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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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    CFOA-based single resistance controlled quadrature oscillator
    (2008-12-01)
    Mongkolwai, Pratya
    ;
    Pukkalanun, Tattaya
    ;
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    This paper presents a new single-resistance-controlled (SRC) sinusoidal quadrature oscillator with reduce number of passive elements using only two current-feedback operational amplifiers (CFOAs). The proposed oscillator configuration comprising two CFOAs, three resistors and two capacitors provides two sinusoidal voltage outputs in phase quadrature. The circuit has the advantage of independent control of the condition of oscillation and the oscillation frequency through a single resistor. In addition, both proposed circuit configurations have good active and passive sensitivity performance. PSPICE simulation results based on commercially available AD844-type CFOAs are also included, showing the excellent performance of the proposed oscillator configuration. © 2008 SICE.