differencing Gain Amplifier (VDGA)
    (2019-01-01)
    Tangsrirat, Worapong
    ;
    Channumsin, Orapin
    ;
    Pimpol, Jirapun
    In this work, we propose a resistorless realization of a simple electronically adjustable capacitance multiplier circuit using a single voltage differencing gain amplifier (VDGA) as an active building block. The circuit utilizes one VDGA and only one capacitor in a simple circuit configuration. The proposed capacitance multiplier circuit can be tuned electronically with the adjustment of the transconductance gains of the VDGA. To emphasis the applicability of the proposed circuit, a second-order RC low-pass filter is constructed as an application example. PSPICE simulations are performed to verify the theory.