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Author: search.filters.author.Pawarangkoon, P.

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    A four-quadrant multiplier based on CCII+s
    (2010-07-30)
    Narksarp, W.
    ;
    Pawarangkoon, P.
    ;
    Buakaew, S.
    ;
    Kiranon, W.
    ;
    Wardkein, P.
    This paper presents an analog multiplier based on non-inverting (positive type) second generation current conveyor (CCII+). The proposed circuit can perform as a four-quadrant multiplier. The circuit employs only two positive type second generation current conveyors and two n-channel JFET transistors. The circuit does not require any external passive circuit elements. Simulation results are included to confirm the capability of the circuit with the theory. Moreover, applications of the squarer, frequency doubler and amplitude modulator are demonstrated.
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    A four-quadrant current-mode multiplier/divider building block
    (2009-10-26)
    Narksarp, W.
    ;
    Pawarangkoon, P.
    ;
    Kiranon, W.
    ;
    Wadkien, P.
    This paper presents a current-mode analog multiplier/divider based on current conveyors. The proposed circuit employs only two second-generation current conveyors with controlled current gains (KCCIIs). The circuit is active only; it does not require any external passive element. Then, it is suitable for implementation as integrated circuit. The proposed circuit can perform as either a four-quadrant multiplier or a four-quadrant divider without changing its topology. Simulation results of the circuit show good agreement with theoretical analysis. Applications such as modulator, full-wave rectifier and current amplifier are demonstrated to confirm the versatility of the proposed circuit. ©2009 IEEE.
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    Externally linear current amplifiers
    (2007-06-01)
    Tongkulboriboon, S.
    ;
    Pawarangkoon, P.
    ;
    Kiranon, W.
    This paper describes a method to implement externally linear internally non-linear (ELIN) current amplifiers. Two novel schemes of ELIN current amplifier circuits are proposed, including hyperbolic sine (SINH) and hyperbolic tangent (TANH) circuits. The obtained linear input-current ranges of SINH and TANH circuits are 400 Ap-p with total harmonic distortion (THD) less than 2% and 140 Ap-p with THD less than 0.2%, respectively, both at the input frequency 1 kHz. Also, the current gains of the proposed circuits can be varied either in positive or negative region by adjusting the dc bias currents. Their current gains are tunable in the range of -10 A/A to 10 A/A and insensitive to temperature. Simulation results show that the performance of the circuits are as good as expected.
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    A novel noninteracting electronically tunable universal filter
    (2006-12-01)
    Ngamkham, W.
    ;
    Pawarangkoon, P.
    ;
    Kiranon, W.
    A noninteracting electronically tunable universal filter is proposed in this paper. The proposed circuit can simultaneously realize highpass, lowpass and bandpass transfer functions without changing the circuit topology. Also, the circuit is implemented by using four CCCIIs with controlled current gain and two grounded capacitors which is suitable for IC implementation. Moreover, the proposed circuit can be simply modified to achieve bandstop and allpass responses. The parameters ω<inf>0</inf>, Q and H<inf>0</inf> of the filter are independently tunable. The PSPICE simulation results show that the proposed filter performs its function property. © 2006 IEEE.
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    Electronically tunable floating resistor
    (2004-11-01)
    Pawarangkoon, P.
    ;
    Kiranon, W.
    A new design for an electronically tunable floating resistor is proposed. The proposed circuit can be realized as a positive or negative resistor without changing the circuit topology, and can be tuned electronically. Simulation results are obtained to show adequate agreement with theory.
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    Floating inductance simulation based on current conveyors
    (1997-10-09)
    Kiranon, W.
    ;
    Pawarangkoon, P.
    A basic floating inductance simulation circuit with grounded capacitance using only noninverting second-generation current conveyors as active elements is introduced. The circuit is modified by using current controlled conveyors, yielding electronically tunable inductances. Simulation results are also presented.