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    Circular Object Sorting Machine with LabVIEW Software Control
    (2024-01-01)
    Mongkolwai, Pratya
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    Satansup, Jetsdaporn
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    Dumawipata, Teerasilapa
    ;
    Nakroungsri, Teerapat
    ;
    Laotuy, Monthathip
    This article describes a project to construct a circular object-sorting machine through the application of image-processing techniques. For the acquisition, processing, and transmission of data, LabVIEW (Laboratory Virtual Instrument Engineering Workbench) software is utilized. The operation of the sorting device is controlled by an Arduino microcontroller board, which is the Arduino Mega 2560. The project aims to efficiently separate circular objects by extracting color information, size measurements, and quantity data through image processing. The experimental results successfully demonstrate the sorting of circular objects and display color values, size measurements, and the number of sorted objects on an efficient LCD screen. The integration of LabVIEW and Arduino provides an effective solution for circular object sorting, aligning with the theoretical principles presented in the project.
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    Floating Inductance Simulator with Electronic Tuning Property Using only Active Elements
    (2023-01-01)
    Roongmuanpha, Natchanai
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    Mongkolwai, Pratya
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    Pukkalanun, Tattaya
    ;
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    This paper discusses the active-only electronically tunable floating lossless inductance simulator, which uses a single fully balanced-voltage differencing buffered amplifier (FB-VDBA) and one operational amplifier (OA). For this implementation, only integrated circuit packages with no external passive components are utilized. The synthetic equivalent inductance value is electronically adjustable via the transconductance gain of the FB-VDBA. Non-idealities of the active element have produced their effects. Using PSPICE with TSMC 0.25-mum CMOS parameter and the LM741 type OA, the performance of the proposed circuit and its application as a second-order voltage-mode lowpass filter is demonstrated. The numerical simulations closely matched the theoretical results.
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    Triple-input single-output electronically controlled voltage-mode biquadratic filter
    (2019-07-01)
    Roongmuanpha, Natchanai
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    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    This article presents the possibility of realizing a voltage-mode biquadratic filter having with three input terminals and single output terminal. The circuit employing only two voltage differencing gain amplifiers (VDGAs) together with two capacitors can realize all the five standard biquadratic filter functions at a single low-impedance-output terminal. It also provides orthogonal current tuning of the natural angular frequency (ω<inf>o</inf>) and the quality factor (Q), and has low active and passive element sensitivities. To confirm the theory, simulation results using PSPICE software are accomplished.
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    CFOA-based single resistance controlled quadrature oscillator
    (2008-12-01)
    Mongkolwai, Pratya
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    Pukkalanun, Tattaya
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    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    This paper presents a new single-resistance-controlled (SRC) sinusoidal quadrature oscillator with reduce number of passive elements using only two current-feedback operational amplifiers (CFOAs). The proposed oscillator configuration comprising two CFOAs, three resistors and two capacitors provides two sinusoidal voltage outputs in phase quadrature. The circuit has the advantage of independent control of the condition of oscillation and the oscillation frequency through a single resistor. In addition, both proposed circuit configurations have good active and passive sensitivity performance. PSPICE simulation results based on commercially available AD844-type CFOAs are also included, showing the excellent performance of the proposed oscillator configuration. © 2008 SICE.
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    Cascadable current-mode multifunction filter with two inputs and three outputs using CDTAs
    (2007-12-01)
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    ;
    Surakampontorn, Wanlop
    The current-controlled current-mode universal filter with two inputs and three outputs using current differencing transconductance amplifiers (CDTAs) as active components is presented. The proposed circuit configuration consisting of only three CDTAs and two grounded capacitors exhibits low-input and high-output impedances, which is advantageous from an integration point of view and is important for easy cascading in the current-mode operations. By properly connecting the input and output terminals, the filter can simultaneously realize all the standard filter functions, namely lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP), without any component matching conditions. The natural angular frequency (ω<inf>o</inf>) and the bandwidth (ω<inf>o</inf>/Q) of the proposed filters can be electronically controlled, thanks to the tunability properties of the CDTAs. All the passive and active sensitivities are low. SPICE simulation results are included to confirm the theory. ©2007 IEEE.
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    Cascadable current-controlled current-mode multifunction filter using CDTAs
    (2007-12-01)
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    ;
    Surakampontorn, Wanlop
    The cascadable current-controlled current-mode multifunction filter with three inputs and one output using current differencing transconductance amplifiers (CDTAs) as active components is presented. The proposed configuration comprising only three CDTAs and two grounded capacitors provides low-input and high-output impedances, which is advantageous from an integration point of view and is important for easy cascading in the current-mode operations. By properly joining the input and output terminals, the circuit can simultaneously realize all the standard filter functions, namely lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP), without any component matching conditions. The natural angular frequency (ω<inf>0</inf>) and the bandwidth (ω<inf>0</inf>/Q) of the proposed filters can be electronically controlled, thanks to the tunability properties of the CDTAs. All the passive and active sensitivities are low. SPICE simulation results are included to confirm the theory. © 2007 IEEE.
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    Low-voltage current differencing buffered amplifier using only NMOS transistors
    (2007-12-01)
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    ;
    Surakampontorn, Wanlop
    A circuit realization of a current differencing buffered amplifier (CDBA) in low-voltage operation is presented. The scheme is through the modification of a low-input resistance CCII+ and the proposed CDBA can operate with the minimum supply voltage of ±1.25V. In order that the signal path consists of only NMOS transistors, a negative current mirror using NMOS transistors is employed. With standard 0.5-gμm CMOS process parameters, PSPICE simulation results show that the proposed CDBA provides the terminal resistances of r <inf>n</inf>≅r<inf>p</inf>≅r<inf>w</inf>≅13 Ω, r <inf>z</inf>≅290 kΩ, and f<inf>-3dB</inf> ≅500 MHz. © 2007 IEEE.
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    Multiple-input single-output current-mode multifunction filter using current differencing transconductance amplifiers
    (2007-04-02)
    Tangsrirat, Worapong
    ;
    Dumawipata, Teerasilapa
    ;
    Surakampontorn, Wanlop
    A novel current-controlled multiple-input single-output current-mode universal filter employing current differencing transconductance amplifiers (CDTAs) as active elements is described. The proposed circuit offers the following attractive features: employment of the minimum number of active and passive components; simultaneous realization of all the standard filtering functions; independent current-control of the parameters ω<inf>o</inf> and ω<inf>o</inf> / Q; no requirement of component matching conditions; employment of only two grounded passive capacitors which is suitable for integrated circuit (IC) implementation; and low passive and active sensitivities. PSPICE simulation results are given to verify the theoretical analysis. An example application using the proposed circuit in cascade realization of the high-order current-mode filter is also presented. © 2006 Elsevier GmbH. All rights reserved.
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    TISO cascadable current-mode multifunction filter employing current differencing transconductance amplifiers
    (2006-12-01)
    Tanjaroen, Wason
    ;
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    A circuit realization of a current-mode multifunction filter with three inputs and one output employing current differencing transconductance amplifiers (CDTAs) as active components is presented in this paper. The proposed circuit employs only three CDTAs and two grounded capacitors and exhibit low-input and high-output impedances, which is very suitable for an integrated circuit implementation and easy cascading in the current-mode operations. By properly selecting the input current terminals, the proposed filter can realize all standard biquadratic functions, i.e., the lowpass (LP), highpass (HP), bandpass (BP), bandstop (BS) and allpass (AP) filtering functions without changing the circuit configuration. The natural frequency (ω<inf>0</inf>) and the bandwidth (ω<inf>0</inf>Q) of the proposed filter can electronically be tuned by controlling the bias current of the CDTA. The filter also provides the low active and passive sensitivities. Simulation results with PSPICE are used to confirm the presented theory. © 2006 ICASE.
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    Current-mode universal filter with four inputs and one output using CDTAs
    (2006-12-01)
    Dumawipata, Teerasilapa
    ;
    Tangsrirat, Worapong
    ;
    Surakampontorn, Wanlop
    A current-controlled multiple-input single-output current-mode universal filter employing current differencing transconductance amplifiers (CDTAs) as active elements is described. The proposed circuit offers the following attractive features: employment the minimum number of active and passive components; simultaneous realization of all the standard filtering functions; independent current-control of the parameters ω<inf>0</inf> and ω<inf>0</inf>/Q; no requirement of component matching conditions; employment of only two grounded passive capacitors which is suitable for integrated circuit (IC) implementation; and low passive and active sensitivities. ©2006 IEEE.