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    A modified bipolar translinear cell with improved linear range and its applications
    (2012-12-28)
    Merz, Naruemo
    ;
    Kiranon, Wiwat
    ;
    Wongtachathum, Chariya
    ;
    Pawarangkoon, Prajuab
    ;
    Narksarp, Wipavan
    This paper presents a technique to extend the linear input voltage range of a sinh mixed translinear cell proposed by Fabre [1]. This technique extends the linear operation range of the circuit by inserting common-anodeconnected pairs into the mixed translinear cell. Then the relationship between the output current and the input voltage is developed to be linear. The transconductance gain can be adjusted electronically while keeping its linearity. The performance of the proposed circuit is verified by mathematical analysis and by SPICE simulations. Finally, applications of the proposed cell in a floating resistor and a CCCII for designing an instrumentation amplifier are presented.
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    Resistive sensor interface circuits using operational conveyor and operational amplifier
    (2012-03-01)
    Julsereewong, Amphawan
    ;
    Julsereewong, Prasit
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    Rungkhum, Tipparat
    ;
    Sasaki, Hirofumi
    ;
    Isoguchi, Hiroshi
    A simple technique based on commercially available devices to implement three interface circuits for both differential resistive sensors and single resistive sensors is presented in this article. Each proposed scheme uses an operational conveyor and an operational amplifier as active elements. Surpassing the previously reported circuits, the proposed circuits provide not only simpler structures but also higher accuracy. Performances of the proposed circuits are verified through computer simulations. © 2012 ICIC International.
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    Noise source impedance measurement in SMPS
    (2011-12-01)
    Tarateeraseth, Vuttipon
    ;
    See, Kye Yak
    ;
    Canavero, Flavio G.
    An accurate measurement method to extract common mode (CM) and differential mode (DM) noise source impedances of a switched-mode power supply (SMPS) under operating condition is presented in this chapter. With a proper pre-measurement calibration process, the proposed method allows extraction of both the CM and the DM noise source impedances with very good accuracy. These noise source impedances come in handy to systematically design an electromagnetic interference filter for a SMPS with minimum hassle. © 2011 Bentham Science Publishers. All rights reserved.
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    Simple linearization technique for remotely measuring resistance changes
    (2011-08-01)
    Julsereewong, Amphawan
    ;
    Julsereewong, Prasit
    ;
    Rungkhum, Tipparat
    ;
    Sasaki, Hirofumi
    ;
    Isoguchi, Hiroshi
    A simple linearization technique for remotely measuring resistance changes of single-element resistive-type sensors is presented in this article. The proposed circuit configuration uses commercially available devices to generate the output voltage, which is linearly proportional to the sensing resistance change. PSPICE simulation results are included to confirm not only the good operation but also the effective lead-resistance compensation of the proposed technique.
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    Interface circuit for single active element resistive sensors
    (2010-10-01)
    Julsereewong, Amphawan
    ;
    Julsereewong, Prasit
    ;
    Rungkhum, Tipparat
    ;
    Sasaki, Hirofumi
    ;
    Isoguchi, Hiroshi
    This article presents an effective method to realize interface circuit for single active element resistive sensors. The realization is composed of op-amp in conjunction with current conveyors. Surpassing the previous circuit using only single current conveyor, the proposed configuration affords significant improvement in accuracy. PSPICE simulation results are used to confirm the performance of the proposed circuit. © 2010 ICIC International.