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Author: search.filters.author.Surakampontorn, WanlopSubject: search.filters.subject.Current-mode circuits

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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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    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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    High output impedance current-mode universal filter employing dual-output current-controlled conveyors and grounded capacitors
    (2007-02-01)
    Tangsrirat, Worapong
    ;
    Surakampontorn, Wanlop
    A novel current-controlled two-input three-output current-mode universal filter, which employs only three dual-output controlled-controlled current conveyors (DOCCCIIs) and two grounded capacitors, is presented in this paper. The proposed configuration provides inverting-type lowpass, noninverting-type lowpass, inverting-type bandpass, noninverting-type bandpass, highpass, bandstop and allpass current responses at a high impedance terminal, which enable easy cascadability. The filter also offers an independent electronic control of the natural frequency ω<inf>o</inf> and the parameter ω<inf>o</inf> / Q through adjusting the bias current of the DOCCCII. No critical matching condition is required for realizing all the filter responses, and all the incremental parameter sensitivities are low. The performances of the proposed circuit are simulated with PSPICE to confirm the presented theory. © 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.
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    A dual translinear-based true rms-to-dc converter
    (1998-12-01)
    Surakampontorn, Wanlop
    ;
    Kumwachara, Kiattisak
    A new design technique for a true rms-to-dc converter is implemented around a dual translinear-based squarer circuit. A dual translinear loop and current mirrors are the basic building blocks in this realization scheme, and the computation is carried in current-mode. The conversion circuit consists of a squarer, a low-pass filter and a square-root circuit. Since no rectifier function is required, this converter configuration enables us to obtain a wide-band frequency response. The input signal can be voltage or current. In addition, the modification of the converter to construct a vector summation computing circuit is also discussed. © 1998 IEEE.