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Author: search.filters.author.Roongmuanpha, NatchanaiSubject: 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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    Floating capacitance multiplier realization based on commercially available integrated circuits
    (2022-06-01)
    Roongmuanpha, Natchanai
    ;
    Tangsrirat, Worapong
    This article is an attempt to present a tunable floating capacitance multiplier using commercially available integrated circuits, namely LT1228. The proposed design utilizes three LT1228s as active electronic components and only one capacitor as a passive component. The multiplication factor of the capacitance multiplier is electronically tunable via adjusting the external supply currents of the LT1228s. Besides, a careful analysis of the parasitic element effects is also included. To verify the practical features of the proposed floating capacitance multiplier circuit, several simulations using PSPICE program tool and extensive laboratory measurements were performed.
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    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.