Wisetphanichkij, Sompong

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Wisetphanichkij, Sompong
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Email
sompong.wi@kmitl.ac.th

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    Item type:Publication,
    A design of ternary Schmitt trigger circuit
    (1999-12-01)
    Angkaew, Krit
    ;
    Wisetphanichkij, Sompong
    ;
    Dejhan, Kobchai
    ;
    Cheevasuvit, Fusak
    ;
    Junnapiya, Somyot
    This paper proposes a design of Schmitt trigger circuit with multi-level signal or ternary Schmitt trigger. The circuit operates on current mode with two-current comparator circuits by using positive feedback technique, the threshold current can be generated. And the last stage is V-I converter uses to produce and combine each hysteresis loop as the ternary Schmitt trigger operation. All results have been verified by simulating on PSpice based on ES2 technology model.
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    High-speed and low-power ECL circuits design based on BiCMOS technology
    (1998-12-01)
    Wisetphanichkij, Sompong
    ;
    Dejhan, Kobchai
    ;
    Cheevasuvit, Fusak
    This paper proposes the high speed digital circuit design techniques in order to obtain the small circuit area and low power dissipation. The proposed techniques are a developed feedback controlled current source-active pull down-emitter coupled logic (FCCS-APD-ECL) and a current mirror biasing circuit of gated diode-active pull down-emitter coupled logic (GD-APD-ECL). The technique of FCCS-APD-ECL is used to obtain small circuit chip area and low power dissipation, the technique of GD-APD-ECL is used to obtain the high speed of the circuit. Both proposed circuits performances are carried out.
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    A design of current-mode all-pass oscillator based on current conveyor circuit
    (1999-12-01)
    Dejhan, Kobchai
    ;
    Konthong, Siri
    ;
    Wisetphanichkij, Sompong
    ;
    Nokyoo, Chuae
    ;
    Cheevasuvit, Fusak
    This paper proposes an oscillator circuit design operating in current-mode all-pass network by using the second generation positive current conveyor (CCII) in corporating with passive component to control the frequency. The feedback part is all-pass network consists of current conveyor, passive component and current mode signal amplifier. This current-mode oscillating circuit is able to generate the higher frequency when compared with the voltage-mode circuit.