Lerkvaranyu, Somkiat
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Preferred name
Lerkvaranyu, Somkiat
Alternative Name
Lerkvaranyu, S.
Main Affiliation
Email
somkiat.le@kmitl.ac.th
8 results
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Item type:Publication, The variation of critical frequency of E layer over Chumphon, Thailand(2013-12-09); ; ; Noppanakeepong, SuthichaiIn 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A Wien-type oscillator using ECCII(2017-01-18); 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A square-wave generator using ECCII(2017-07-02); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Square/triangular wave generator using single bulk-driven FDCCII(2019-07-01); 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Voltage/current-mode universal filter using single FDCCII(2019-07-01); 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, CMOS sample-and-hold circuit using current conveyor analogue switch(2017-01-18); This paper presents a new CMOS sample-and-hold (S/H) circuit employing one second-generation current conveyor (CCII), one resistor and one capacitor. Unlike, conventional S/H circuits, the proposed S/H circuit is absent from MOS switches. The proposed S/H circuit uses CCII to work as analog switch (CCAS) which high speed on-off status of switch and without buffer circuit can be obtained. The status on-off of switch is controlled by bias current. This bias current is sampling pulse that used for sampling input signal. The proposed S/H circuit is suitable for low-power and high accuracy for signal processing applications. The simulation results are used to confirm the workability of the proposed circuit. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, TEC prediction with neural network for equatorial latitude station in Thailand(2012-01-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design and implement of GPON-FTTH network for residential condominium(2017-09-05); This paper presents design and implement of fiber to the home (FTTH) for residential condominium based on Gigabit-capable passive optical network (GPON) ITU-T G.984 standard in order to achieve the maximum 320 subscribers and support high bandwidth for triple play service more efficiently. The proposed design complies both with power budget and rise time budget standard. Finally, the proposed design achieves the maximum 320 subscribers, average bandwidth per subscriber at 62.2 Mbps for downstream and 31.1 Mbps for upstream, power margin is above 0 and rise time budget is below 70 percent of an NRZ bit period.