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Author: search.filters.author.Fongsamut, C.

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    Current-conveyor-based single-element-controlled and current-controlled sinusoidal oscillators
    (2006-07-01)
    Fongsamut, C.
    ;
    Anuntahirunrat, K.
    ;
    Kumwachara, K.
    ;
    Surakampontorn, W.
    A new single-element-controlled sinusoidal oscillator circuit that incorporates two second generation current conveyors (CCIIs), two grounded capacitors and two resistors is presented and analysed. The circuit is beneficial to monolithic integrated circuit implementation by the use of grounded capacitors. In addition, a new current-controlled sinusoidal oscillator using only two second generation current controlled conveyors (CCCIIs) and two grounded capacitors can be achieved by replacing CCIIs and resistors series at X terminals with CCCIIs. The oscillators provide extremely low passive 0 -sensitivities and good frequency stability. Moreover, the oscillation frequencies of the CCII-based and the CCCII-based oscillators can be controlled, respectively, by a grounded resistor and by an external bias current. Experimental and SPICE simulation results that confirm the theoretical predictions are given.
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    On the use of nullator transformation in oscillator circuits
    (2006-01-01)
    Fongsamut, C.
    ;
    Anuntahirunrat, K.
    ;
    Surakampontorn, W.
    ;
    Fujii, N.
    A transformation of two nullators for generating a class of current-conveyor-based oscillator circuit that uses two second generation current conveyor (CCIIs), two capacitors and two resistors is proposed. The generating method is through the representation of the nullator-norator equivalents of oscillator circuits. In addition, half of all circuits can be realized by using RC:CR transformation. There are 6 additional circuits of this kind possible that have not been found in the published literature. © 2006 IEEE.
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    Temperature compensation of translinear current conveyor and OTA
    (1998-04-16)
    Surakampontorn, W.
    ;
    Riewruja, V.
    ;
    Kumwachara, K.
    ;
    Fongsamut, C.
    A simple and integrable temperature compensation scheme for translinear current conveyor-based circuits and OTA-based circuits is introduced. It uses a new bias circuit which has a current that is directly proportional to the absolute temperature, and can also be electronically varied. Performance of the scheme is confirmed through PSPICE simulation results.