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Author: search.filters.author.Surakampontorn, W.End date: 1999

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    Sinusoidal frequency doubler and full-wave rectifier using translinear current conveyor
    (1998-10-29)
    Surakampontorn, W.
    ;
    Anuntahirunrat, K.
    ;
    Riewruja, V.
    A simple circuit design technique for realising both a sinusoidal frequency doubler and a full-wave rectifier, employing a translinear current conveyor and current mirrors as active circuit elements, is proposed. The implementation method uses the inherited translinear loop of the translinear current conveyor to perform frequency doubling and rectification. The performance of the scheme is demonstrated by PSPICE simulations.
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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.
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    An accurate CMOS differential voltage-to-current converter
    (1994-01-01)
    Kumwachara, K.
    ;
    Surakampontorn, W.
    ;
    Riewruja, V.
    ;
    Surawatpunya, C.
    A technique for implementing a differential voltage-to-current converter that is suitable for fabrication in CMOS technology is presented. The transconductance of the converter is determined by an external resistor. Very linear and accurate transconductance is obtained with a conversion error of 0-012% for an external resistance of 25 Ω. Simulation results are given to show the linearity and accuracy of the conversion circuit. The voltage-to-current converter is a versatile building block and can be applied as a current conveyor, a floating inductance, a floating negative impedance converter and an instrumentation amplifier. © 1994 Taylor & Francis Ltd.
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    Cmos floating voltage-controlled negative resistor
    (1992-07-16)
    Surakampontorn, W.
    A circuit technique for realising a floating voltage-controlled negative resistor that is suitable for fabrication in CMOS technology is presented. The negative resistor action is achieved through nonlinearity cancellation of the currents of MOS transistors in saturation. © 1992, The Institution of Electrical Engineers. All rights reserved.
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    CMOS-based electronically tunable current conveyor
    (1992-07-02)
    Surakampontorn, W.
    ;
    Kumwachara, K.
    A CMOS-based small signal current amplifier, which is constructed from two current-squaring circuits with improved dynamic range, is introduced. A circuit technique for realising an integrable electronically tunable current conveyor that is designed around the current amplifier is proposed. © 1992, The Institution of Electrical Engineers. All rights reserved.
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    Full-wave rectifiers using operational amplifiers and resistors
    (1989-01-01)
    Surakampontorn, W.
    ;
    Jutaviriya, S.
    ;
    Apajinda, T.
    An alternative scheme for realizing a Full-wave rectifier is described in this note. The realization method uses the inherited class AB complementary stage of a general-purpose operational amplifier (op amp) as a means to perform a rectifier action. Therefore, the rectifier circuits comprise only op amps and resistors. © 1989 Taylor & Francis Ltd.
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    Integrable Electronically Tunable Current Conveyors
    (1988-01-01)
    Surakampontorn, W.
    ;
    Thitimajshima, P.
    A generalised current conveyor, termed an electronically tunable second-generation current conveyor (ECCII), whose current-transfer ratio can be varied by electronic means, is introduced. A method is proposed for realising ECCII in monolithic integrated form providing both a positive and a negative ECCII in the same circuit. Experimental and simulation results demonstrating the circuit performance are included. Some simple applications which show that their circuit property can be varied by electronic means are also presented. © 1988, The Institution of Electrical Engineers. All rights reserved.
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    Dual translinear sinusoidal frequency doubler and full-wave rectifier
    (1988-01-01)
    Surakampontorn, W.
    ;
    Jutaviriya, S.
    ;
    Apajinda, T.
    In this article, an integrable circuit principle which can be employed to realize both a sinusoidal frequency doubler and a full-wave rectifier is presented. The realization method makes use of a dual translinear characteristic of bipolar junction transistors. Two implementation circuits are proposed and their performance are demonstrated by experimental results. © 1988 Taylor & Francis Group, LLC.
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    Integrable wide-dynamic-range negative resistance circuits
    (1985-05-23)
    Surakampontorn, W.
    A technique for realising grounded and floating negative resistances in monolithic integrated form is described. The conversion circuit will linearly and accurately convert a given resistance to a corresponding negative resistance with exactly the same magnitude. The dynamic range of the converted resistance is approximately | V<inf>cc</inf> — 3V<inf>BE</inf>|. © 1985, The Institution of Electrical Engineers. All rights reserved.
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    Electronically variable general-resistance circuit
    (1986-01-01)
    Surakampontorn, W.
    ;
    Junnapiya, S.
    A general-resistance conversion circuit that can transform a given resistance into a positive and a negative resistance is proposed. The converted resistance is floating and its magnitude can be varied by electronic means. The circuit can be used in both a voltage-controlled mode and a current-controlled mode. Since the lateral pnp transistors are not placed in the signal paths, the circuit has a wide bandwidth. © 1986 Taylor & Francis Group, LLC.