Prommee, Pipat

Preferred name

Prommee, Pipat

Alternative Name

Prommee, P.

Main Affiliation

School of Engineering

pipat.pr@kmitl.ac.th

Now showing 1 - 10 of 23

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Grounded Capacitive Sensor Readout Using Improved Guard Driving Circuit
(2025-01-01)
Chimnoy, Jirat
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Karawanich, Khunanon
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Prommee, Pipat
A remote capacitive sensor is necessary in hazardous locations such as liquid boilers and chemical facilities. The connection of the capacitive sensor and coaxial cable is integrated with the readout circuit, encompassing intrinsic noise and parasitic capacitance limitations. This work presents a grounded capacitive sensor with an economical architecture incorporating an RC lowpass filter and an enhanced guard driving circuit. The proposed technique effectively achieves minimal parasitic capacitance and reduced noise at the output. The sensor capacitance can be readily calculated by measuring the output signal's amplitude at the cutoff frequency. Both simulation and experimental findings corroborate its efficacy and precision. The capacitance range can be quantified between 1-100 pF with less than 2% relative errors.
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A compact floating and grounded memristor model using single active element
(2022-12-01)
Prasad, Sagar Surendra
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Kumar, Prashant
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Raj, Niranjan
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Sharma, Pankaj Kumar
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Priyadarshini, Bindu
Memristor with defined operational specifications is a challenging task that promotes innovation in emulation circuit modelling. This article presents a single active block based compact memristor emulator architecture which is suitable for both floating and grounded circuit topologies. It effectively operates in incremental/decremental modes in both the configurations. The proposed model utilizes only one Differential Voltage Current Conveyor Transconductance Amplifier (DVCCTA) as an active block along with a few passive components. It discourages the use of extra sub-circuit components like multiple active blocks, summers and multipliers. The circuit is intended to work at ±1 V of dc power supply and has a power consumption of 8.74 mW. The proposed emulator model exhibits all the characteristics of an ideal memristor with an operating frequency of 12.8 MHz. It has wide working voltage range of 50–500 mV. The memristor model is built and simulated using the TSMC 0.18 μm CMOS process parameter. The reliability and effectiveness of the proposed model is verified through non-ideal, Monte-Carlo, process corner, non-volatility and temperature variation analysis. Furthermore, the memristor prototype is constructed on the breadboard using discrete ICs AD844AN and CA3080. The experimental outcome is found in accordance with the simulation. The applicability of the proposed memristor model is verified by implementing a memristor based Schmitt trigger circuit.
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0.5-V High Linear Fully Differential Multiple-Input Bulk-Driven OTA With Effective Self-Embedded CMFB
(2024-01-01)
Khateb, Fabian
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Kulej, Tomasz
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Kumngern, Montree
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Prommee, Pipat
This paper presents a new fully differential multiple-input operational transconductance amplifier (FD MI-OTA) with an effective self-embedded common-mode feedback circuit (CMFB). The circuit employs several design techniques to extend the linearity to the rail-to-rail level, such as a bulk-driven, multiple-input capacitive voltage divider and source degeneration. The circuit uses self-cascode transistors to increase the gain of the OTA from one side and to create a common-mode feedback circuit, needed to control the common-mode output voltage from the other side. Thus, the CMFB is part of the OTA and as a result, its chip area and power consumption remain unchanged. The performance of the proposed circuit was simulated using TSMC s CMOS 0.18 μ m process in the Cadence Virtuoso System Design Platform to validate the performance of the topology. Intensive simulation results based on Monte Carlo and process, voltage, temperature corners were performed to confirm the OTA's performance and the robustness of the CMFB. The circuit operates with a supply voltage of 0.5 V and consumes 17.5nW of power, making it suitable for applications with extremely low voltage supply and low frequency. As an application, a second-order low-pass filter was designed based on the proposed FD MI-OTA.
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OTA-based tunable fractional-order devices for biomedical engineering
(2021-01-01)
Prommee, Pipat
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Pienpichayapong, Peradol
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Manositthichai, Narongsak
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Wongprommoon, Natapong
This research realizes fractional-order devices or constant phase element (CPE) using continued fraction expansion (CFE) and rational function approximation methods. An RC ladder network prototype was realized using CFE based on the Cauer network principle. The RC ladder network and signal flow graph (SFG) were employed to realize the proposed CPE. Voltage gain circuits and voltage-mode integrators were realized by using operational transconductance amplifiers (OTA) and grounded capacitors. The proposed CPE was subsequently synthesized using voltage gain circuits and voltage-mode integrators based on SFG. The proposed CPE could function as fractional-order capacitor and fractional-order inductor. Besides, the CPE could be constructed in arbitrary fractional-orders. The impedance and operation frequency are independently tunable by manipulating OTA bias current. To validate, the proposed fractional-order device was applied to six types of electrical Cole models of skull tissues, and simulation results were compared with the approximation function and theory. The electrical characteristics of the Cole models based on the proposed CPE are comparable to the theoretical characteristics of the Cole model.
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A Four-Scroll Chaotic Generator based on Two Nonlinear Functions
(2022-01-01)
Karawanich, Khunanon
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Kumngern, Montree
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Prommee, Pipat
This paper presents a new three dimensions four-scroll chaotic generator with two unique nonlinear functions. The modified jerk model is utilized with the traditional signum and modified rectangular functions. The proposed system can generate two-scroll and four-scroll attractors by adjusting only one coefficient (k). The fundamental dynamical behaviors of the system are investigated by the bifurcation, Lyapunov spectrum, and Kaplan-Yorke dimension. The one chaotic system can generate double-scroll and complex four-scroll chaotic attractors with variations of a single parameter and without multipliers that are highlighted in this paper. MATLAB carries out the simulation results, and the results confirmed that this is a new three dimensions chaotic jerk model which deserves further detailed investigation.
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High-complex chaotic system based on new nonlinear function and OTA-based circuit realization
(2022-09-01)
Karawanich, Khunanon
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Prommee, Pipat
This research proposes a chaotic system using a new modified rectangular nonlinear function based on the principle of the third-order jerk concept. The dynamic behaviors can be realized by manipulating only one parameter from periodic, non-periodic, single-scroll, and double-scroll attractors. The proposed chaotic system can achieve relatively high-complexity chaotic behavior, as evident in the comparatively high Kaplan-Yorke dimension (D<inf>KY</inf> = 2.43) with the existing jerk systems. The performances of the proposed chaotic system are also computed and simulated through the MATLAB numerical analysis, including scenarios of bifurcations branches, Lyapunov exponents, route to chaos, phase portraits, 0–1 test charts, and Poincaré map. The proposed system analyzes the coexistence of asymmetric or symmetric attractors confirmed with basins of attraction to highlight the presence of multiple attractors, which influence initial conditions. In addition, the system's offset boosting and amplitude control are included. Furthermore, a double-scroll attractor and a four-scroll attractor can also be achieved by placing nonlinear functions at different positions in the third-order system., The circuits of the proposed chaotic systems can be conveniently realized using commercially available operational transconductance amplifiers (OTAs) and capacitors. The performances of the circuit are also proven through the experimental results compared with the numerical results. The experimental results exhibit the ease of construction based on the new nonlinear function and are suitable for applying in the data encryptions.
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Voltage-Mode Elliptic Band-Pass Filter Based on Multiple-Input Transconductor
(2021-01-01)
Prommee, Pipat
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Karawanich, Khunanon
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Khateb, Fabian
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Kulej, Tomasz
This paper presents a new voltage-mode elliptic band-pass filter based on a multiple-input transconductor (MI-OTA). The MI-OTA's structure employs the multiple-input MOS transistor technique that simply enables to increase the number of OTA's inputs without increasing the number of current branches or the differential pairs. The MI-OTA features high linearity over a wide input range with a compact and simple CMOS structure. From the advantage of multiple inputs, it enables to construct the arbitrarily summing and subtracting under the proposed voltage-mode filter design procedure. The filter is designed and simulated in Cadence environment using 0.18 μm TSMC CMOS technology. The filter offers 72.9 dB dynamic range for 2 % total harmonic distortion (THD) for sine input signal of 0.5 Vpp @ 1kHz with voltage supply ± 0.9V. The simulation results of the filter are in agreement with the RLC prototype. The experimental results using commercially available IC are also included to confirm the proposed filter that are in good agreement with the simulation results.
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Low-complexity Chebyshev High-pass Filter based on OTA-C
(2020-07-01)
Wongprommoon, Natapong
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Tiamsuphat, Apinat
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Prommee, Pipat
This work presents a new Chebyshev ladder high-pass filter based on operational transconductance amplifier (OTA) based differentiators. Lossy and Lossless differentiators based on the OTA-C technique are deployed as the main sub-circuits. The Chebyshev ladder high-pass filter is transformed from a low-pass RLC prototype by using the network transformation method. The signal flow graph (SFG) and third-order RLC prototype are used to synthesis the active high-pass filter. The final SFG functions can be directly replaced by OTA-C current-mode differentiators. Due to the proposed structure of the high-pass filter contains only 6 OTA(s) and 3 grounded capacitors that resulting in the low-complexity and low components count. The frequency responses of the proposed filter can be electronically tuned between 200kHz and 8MHz by varying the bias currents (IB) from 3 μ A to 300 μ A. The proposed filter response good agreement with the response of the RLC prototype. PSpice simulation results are carried out to verify the filter performances.
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MIOTA-Based Filters for Noise and Motion Artifact Reductions in Biosignal Acquisition
(2022-01-01)
Khateb, Fabian
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Prommee, Pipat
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Kulej, Tomasz
This paper presents a new low-voltage CMOS structure for operational transconductance amplifier (OTA) exploiting the bulk-driven, the self-cascode and the multiple-input transistor techniques (MI). The multiple-input OTA (MIOTA) circuit operates in subthreshold region using 0.5V supply voltage and offers enhanced linearity. The MIOTA is developed for biopotential signal as well as electrocardiogram (ECG) signal processing circuit and it is exploited to design a 5th-order Chebyshev low-pass and 3rd-order band-pass filters with a dynamic range (DR) of 57.6 dB and 60.4 dB, and nanopower consumption of 50 nW and 60 nW, respectively. Due to the electronic tuning of cut-off frequency, the low-pass and band-pass filters are suitable for random noise and motion artifact noise reductions in biopotential signals. The circuits were designed in Cadence environment using the standard N-well 0.18~\mu TSMC CMOS technology. Intensive post-layout simulation results along with the process, voltage, temperature analysis (PVT) and Monte Carlo (MC) prove the robustness of the design. The chip area of the proposed MIOTA is 0.00725 mm<sup>2</sup>; ( 118~\mu \times 61.5\mu ). Compared with standard OTA the MIOTA offers simplification of filter topology and reduced number of active elements. In order to demonstrate these advantages, the MIOTA-based filter was also build using commercially available OTA LT1228. The experimental results of OTA LT1228 confirm both the filter functionality and the advantages of the proposed MIOTA.
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Low-Cost Capacitive Sensor Front-End Circuit Based on Phase-Locked Technique
(2025-12-15)
Wongprommoon, Natapong
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Chimnoy, Jirat
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Prommee, Pipat
This research presents an efficient front-end circuit for grounded capacitive sensors (GCSs), based on a phase-locked technique. An all-pass filter serves as a phase shifter to obtain the desired 90° phase difference, enabling the sensor capacitance to be calculated from the locked frequency regardless of parasitic capacitances. For long-distance capacitance measurements (remote sensors), the proposed circuit integrates an improved active shield technique, allowing real-time measurements using only a low-cost microcontroller unit (MCU), display, and commercially available electronic components, without the need for expensive or bulky instruments. The design is fully automated and does not require manual adjustments. Simulation and experimental results are consistent and validate the effectiveness of the proposed method. Comparative experiments with standard instruments demonstrate accurate measurement within the 1–500 pF range through shielded cables up to 10 m, while maintaining a maximum nonlinear error (NLE) of only 0.04% full-scale span (FSS). The proposed circuit architecture effectively mitigates the effects of parasitic cable capacitance and the input capacitance of operational amplifiers. This approach provides a low-cost, compact, fast, and highly accurate solution, making it suitable for applications of liquid-level measurement in hazardous or hard-to-access environments through remote capacitive sensor measurement.

Prommee, Pipat

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