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Author: search.filters.author.Tangsrirat, WorapongSubject: search.filters.subject.Operational transconductance amplifier (OTA)

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    New Resistor-Less Electronically Tunable OTA-based Fully Floating FDNR Simulator
    (2023-05-01)
    Bhardwaj, Kapil
    ;
    Srivastava, Mayank
    ;
    Tangsrirat, Worapong
    A floating FDNR using four OTAs (operational transconductance amplifiers) and two grounded capacitances have been reported in this article. As per the reviewed literature, the proposed floating FDNR is based upon a minimum number of transistors with a resistor-less and grounded capacitances based structure as compared to any other FDNR simulators and can be considered the most compact configuration ever reported. It offers some excellent features like; electronically tunable behavior, purely resistor-less architecture, no restraint of parameter values matching, use of only grounded capacitances, and fully symmetric floating architecture. We have investigated the circuit for port parasitics and non-ideal gains of the employed OTAs and presented the analysis. It is found that the circuit nature remains almost unchanged in non-ideal conditions. The influence of frequency-dependent transconductance has also been analyzed. The FDNR simulation through the reported circuit has been verified through the PSPICE-generated simulation results. The higher-order CDR filtering circuit application of the proposed FDNR has also been reported and checked through simulations. The presented OTA-based FDNR has been experimentally verified through the CA3080 IC-based implementation and results are discussed.
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    Simple current-mode square-rooting circuit with temperature compensation using only OTAs
    (2010-01-01)
    Tangsrirat, Worapong
    ;
    Prasertsom, Danucha
    ;
    Pukkalanun, Tattaya
    ;
    Surakampontorn, Wanlop
    A simple current-controlled current-mode square-rooting circuit with temperature compensation employing operational transconductance amplifi ers (OTAs) as active elements is proposed. It has been designed by using only four OTAs, without the employment of additional passive elements. The current gain of the proposed circuit can be electronically controlled, thanks to the tuning property of the OTA. Simulation and experimental results are obtained to verify the theoretical analysis of the proposed circuit technique.
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    Temperature-insensitive current-mode square-rooting circuit using OTAs
    (2008-12-01)
    Prasertsom, Danucha
    ;
    Unhavanich, Sumalee
    ;
    Tangsrirat, Worapong
    A simple current-mode square-rooting circuit with temperature compensation employing operational transconductance amplifiers (OTAs) as active elements is proposed. It has been designed by using only four OTAs without the employment of additional passive elements. The current gain of the proposed circuit can be electronically controlled, thanks to the tunability property of the OTA. Simulation results are obtained to verify the theoretical analysis of the proposed circuit technique. © 2008 SICE.