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Author: search.filters.author.Kiranon, Wiwat

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    A modified bipolar translinear cell with improved linear range and its applications
    (2012-12-28)
    Merz, Naruemo
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    Kiranon, Wiwat
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    Wongtachathum, Chariya
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    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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    Architecture for instantaneous frequency and amplitude detection
    (2011-03-01)
    Lorsawatsiri, Anuree
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    Kiranon, Wiwat
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    Wongtaychatham, Chariya
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    Sangpisit, Wipa
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    Wardkein, Paramote
    This paper presents a new architecture to detect the frequency and amplitude of sinusoidal signals. The proposed architecture employs merely differentiators and analog computational units to gain an accurate and instantaneous response. The detected output of the frequency measuring module is linear with frequencies and insensitive to the peak amplitude of the input signal, and vice versa. Moreover, the sensitivity (gain) of frequency detection module and that of amplitude detection module are orthogonally adjusted. The simulation results are then given to verify the theoretical analyses. The results also include various set of simulation aiming to give substantive measures of satisfactory performance of the proposed method. © 2010 Elsevier GmbH. All rights reserved.
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    Current-mode squaring, square-rooting and vector summation circuits
    (2010-05-01)
    Petchakit, Wijittra
    ;
    Lorsawatsiri, Anuree
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    Kiranon, Wiwat
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    Wongtaychathum, Chariya
    ;
    Wardkein, Paramote
    This paper presents new current-mode squaring, square-rooting and vector summation circuits based on the second generation current controlled conveyor (CCCII). Consisting of only CCCIIs as active elements not requiring any external passive elements, all of the proposed circuits are capable of high frequency operation and well suited for IC fabrication. Moreover, the circuits performances are insensitive to temperature and their gains can be easily adjusted by varying the input bias current of CCCII. Finally, the simulation results of the proposed squaring, square-rooting and a two-input vector summation circuits are depicted to confirm the theoretical analysis. © 2009 Elsevier GmbH. All rights reserved.
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    Low cost RISC implementation of intelligent ultra fast charger for Ni-Cd battery
    (2008-02-01)
    Petchjatuporn, Panom
    ;
    Sirisuk, Phaophak
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    Khaehintung, Noppadol
    ;
    Sunat, Khamron
    ;
    Wicheanchote, Phinyo
    This paper presents a low cost reduced instruction set computer (RISC) implementation of an intelligent ultra fast charger for a nickel-cadmium (Ni-Cd) battery. The charger employs a genetic algorithm (GA) trained generalized regression neural network (GRNN) as a key to ultra fast charging while avoiding battery damage. The tradeoff between mean square error (MSE) and the computational burden of the GRNN is addressed. Besides, an efficient technique is proposed for estimation of a radial basis function (RBF) in the GRNN. Hardware realization based upon the techniques is discussed. Experimental results with commercial Ni-Cd batteries reveal that while the proposed charger significantly reduces the charging time, it scarcely deteriorates the battery energy storage capability when compared with the conventional charger. © 2007 Elsevier Ltd. All rights reserved.
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    A novel high Q-bandpass filter employing a few grounded passive components
    (2005-12-01)
    Tongkulboriboon, Seangrawee
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    Petchakit, Wijittra
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    Pawarangkoon, Prajuab
    ;
    Kiranon, Wiwat
    This paper proposes a novel current mode high Q bandpass filter with electronically tunable features based on second generation current controlled conveyor (CCCII). The configuration of the proposed circuit Is simple and very attractive for monolithic circuits owing to using a few grounded passive components. The center frequency and pole-Q can be Independently adjusted via dc bias currents of CCCIIs. The proposed filter Is verified by SPICE simulations and the results are given In order to confirm the validity of the proposed circuits. © 2005 IEEE.
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    A solar-powered battery charger with neural network maximum power point tracking implemented on a low-cost PIC-microcontroller
    (2005-01-01)
    Petchjatuporn, Panom
    ;
    Sirisuk, Phaophak
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    Ngamkham, Wannaya
    ;
    Kiranon, Wiwat
    ;
    Khaehintung, Noppadol
    This paper presents the development of a maximum power point tracking algorithm using an artificial neural network for a solar power system. By applying a three layers neural network and some simple activation functions, the maximum power point of a solar array can be efficiently tracked. The tracking algorithm integrated with a solar-powered battery charging system has been successfully implemented on a low-cost PIC16F876 RISC-microcontroller without external sensor unit requirement. The experimental results with a commercial solar array show that the proposed algorithm outperforms the conventional controller in terms of tracking speed and mitigation of fluctuation output power in steady state operation. The overall system efficiency is well above 90%.
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    Electronically current mode all-pass filter with only one grounded capacitor
    (2005-01-01)
    Tongkulboriboon, Seangrawee
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    Pawarangkoon, Prajuab
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    Petchakit, Wijittra
    ;
    Kiranon, Wiwat
    A novel current mode first order all-pass filter with electronically tunable feature based on second generation current controlled conveyor (CCCII) is presented. The configuration of the proposed circuit is simple and very attractive for monolithic circuits owing to using only one grounded capacitor and two CCCIIs. Phase shift characteristic of the current mode all-pass filter can be controlled by dc bias currents of the CCCIIs. The proposed circuit is verified by SPICE simulation and applied in current mode quadrature oscillator realization. The results from simulations are included in order to confirm the validity of the proposed circuits.
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    Electronically tunable floating resistor
    (2004-12-01)
    Pawarangkoon, Prajuab
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    Intaudom, Vuttikai
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    Kiranon, Wiwat
    A new design for an electronically tunable floating resistor is proposed The proposed circuit can be realized a positive or negative resistor without changing the circuit topology. Also, the resistance values of the circuit can be tuned electronically. The proposed circuit is based on only one second-generation current controlled conveyor, which is easy to be fabricated in IC technology. Simulation results are obtained to show adequate agreement with theory. © 2004IEEE.
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    Four-quadrant current-mode divider based on current conveyors
    (2004-12-01)
    Pawarangkoon, Prajuab
    ;
    Intaudom, Vuttikai
    ;
    Kiranon, Wiwat
    In this paper, a four-quadrant current-mode divider circuit is proposed The circuit employs only the current conveyors as active circuit elements and does not require external passive elements. It is therefore suitable for IC implementation. The circuit offers endurance on temperature variations. PSPICE simulation results are used to demonstrate the performance and accuracy of the proposed circuit. © 2004IEEE.
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    An arbitrary power law device based on integrators
    (2000-12-01)
    Kiranon, Wiwat
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    Loescharataramdee, Chariya
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    Petchakit, Wijittra
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    Sangpisit, Wipa
    A new simple arbitrary power law device implemented from integrators along with the sample-and-hold technique is presented. The number of the integrators indicates the index of the power law. Part of the integrators determine an appropriate time interval to be used to control the sample-and-hold circuit to extract the correct output. To test the validity and value of the proposed method, numerous power law functions have been experimented. The experimental results show very close agreement with the theoretical analysis. In addition, the measurement output, possibly as large as a few volts, is obtained with extreme precision. © 2000 IEEE.