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    PIDA Controller Realized on Commercial IC Current Feedback Operational Amplifiers
    (2017-01-01)
    Buakaew, S.
    ;
    Narksarp, W.
    ;
    Wongtaychatham, C.
    ;
    Sangpisit, W.
    In this paper, the circuit-realization of the proportional – integral – derivative – acceleration (PIDA) controller is presented. The circuit is realized with commercially available active components i.e. only four current feedback operational amplifiers (CFOAs) along with passive R and C components. The parameters of the PIDA controller including the proportional gain, the integral time, the derivative time and acceleration gain can be easily adjusted via these resistors and/or capacitors. The proposed PIDA controller offers simple structure with a small number of active elements to be used. The computer simulations results utilizing commercial IC AD844 are demonstrated to confirm the validity of the proposed PIDA controllers.
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    A four-quadrant multiplier based on CCII+s
    (2010-07-30)
    Narksarp, W.
    ;
    Pawarangkoon, P.
    ;
    Buakaew, S.
    ;
    Kiranon, W.
    ;
    Wardkein, P.
    This paper presents an analog multiplier based on non-inverting (positive type) second generation current conveyor (CCII+). The proposed circuit can perform as a four-quadrant multiplier. The circuit employs only two positive type second generation current conveyors and two n-channel JFET transistors. The circuit does not require any external passive circuit elements. Simulation results are included to confirm the capability of the circuit with the theory. Moreover, applications of the squarer, frequency doubler and amplitude modulator are demonstrated.
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    A four-quadrant current-mode multiplier/divider building block
    (2009-10-26)
    Narksarp, W.
    ;
    Pawarangkoon, P.
    ;
    Kiranon, W.
    ;
    Wadkien, P.
    This paper presents a current-mode analog multiplier/divider based on current conveyors. The proposed circuit employs only two second-generation current conveyors with controlled current gains (KCCIIs). The circuit is active only; it does not require any external passive element. Then, it is suitable for implementation as integrated circuit. The proposed circuit can perform as either a four-quadrant multiplier or a four-quadrant divider without changing its topology. Simulation results of the circuit show good agreement with theoretical analysis. Applications such as modulator, full-wave rectifier and current amplifier are demonstrated to confirm the versatility of the proposed circuit. ©2009 IEEE.