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Subject: search.filters.subject.current differencing cascaded transconductance amplifier

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    Resistorless current-mode universal filter using current differencing cascaded transconductance amplifiers
    (2018-06-08)
    Duangmalai, Danupat
    ;
    Jaikla, Winai
    In this paper, a new realization of a current-mode universal filter using the current differencing cascaded transconductance amplifiers (CDCTAs) and grounded capacitors is proposed. The tune of the natural frequency and the quality factor can be independently done with electronic method by adjusting the bias current. The proposed filter provides low-pass, high-pass and band-pass responses in the same circuit. The input current node has low impedance and the output current nodes have high impedance which is attractive for cascading without the use of the current buffer. The performances of the proposed filter are verified by numerous PSpice simulations using the model parameters of the NR200N and PR2000N bipolar junction transistor arrays ALA400 from AT&T with ±2 V supply voltages.
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    Third order quadrature sinusoidal oscillator using single CDCTA
    (2017-07-02)
    Kumngern, Montree
    ;
    Torteanchai, Usa
    A novel third order quadrature oscillator using current differencing cascaded transconductance amplifier (CDCTA) has been described in this paper. The oscillator that has been proposed consists of three grounded capacitors and one active element that result both voltage and current output signals. The grounded capacitor usage obtains the circuit ideal for the implementation of integrated circuit (IC). The terminal of current output possesses level of high-impedance that could be directly connected to the next stage without using buffer circuits. The frequency of oscillation and condition of oscillation could be controlled electronically and orthogonally by setting the bias currents. The oscillator that was proposed has been used to apply for an amplitude modulation signal generator. To confirm the structure that was proposed has used the results of PSPICE simulation.