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Author: search.filters.author.Luangphakorn, Supachai

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    Design all-pass transfer function configuration using a notch distributed RC network
    (2007-12-01)
    Pirajnanchai, Virote
    ;
    Luangphakorn, Supachai
    ;
    Janchitrapongvej, Kanok
    In this paper describers a new and interesting notch distributed RC networks configuration that realizes an all-pass network function is proposed. The circuit is presented with which an all-pass transfer function of arbitrary order, having simple negative real poles, has been realized by combining the output of notch distributed RC networks with a portion of its input in a differential amplifier. The experimental results for such an all-pass function is also indicated. This network circuit has the advantage that the gain constant of all-pass function may be varied by varying the gain of differential amplifier.
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    Novel technique using single pole amplifier in sinewave oscillator
    (2004-07-12)
    Pirajnanchai, Virote
    ;
    Luangphakorn, Supachai
    ;
    Nakasuwan, Jintana
    ;
    Janchitrapongvej, Kanok
    It has been known that a given single or more op-amps RC sinusoidal oscillator has four distinctly different, equivalent, stable forms. This paper different structure have been proposed to overcome the frequency limitations associated with Uniformly Distributed RC line (URCs) network and single pole amplifier based adjustable frequency sinusoidal oscillator. The simulation and experimental results are in reasonably good agreement with the theoretical, and very low harmonic distortion. In this circuit can be suitable for LSI process fabrication.
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    Designing active lowpass filter using uniformly distributed RC line
    (2003-12-01)
    Panyanouvong, Nouanchanh
    ;
    Luangphakorn, Supachai
    ;
    Pirajnanchai, Virote
    ;
    Tangisanon, Prakit
    ;
    Janchitrapongvej, Kanok
    The paper describes low pass filter using uniformly distributed RC line (herein after called URC̄). The proposed circuit configuration consists of one URC̄ with double capacitive layers and one pole gain amplifier. Experimental results of Matlab simulations are carried out and sensitivities of circuit parameters are also investigated. © 2003 IEEE.