Lerkvaranyu, Somkiat

Preferred name

Alternative Name

Lerkvaranyu, S.

Main Affiliation

School of Engineering

somkiat.le@kmitl.ac.th

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The variation of critical frequency of E layer over Chumphon, Thailand
(2013-12-09)
Wongcharoen, Poramintra
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Kenpankho, Prasert
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Sepsirisuk, Kasemsuk
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Supnithi, Pornchai
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Noppanakeepong, Suthichai
In this research paper presents the observed critical frequency of E layer (foE) over Chumphon, Thailand which is located at nearly the magnetic equator (lat. 10.72° long. 99.37° dip. 3°) during September 2004 to August 2005. The foE is one of essential parameters in the International Reference Ionsphere (IRI) model. We investigate the variation of the observed foE by comparing to the Sun spot number, ionospheric index, and 10.7 cm. flux. Due to essentially of accurate IRI model can be used to applied in communication such as it may be implied tendency of phenomena in E layer effect on high frequency communication over Chumphon, Thailand. © 2013 IEEE.
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Wide-band CMOS precision rectifier circuit
(2008-12-01)
Kumngern, Montree
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Lerkvaranyu, Somkiat
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Dejhan, Kobchai
A wide-band precision CMOS rectifier, which is very suitable for integrated circuit implementation, is presented. The proposed circuit consists of a voltage-to-current converter, two precision rectifiers and four current-to-voltage converters that performs positive half-wave, negative half-wave, positive full-wave and a negative full-wave rectifications into a single circuit. The precision current-mode rectifier with operating in class-AB is employed to provide the high-frequency capability of the circuit. The circuit exhibits a very versatility, high operating frequency and good temperature stability The proposed configuration is very suitable for integrated circuit implementation both CMOS and bipolar technologies. The simulation results in CMOS technology demonstrate the performance of the proposed circuit. © 2008 IEEE.
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A Wien-type oscillator using ECCII
(2017-01-18)
Suksaibul, Pichai
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Lerkvaranyu, Somkiat
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Kumngern, Montree
This paper presents a new Wien-type oscillator using electronically tunable current conveyors (ECCII). Unlike previous Wien-type oscillators, the condition of oscillation of the proposed circuit can be controlled electronically using the current gain of ECCII. The structure is realized using grounded resistor which is easy for developing as a voltage-controlled oscillator. The condition and frequency of oscillations can be controlled orthogonally. PSPICE simulation results are given to confirm the presented theory.
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A square-wave generator using ECCII
(2017-07-02)
Kumngern, Montree
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Suksaibul, Pichai
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Lerkvaranyu, Somkiat
This paper presents a new square-wave generator using electronically tunable second-generation current conveyors (ECCII). The proposed circuit employs one ECCII, two resistors and one resistor. Unlike previous works, oscillating condition can be given by current gain of ECCII and the output frequency can be controlled by changing resistor. Both voltage and current signals can be obtained into a single topology. The proposed circuit is simulated using PSPICE simulators to confirm the workability of the circuit.
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M-QAM demodulation in an OFDM system with RBF neural network
(2004-12-01)
Lerkvaranyu, Somkiat
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Dejhan, Kobchai
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Miyanaga, Yoshikazu
This paper proposes a method which improves the M-QAM demodulation in the orthogonal frequency division multiplexing (OFDM). The OFDM has several advantages, i.e., the possibility of a simple equalization of the received signal. However, the disadvantages are also considered as the phase ambiguity due to intercarrier-interference (ICI) which causes the significant degradation on the performance of an OFDM system. The proposed method is a radial basis function (RBF) neural network which learns the characteristic of M-QAM signal constellation before reconstructing the correct signal constellation under noisy circumstances. The hybrid learning process is used to train the RBF network. The hidden layer is trained by the hard c means clustering. The supervised learning with given input-output pairs are used to train the output layer. This paper assumes an additive white Gaussian noise (AWGN) channel. The simulation results of the random symbol generations show that the probability of errors closes to ideal with the proposed method. OFDM, QAM demodulation, Self-organized clustering.
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Square/triangular wave generator using single bulk-driven FDCCII
(2019-07-01)
Torteanchai, Usa
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Manman, Somsak
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Kumngern, Montree
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Lerkvaranyu, Somkiat
This paper presents a new square/triangular wave generator based on ultra-low voltage fully differential second generation current conveyor (FDCCII). The circuit is composed base on Schmitt trigger and integrator circuits that employs one FDCCII, four resistors and one capacitor. The circuit can generate both square and triangular output waveforms into one topology. The performance of proposed circuit is confirmed using PSPICE simulations with a standard 0.18 \mum CMOS process and with a 0.5 V supply.
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Voltage/current-mode universal filter using single FDCCII
(2019-07-01)
Jongchanachavawat, Wirote
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Kumngern, Montree
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Lerkvaranyu, Somkiat
This paper presents a new voltage/current-mode universal filter using single fully differential second generation current conveyor (FDCCII). The topology can be realized both voltage and current-mode filters such as low-pass, band-pass, high-pass, band-stop and all-pass filtering functions without changing circuit topology. The circuit employs one FDCCII, two capacitors and two resistors. The performance of proposed circuit is confirmed using PSPICE simulations with a standard 0.35 \mum CMOS process.
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0.3 v Fully Differential Current Conveyor Using MIBD-DT MOST technique
(2022-01-01)
Kumngern, Montree
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Torteanchai, Usa
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Wongprommoon, Natapong
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Jongchanachavawat, Wirote
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Tooprakai, Siraphop
This paper presents a new fully differential second-generation current conveyor (FDCCII) using multiple-input bulk-driven dynamic threshold voltage MOS transistor (MIBD-DT MOST) technique. This FDCCII, the MOST techniques such as the multiple-input (MI), bulk-driven (BD) and dynamic threshold voltage (DT) have been used. The MIBD can be reduced the number of differential pair of FDCCII and the DT-MOST technique can be reduced the power supply requirement. Thus, the proposed FDCCII is capable to working with a supply voltage of 0.3 V and it consumes a 0.132 uW of power dissipation. The simulations were performed with SPICE program using the 0.18 um CMOS technology. To prove the workability of the new circuit, the proposed FDCCII has been used to realize universal filter.
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Multiple-Input Multiple-Output Universal Filter Using DDTAs
(2022-01-01)
Suksaibul, Pichai
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Torteanchai, Usa
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Manman, Somsak
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Jongchanachavawat, Wirote
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Kumngern, Montree
This paper presents a multiple-input multiple-output universal biquadratic filter using differential difference transconductance amplifiers. The variant filtering responses can be obtained by appropriately applying input signals and appropriately choosing output terminals. The voltage-mode filter possesses both high-input and low-output impedances. The proposed filter provides five standard filtering responses. The natural frequency can be controlled electronically, and the quality factor can be controlled orthogonally. The performance of the proposed filter is confirmed using PSPICE simulation based on 0.18 µm CMOS technology from TSMC.
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Automatic indexing system for atmospheric laser radar data
(2002-01-01)
Lerkvaranyu, S.
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Miyanaga, Y.
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Dejhan, K.
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Cheevasuvit, F.
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Mizutani, K.
The purpose of this paper is to design a new method for an automatic indexing system with unsupervised conditions. In this paper, the method of a self-organizing clustering network is adopted. It is used to classify and index a large amount of real atmospheric laser radar data. Initially, the parameters of each cluster will start with random initial values and are adapted with the algorithm. In this paper, six groups are clustered from the given data. It is also shown that some of these indicate quite important atmospheric condition characteristics.

Lerkvaranyu, Somkiat

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