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Author: search.filters.author.Sangpisit, W.

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    PIDA Controller Realized on Commercial IC Current Feedback Operational Amplifiers
    (2017-01-01)
    Buakaew, S.
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    Narksarp, W.
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    Wongtaychatham, C.
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    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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    Simple and accurate frequency to voltage converter
    (2010-07-30)
    Lorsawatsiri, A.
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    Kiranon, W.
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    Silaruam, V.
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    Sangpisit, W.
    ;
    Wardkein, P.
    A new technique has been developed for frequency to voltage converter. This technique, based on a very simple operating principle, comprises a differentiator, two RMS-DC converters, and a divider. The proposed converter provides an accurate output and a linear transfer characteristic. Moreover, its output response has input-amplitude independent characteristic. The performance of this converter is evaluated by computer simulation. The simulation results are in good accordance with the theoretical analyses.
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    A linearized source-couple pair transconductor using a low-voltage square root circuit
    (2008-10-06)
    Ngamkham, W.
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    Kiatwarin, N.
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    Narksap, W.
    ;
    Sangpisit, W.
    ;
    Kiranon, W.
    This paper presents a CMOS transconductor linearization by connecting square-rooter to a source couple pair circuit. A novel square-rooting circuit is proposed for low voltage operation. The proposed transconductance circuit is compact and consumes lower quiescent power, compared with the existing transconductors using the same realization technique. The circuit performances verification by PSPICE simulations show good results as expected. © 2008 IEEE.
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    Multiphase sinusoidal oscillators using translinear current conveyors and only grounded passive components
    (2001-01-01)
    Loescharataramdee, C.
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    Kiranon, W.
    ;
    Sangpisit, W.
    ;
    Yadum, W.
    A generalized multiphase sinusoidal oscillator is presented. The circuit realization uses the translinear bipolar second generation current-controlled conveyors to generate arbitrary n current signals equally spaced in phase. The proposed circuit consists of n multi-output current controlled conveyors and a current amplifier connected in cascade. The only passive component employed in each of the n conveyors is one grounded capacitor. The oscillation condition and oscillation frequency are independently controlled. The former depends only on the number of the phase signals of the oscillator. The dependency of the latter on the input resistance of the input ports of the current conveyors makes electronic tunability possible using the bias currents. The circuit also enjoys having simple structure and very low component count and it is highly suitable for monolithic implementation.
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    Electronically tunable multifunctional translinear-C filter and oscillator
    (1997-03-27)
    Kiranon, W.
    ;
    Kesorn, J.
    ;
    Sangpisit, W.
    ;
    Kamprasert, N.
    The current-controlled second order multifunctional filter is described. It uses only three current controlled conveyors and two grounded capacitors. Three types of current transfers, highpass, bandpass, and lowpass, can be acheived simultaneously and both ω<inf>0</inf>, and Q are electronically adjustable. The circuit can also be modified to be a current controlled oscillator. The simulated results are illustrated.