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Author: search.filters.author.Tanjaroen, WasonSubject: search.filters.subject.Current differencing transconductance amplifier (CDTA)

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    Resistorless current-mode quadrature sinusoidal oscillator using CDTAs
    (2009-12-01)
    Tanjaroen, Wason
    ;
    Tangsrirat, Worapong
    A circuit technique for realizing a current-mode quadrature sinusoidal oscillator using current differencing transconductance amplifiers (CDTAs) as active components is presented in this paper. The proposed circuit employing only three CDTAs and two grounded capacitors can provide two quadrature sinusoidal current outputs with 90° phase difference. The oscillation condition and the oscillation frequency (ω<inf>o</inf>) of the proposed circuit can be electronically and orthogonally tuned. Simulation results with PSPICE are used to confirm the presented theory.
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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.
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    Current-mode second-order notch filter using CDTA-based allpass sections
    (2008-12-01)
    Tanjaroen, Wason
    ;
    Tangsrirat, Worapong
    A circuit technique for realizing a current-mode second-order notch filter using CDTA-based first order allpass sections is presented in this paper. The proposed circuit employs only four CDTAs and two virtually grounded capacitors, and exhibit low-input and high-output impedances, which is suitable for cascading in current-mode operation. The circuit also has low passive and active sensitivities. Moreover, if the active and passive component values are properly chosen, the circuit permits the realization of second-order allpass current response. PSPICE simulation results are used to verify the theoretical analysis. © 2008 SICE.