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Author: search.filters.author.Tanjaroen, WasonSubject: search.filters.subject.Current-mode circuit

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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 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.
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    TISO cascadable current-mode multifunction filter employing current differencing transconductance amplifiers
    (2006-12-01)
    Tanjaroen, Wason
    ;
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    A circuit realization of a current-mode multifunction filter with three inputs and one output employing current differencing transconductance amplifiers (CDTAs) as active components is presented in this paper. The proposed circuit employs only three CDTAs and two grounded capacitors and exhibit low-input and high-output impedances, which is very suitable for an integrated circuit implementation and easy cascading in the current-mode operations. By properly selecting the input current terminals, the proposed filter can realize all standard biquadratic functions, i.e., the lowpass (LP), highpass (HP), bandpass (BP), bandstop (BS) and allpass (AP) filtering functions without changing the circuit configuration. The natural frequency (ω<inf>0</inf>) and the bandwidth (ω<inf>0</inf>Q) of the proposed filter can electronically be tuned by controlling the bias current of the CDTA. The filter also provides the low active and passive sensitivities. Simulation results with PSPICE are used to confirm the presented theory. © 2006 ICASE.