Tooprakai, Sirapop

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An electrostatic discharge free bootstrapped BiCMOS inverter circuit based on parasitic diode
(2008-12-01)
Tooprakai, Siraphop
;
Dejhan, Kobchai
Electrostatic discharge (ESD) free bootstrapped BiCMOS inverter circuit is proposed. The proposed driver circuit uses the bootstrapped technique; the transistor base voltage is higher than the supply voltage. The input of circuit is arranged to protect the electrostatic discharge problem, and the output waveform is able to have full swing. The proposed circuit consumes low power with small delay time. The transistors in the circuit operate with high performance and efficiency. © 2008 World Scientific Publishing Company.
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Current-Mode Active Filter Using EX-CCCII
(2024-06-01)
Kumngern, Montree
;
Khateb, Fabian
;
Kulej, Tomasz
;
Tooprakai, Siraphop
This paper presents a novel multiple-input and multiple-output current-mode universal analog filter with electronic tuning capability. The proposed circuit uses a single second-generation current-controlled current conveyor with extra-X terminals (EX-CCCII) and two grounded capacitors. The filter can offer five standard filtering functions, namely low-pass, high-pass, band-pass, band-stop, all-pass responses, in the same circuit without changing the internal configuration of the filter by selecting appropriate input and output signals. To obtain the five standard filtering functions, inverted input signal and input matching conditions are absent. The natural frequency of all filter responses can be electronically controlled. The proposed circuit was simulated by SPICE using 0.18 μm CMOS process from Taiwan Semiconductor Manufacturing Company (TSMC). The results of experiments using the integrated circuit operational amplifier AD844 confirm the functionality of the new filter.
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Multi-input Memristor Rationed Logic Full Adder Circuit for Efficient Processing Time
(2022-01-01)
Yamtim, Suparlerk
;
Tooprakai, Siraphop
This research proposes a multi-input memristor rationed logic (MRL) 1-bit full adder circuit as an alternative to conventional multi-stage MRL full adders. The proposed multi-input 1-bit full adder circuit consisted of 25 memristors without CMOS transistor. Ripple carry adder was utilized to realize multi-input MRL 8-bit full adder circuit by cascading eight blocks of multi-input MRL 1-bit full adder. The advantages of the multi-input MRL 8-bit full adder include straightforwardness, compactness, and improved delay time. Simulations were carried out by using LTspice simulator and results compared with multi-stage full adders. The multi-input MRL 8-bit full adder circuit achieved higher processing-time efficiency and thereby holds great potential as an alternative to multi-stage full adders. The novelty of this research lies in the use of multi-input MRL technique to realize full adder circuits that effectively mitigate voltage degradation and improve delay time.
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Development of wireless device prototype for measurement of rumen pH and temperature continuously in cattle
(2023-01-01)
Prasomsri, Piyanat
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Tudsorn, Apirak
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Leklerdsiriwong, Aekaluck
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Inchaisri, Chaidate
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Tooprakai, Siraphop
This study aims to develop a prototype rumen pH and rumen temperature measuring device for continuous measurement. The benefit is for the monitoring and early diagnosis of metabolic diseases in cattle, especially rumen acidosis and subacute ruminal acidosis. The developed prototype device was approximately 50 millimeters in diameter, 145 millimeters in length and weighed 400 grams. The outer structure of the prototype was made from abs plastic made by a 3D printer, while the internal device contained pH and temperature sensors, a microcontroller and battery. The prototype was placed in the ventral sac of the rumen of fistulated cattle for three days to test the transfer of pH and temperature data. It was found that the pH drifted over time while the temperature remained stable. The pH and temperature signals showed a fast response after feeding. The rumen pH and rumen temperature measured with the prototype were 5.3 - 7.0 and 37.25 - 38.75, respectively. The pH drift over 48 and 72 hours was around 0.15 and 0.28, respectively.
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EX-CCCII with Controlled Current Gain and Its Applications
(2026-04-01)
Tooprakai, Siraphop
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Khateb, Fabian
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Kulej, Tomasz
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Nonthaputha, Thanat
;
Vavra, Jiri
This paper presents a novel extra-X second-generation current-controlled conveyor (EX-CCCII) with controllable current gain. Unlike the conventional EX-CCCII, the proposed EX-CCCII provides a controllable current gain between the (Formula presented.) - and (Formula presented.) -terminals. To demonstrate the advantages of the EX-CCCII with the controllable current gain, the proposed EX-CCCII is employed to realize a universal current-mode filter and a three-phase current-mode oscillator. The universal filter can realize five standard filtering responses (low-pass, high-pass, band-pass, band-stop, and all-pass) using the same topology. The current gains of these filters can be controlled through the current gain of the EX-CCCII, while the natural frequency of the universal filter can be electronically tuned via the intrinsic resistance at the x-terminal. When the proposed EX-CCCII is used to implement the three-phase oscillator, the condition of oscillation can be adjusted through the current gain of the EX-CCCII, whereas the oscillation frequency can be tuned using the parasitic resistance of the x-terminals. The proposed EX-CCCII and its applications were verified through SPICE simulations using the transistor model parameters NR100N (NPN) and PR100N (PNP) of the bipolar array ALA400-CBIC-R from AT&T to confirm the functionality and feasibility of the proposed topologies. Furthermore, experimental verification of the EX-CCCII and its integration into a three-phase oscillator further substantiates the proposed concept and demonstrates its practical viability.

Tooprakai, Sirapop

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