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Author: search.filters.author.Dumawipata, TeerasilapaSubject: search.filters.subject.Current-mode circuits

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    Multiple-input single-output current-mode multifunction filter using current differencing transconductance amplifiers
    (2007-04-02)
    Tangsrirat, Worapong
    ;
    Dumawipata, Teerasilapa
    ;
    Surakampontorn, Wanlop
    A novel current-controlled multiple-input single-output current-mode universal filter employing current differencing transconductance amplifiers (CDTAs) as active elements is described. The proposed circuit offers the following attractive features: employment of the minimum number of active and passive components; simultaneous realization of all the standard filtering functions; independent current-control of the parameters ω<inf>o</inf> and ω<inf>o</inf> / Q; no requirement of component matching conditions; employment of only two grounded passive capacitors which is suitable for integrated circuit (IC) implementation; and low passive and active sensitivities. PSPICE simulation results are given to verify the theoretical analysis. An example application using the proposed circuit in cascade realization of the high-order current-mode filter is also presented. © 2006 Elsevier GmbH. All rights reserved.
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    FTFN with variable current gain
    (2001-12-01)
    Tangsrirat, Worapong
    ;
    Unhavanich, Sumalee
    ;
    Dumawipata, Teerasilapa
    ;
    Surakampontorn, Wanlop
    This paper proposes a circuit configuration for the realization of a four-terminal floating nullor (FTFN) with electronically tunable current gain. It mainly consists of an op amp in input together with two complementary current mirrors with controlled gain and two standard improved Wilson current mirrors. The validity of the performance of the scheme is verified through PSPICE simulation results. Some example applications in the design of the proposed tunable FTFN as a tunable active element show that the circuit properties can be varied by electronic means are also included.