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Author: search.filters.author.Pukkalanun, TattayaSubject: search.filters.subject.Current differencing transconductance amplifier (CDTA)

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    Synthesis of current differencing transconductance amplifier-based current limiters and its applications
    (2011-04-01)
    Tangsrirat, Worapong
    ;
    Pukkalanun, Tattaya
    ;
    Surakampontorn, Wanlop
    A synthesis of analog current limiter (CL) building blocks based on a current differencing transconductance amplifier (CDTA) is proposed. The breakpoint and the slope of the resulting transfer characteristic obtained from the proposed CDTA-based CL are electronically programmable through the external bias currents. To demonstrate versatility of the proposed electronically tunable CLs, some nonlinear applications to programmable current-mode precision full-wave rectifiers and piecewise-linear function approximation generators are also presented. PSPICE simulation and experimental results confirm the effectiveness of the proposed circuits. © 2011 World Scientific Publishing Company.
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    Simple current-mode analog multiplier, divider, square-rooter and squarer based on CDTAs
    (2011-03-01)
    Tangsrirat, Worapong
    ;
    Pukkalanun, Tattaya
    ;
    Mongkolwai, Pratya
    ;
    Surakampontorn, Wanlop
    In this paper, the design of simple analog current-mode multiplier, divider, square-rooter and squarer circuits using only two current differencing transconductance amplifiers (CDTAs) is proposed. With the selection of the applied input currents, the proposed circuit can perform four-quadrant current multiplication, division and current-controlled current amplification, without changing its configuration. Moreover, the current-mode square-rooter and squarer circuits can easily be obtained with the possibility of electronically transfer gain adjustment by slight modification of the proposed configuration. All the proposed circuits are insensitive to ambient temperature variations. Additionally, the CDTA non-ideality effects on the proposed circuits are also investigated and discussed. The performances of the realized circuits are examined by PSPICE simulations. © 2010 Elsevier GmbH. All rights reserved.
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    Resistorless realization of current-mode first-order allpass filter using current differencing transconductance amplifiers
    (2010-02-01)
    Tangsrirat, Worapong
    ;
    Pukkalanun, Tattaya
    ;
    Surakampontorn, Wanlop
    This paper presents a realization of a current-mode first-order allpass filter using two current differencing transconductance amplifiers (CDTAs) as the active components and one virtually grounded capacitor as the only passive component. The proposed filer requires no external resistor and is electronically adjustable by varying the external bias current of the CDTA. No component-matching constraints are required. The circuit realizes both inverting and non-inverting types of allpass filters, and also exhibits high-output impedances, which are easy cascading in the current-mode operation. As an application of the proposed CDTA-based allpass section, a current-mode quadrature oscillator is realized. PSPICE simulation results are given to confirm the theoretical analysis. © 2010 Elsevier Ltd. All rights reserved.
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    Current-mode multiphase sinusoidal oscillator using CDTA-based allpass sections
    (2009-07-01)
    Tangsrirat, Worapong
    ;
    Tanjaroen, Wason
    ;
    Pukkalanun, Tattaya
    In this work, a current tunable current-mode multiphase sinusoidal oscillator (MSO) employing current differencing transconductance amplifier (CDTA)-based first-order allpass sections is presented. The proposed MSO circuit, which uses only two CDTAs and one virtually grounded capacitor for each phase, can generate arbitrary 2 n-phase current-output signals (n = 2, 3, 4, ...) equally spaced in phase, all at high output impedance terminals. The oscillation condition and the oscillation frequency can be controlled electronically and independently by adjusting the bias current of the CDTA. The oscillator has low-sensitivity performance. Simulation results are also given to verify the functionality of the proposed oscillator. © 2008 Elsevier GmbH. All rights reserved.