Tangsrirat, Worapong

Preferred name

Alternative Name

Tangsrirat, W.

Main Affiliation

School of Engineering

worapong.ta@kmitl.ac.th

Now showing 1 - 10 of 277

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Vdiba-based floating lossless inductance simulator employing a single grounded capacitor
(2016-09-01)
Pimpol, Jirapun
;
Channumsin, Orapin
;
Thongsopa, Chanchai
;
Tangsrirat, Worapong
This paper presents an actively floating lossless inductance simulator based on employing voltage differencing inverting buffered amplifiers (VDIBAs) as new active components. The proposed synthetic inductor employs only two VDIBAs and one grounded capacitor, which is resistorless structure and suitable for integrated circuit design. The realized equivalent inductance is electronically adjustable through the transconductance parameter of the VDIBA. An application example of the proposed tunable floating lossless inductor on the realization of the second-order RLC bandpass filter has been designed and simulated. PSPICE simulation results with standard 0.35 μm BiCMOS process model are also included to demonstrate the utility as well as the workability of the proposed simulator.
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New Single VDCC Based Electronically Adjustable FDNR using Grounded Capacitances
(2022-08-01)
Srivastava, Mayank
;
Bhardwaj, Kapil
;
Prasad, Dinesh
;
Singh, Ramendra
;
Tangsrirat, Worapong
A FDNR (Frequency Dependent Negative Resistance) simulator has been presented, which uses single Voltage Differencing Current Conveyor (VDCC) along with two grounded capacitances to realize the pure FDNR function. The proposed FDNR simulator places itself as one of the most compact circuit architecture present in the available literature. It is a resistor-less realization and finds no requirement of any active/passive component/parameter matching to realize the FDNR behaviour. The presented analysis shows that the proposed circuit remains always stable under the effect of parasitics irrespective of any values of circuit parameters, which is not witnessed in many previously reported FDNRs. The usability of realized synthetic FDNR has been checked through validation of developed higher-order CDR filters by using the proposed FDNR. To verify the designed circuits, the presented configurations have been simulated under the PSPICE simulation environment. The experimental results are shown for the commercial ICs (AD844 and CA3080) based physical realization of described FDNR.
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Floating Series RC Impedance Simulator Using Single FB-VDBA
(2020-03-01)
Pimpol, Jirapun
;
Channumsin, Orapin
;
Tangsrirat, Worapong
This article introduces a floating series RC impedance simulator circuit employing a single fully-balanced voltage differencing buffered amplifier (FB-VDBA), as an active element. The presented simulation includes only one FB-VDBA, a single resistor, and a single capacitor. The simulated equivalent series resistance and capacitance values are alterable via the DC biasing current of the FB-VDBA. As a demonstrative application, the presented floating series RC impedance is applied to configuration a 2<sup>nd</sup> order high-pass filter. To evaluate the correctness operation of the presented circuit and its application, the simulation results based upon TSMC 0.25-μm CMOS technology are also contained.
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Realization of Lossy Parallel Inductance Simulator Using Single VDGA and a Grounded Capacitor
(2022-01-01)
Satansup, Jetsdaporn
;
Roongmuanpha, Natchanai
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
An active lossy parallel type inductance simulator is proposed in this study. Only a single voltage differencing gain amplifier (VDGA) and a grounded capacitor are used in the proposed design. The realized equivalent resistance (Req) and equivalent inductance (Leq) can be adjusted electronically via the transconductance gain of the VDGA device. The influence of the non-idealities of the VDGA on the realized simulator is examined in detail. The suggested active inductance simulator is used to realize the second order voltage mode highpass filter, which is simulated using the PSPICE simulation program to ensure that it performs as expected.
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Voltage differencing gain amplifier-based sinusoidal quadrature oscillator using only two grounded capacitors
(2019-01-01)
Channumsin, Orapin
;
Tangsrirat, Worapong
Background: This article describes the circuit construction of the sinusoidal quadrature oscillator using two Voltage Differencing Gain Amplifiers (VDGAs) as active devices. Methods: Since the presented oscillator circuit uses only two external grounded capacitors as pas-sive elements, it is quite suitable for monolithic integration point of view. The condition of oscilla-tion and the frequency of oscillation are non-interactive, and can be controlled electronically by tun-ing two separate biasing currents. Non-ideal analysis and sensitivity performance are also discussed. Results: The feasibility of the designed oscillator is justified by the PSPICE simulation results based on TSMC 0.35-µm CMOS process parameters. Conclusion: The effects of the VDGA non-idealities on the proposed circuit are also provided, and the computer simulations based on TSMC 0.35-mm CMOS model parameters are included to evalu-ate the performance of the circuit.
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A Novel Practical Fixed-Time Speed Control of Permanent Magnet Synchronous Motors with Input Saturation
(2025-01-01)
Cholahan, Varin
;
Wongvanich, Napasool
;
Tangsrirat, Worapong
In this article, we focus on a control problem for the speed control of a permanent magnet synchronous motor (PMSM). An antisaturation adaptive fixed-time nonsingular sliding mode control (AFFTNSM) with disturbance estimation compensation is designed for a class of second-order nonlinear systems to improve PMSM system performance. Firstly, a novel fast fixed-time nonsingular sliding mode surface is chosen based on the error dynamic equation. Then, a practical fixed-time sliding mode control algorithm is proposed where the stability of the proposed controller is demonstrated to show the convergence of the velocity tracking error to a neighborhood of the origin in fixed-time. The implementation of feedforward compensation of disturbance enhances the dynamic performance of the fast fixed-time nonsingular sliding mode control rule, resulting in reduced chattering phenomena. Numerical simulation results are provided to verify the efficiency of the proposed method.
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Cascadable First-Order and Second-Order Inverse Filters Based on Second-Generation Voltage Conveyors
(2025-02-01)
Roongmuanpha, Natchanai
;
Likhitkitwoerakul, Nutcha
;
Pukkalanun, Tattaya
;
Faseehuddin, Mohammad
;
Tangsrirat, Worapong
This study introduces four novel configurations of first-order and second-order multifunction inverse filters in both voltage-mode (VM) and current-mode (CM) using second-generation voltage conveyors (VCIIs). The first-order VM and CM inverse filters utilize only three passive components together with one VCII for VM and two VCIIs for CM realizations, which can provide lowpass and highpass inverse filter responses. The latter, second-order VM and CM multifunction inverse filters, can be constructed using the corresponding first-order inverse filters as their core circuits. These filters offer all the basic inverse filter functions, including lowpass, bandpass, and highpass inverse responses with all gains obtained from the same design. All the inverse filter realizations are cascadable. No component matching requirements are necessary for all filter responses. The non-ideal effects of the VCII on the performance of the proposed inverse filters are thoroughly examined. To prove the feasibility of the designs, the PSPICE program performed several simulations, utilizing model parameters of 0.18 µm CMOS technology. Some testing experiments were conducted using the commercially available IC-type AD844s for evaluating the practical performance of the designed inverse filters.
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Single CFTA-based dual-mode biquadratic filter
(2018-06-08)
Channumsin, Orapin
;
Photsathian, Thongchai
;
Tangsrirat, Worapong
A scheme consisting of only one current follower transconductance amplifier (CFTA) and four passive components is introduced for realizing the novel dual-mode universal biquadratic filter. The introduced filter can perform either in voltage-mode or current-mode, and can realize the highpass, bandpass and lowpass filter responses simultaneously without needing any element matching constraints. The natural angular frequency (ω<inf>o</inf>) and the quality factor (Q) of the filter can be tuned electronically by the transconductance gain of the CFTA. Computer simulations are used to confirm the workability of the proposed circuit.
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Resistorless tunable capacitance multiplier using single voltage differencing inverting buffered amplifier
(2017-01-01)
Tangsrirat, Worapong
The paper focuses on a novel configuration for the realization of the resistorless tunable grounded capacitance multiplier circuit using the newly introduced active building block called voltage differencing inverting buffered amplifier (VDIBA). The proposed capacitance multiplier circuit consists of only single VDIBA, one capacitor and one NMOS transistor acting as a voltagecontrolled resistor (VCR). The equivalent capacitance value of the synthetic capacitor can be tuned electronically by adjusting the biasing current of the VDIBA and/or changing the control voltage of the VCR. To evaluate the behaviour of the circuit, an illustrative RC low-pass filter has been provided. Simulation results with TSMC 0.25 μm CMOS technology verify the theoretical analysis.
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Minimum-component current-mode universal filter
(2011-02-01)
Tangsrirat, Worapong
;
Channumsin, Orapin
This paper describes a current controllable current-mode universal filter with three inputs and one output using multi-output current-controlled current conveyors (MOCCCIIs). The proposed circuit consists of the minimum number of active and passive components, i.e. two MOCCCIIs and two grounded capacitors; simultaneous realization of all the standard filtering functions; independent current-control of the natural angular frequency (ω0) and bandwidth (BW); no requirement of component matching conditions; and low passive and active sensitivities. Copyright © 2011.

Tangsrirat, Worapong

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