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Author: search.filters.author.Torteanchai, UsaSubject: search.filters.subject.analog signal processing

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    Four-input four-output current-mode multifunction filter using CDTAs
    (2017-07-02)
    Kumngern, Montree
    ;
    Torteanchai, Usa
    This paper proposed a novel four-input four-output current-mode employing two grounded capacitors and two current differencing transconductance amplifiers (CDTAs) from a universal filter and it has been done. The filter could implement five filtering functions on a single topology. The conditions of passive component-matching and requirements of inverting-type input signal are absent in implementing of these filtering functions. The bias currents could control the natural frequency electronically meanwhile the filter passive and active sensitivities are low. To confirm between both the proposed filter and presented theory, the PSPICE simulation results were taken and carried out.
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    Quadrature Oscillator Using Operational Transresistance Amplifiers
    (2016-07-02)
    Torteanchai, Usa
    ;
    Phatsornsiri, Punnavich
    ;
    Kumngern, Montree
    This paper presents a new quadrature oscillator using operational transresistance amplifiers (OTRAs). The use of OTRA as active elements which offers low parasitic parameters, high slew rate and high bandwidth independent of the gain, precision of oscillating frequency can be achieved. The oscillating frequency and oscillating condition of proposed oscillator can be independently controlled. Also output terminals are possessed low impedance level which can be directly connected to the load without any buffer circuits. Simulation results verifying the theoretical analysis are included to confirm proposed structure. From simulation results, it can be expressed that the simulation result is very agree well with theory.
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    Current-controlled quadrature oscillator using a new single ZC-CG-CCCCTA
    (2012-07-16)
    Kumngern, Montree
    ;
    Torteanchai, Usa
    This paper presents a new current-controlled current-mode quadrature oscillator using a single z-copy current gain current-controlled current conveyor transconductance amplifier (ZC-CG-CCCCTA) and two grounded capacitors, which is very suitable for integrated circuit implementation. The condition of oscillation and the frequency of oscillation can be controlled independently and electronically by adjusting the biasing currents of the ZC-CG-CCCCTA. The circuit also provides four quadrature current outputs with high impedance terminals. Simulation results are included to support the workability of the proposed circuit. © 2012 IEEE.