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Author: search.filters.author.Isoguchi, Hiroshi

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    Resistive sensor interface circuits using operational conveyor and operational amplifier
    (2012-03-01)
    Julsereewong, Amphawan
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    Julsereewong, Prasit
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    Rungkhum, Tipparat
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    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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    Self-statable integral type astable multivibrator using CMOS-XOR/XNOR gates
    (2012-01-01)
    Sasaki, Hirotoshi
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    Isoguchi, Hiroshi
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    Yahara, Mitsutoshi
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    Fujimoto, Kuniaki
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    Julsereewong, Amphawan
    The astable multivibrator of the integral type operation using 2 CMOS-XOR/XNOR gates doesn't oscillate only by the power supply's being turned on. On the other hand, the proposed astable multivibrator of the integral type operation by 3CMOS-XOR/XNOR gates oscillates surely when the power supply is turned on. © 2012 The Institute of Electrical Engineers of Japan.
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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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    A study on differential type monostable multivibrator using CMOS-XOR/XNOR gate
    (2011-01-01)
    Sasaki, Hirotoshi
    ;
    Julsereewong, Amphawan
    ;
    Isoguchi, Hiroshi
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    Yahara, Mitsutoshi
    ;
    Fujimoto, Kuniaki
    In the differential type monostabel multivibirator using CMOS-XOR/XNOR gates, there is a circuit configuration that the operation of two elements becomes the same in stable sate and the metastable state. And, these circuits has the up mode and down mode operations. Furthermore, the metastable state is not influenced trigger repetition rate, and it is shown by a simple formula expression. © 2011 The Institute of Electrical Engineers of Japan.
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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.
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    Simple monostable multivibrators using EX-OR/EX-NOR gates
    (2010-01-01)
    Riewruja, Vanchai
    ;
    Julsereewong, Amphawan
    ;
    Isoguchi, Hiroshi
    ;
    Sasaki, Hirofumi
    Two simple differential-type monostable multivibrators are proposed and demonstrated in this letter, where the first configuration operated under positive triggering mode utilizes EX-OR gates and the second configuration operated under negative triggering mode employs EX-NOR gates. Both realization methods make use of CMOS logic gates connected with a few passive elements to form as switching circuits. Experimental results show that the ranges of the output pulse widths are from several microseconds to milliseconds. © 2010 The Institute of Electrical Engineers of Japan.