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Subject: search.filters.subject.CDTA

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    New current-controlled current-mode sinusoidal quadrature oscillators using CDTAs
    (2015-01-01)
    Summart, Saksit
    ;
    Thongsopa, Chanchai
    ;
    Jaikla, Winai
    This article presents new current-mode oscillator circuits using CDTAs which is designed from block diagram. The proposed circuits consist of three CDTAs and two grounded capacitors. The condition of oscillation can be adjusted electronically/orthogonally from the oscillation frequency by adjusting bias current of the CDTAs. The proposed quadrature oscillators have high output impedance and use only grounded capacitors without any external resistor which is very appropriate for future development into an integrated circuit. The PSPICE simulation and experimental results are corresponding to the theoretical analysis.
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    Design of low input and high output impedance current-mode biquad filter using CDTAs with independent control of quality factor and pole frequency
    (2013-12-31)
    Sattanaco, Somsak
    ;
    Jaikla, Winai
    ;
    Supavarasuwat, Piya
    ;
    Jaikhang, Wipobh
    In this study, a single-input multiple-outputs current-mode analog biquadratic filter, based on current differencing transconducatance amplifier (CDTA) is presented. The proposed filter uses two CDTAs, one resistor and two grounded capacitors, which is well suited for integrated circuit implementation. The circuit simultaneously gives 3 standard transfer functions, namely, lowpass, highpass and bandpass filters with independent control of quality factor and pole frequency by electronic method. By summing of I<inf>HP</inf> and I<inf>LP</inf>, the notch filter can be also achieved. Moreover, the circuit possesses low input and high output impedance which would be an ideal choice for current-mode cascading. The PSPICE simulation results are included verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation. © 2013 IEEE.
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    Electronically tunable current-mode quadrature oscillator using current differencing transconductance amplifiers
    (2009-12-01)
    Kumngern, Montree
    ;
    Dejhan, Kobchai
    A new electronically tunable single-element-controlled current-mode quadrature oscillator circuit using current differencing transconductance amplifiers (CDTAs) is presented. The proposed oscillator is consisted of two CDTAs, two grounded capacitors and one grounded resistor, which is beneficial to monolithic integrated circuit implementation. The oscillation condition and oscillation frequency of the circuit are independently controllable. Also, the oscillation frequency can be controlled by a bias current of CDTA. The realized of the circuit provides four quadrature current outputs at high output impedance nodes. PSPICE simulation results that confirm the theoretical predictions are given. © 2009 IEEE.
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    Current-mode multiphase sinusoidal oscillator using current differencing transconductance amplifiers
    (2008-02-01)
    Tangsrirat, Worapong
    ;
    Tanjaroen, Wason
    This paper describes a simple current-controlled current-mode multiphase sinusoidal oscillator based on current differencing transconductance amplifiers (CDTAs) as active components. The proposed oscillator circuit, which employs only one CDTA and one grounded capacitor for each phase, can generate arbitrary n current-output signals (n being even or odd) equally spaced in phase, all at high output impedance terminals. The oscillation condition and the oscillation frequency can be controlled electronically and independently through the bias current of the CDTA. The oscillator has low-component count, low-sensitivity performance, and is highly suitable for monolithic implementation. PSPICE simulation results are given to confirm the operation of the proposed oscillator. © Birkhäuser Boston 2007.