Tangsrirat, Worapong

Preferred name

Alternative Name

Tangsrirat, W.

Main Affiliation

School of Engineering

worapong.ta@kmitl.ac.th

Now showing 1 - 10 of 119

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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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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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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.
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Voltage-mode electronically tunable universal filter employing single CFTA
(2010-07-30)
Sirirat, Jamaree
;
Tangsrirat, Worapong
;
Surakampontorn, Wanlop
An electronically tunable universal filter configuration which employs a single new active device namely current follower transconductance amplifier (CFTA) and four passive components is described. The presented circuit can be configured to realize all the five standard biquadratic filter functions; lowpass, bandpass, highpass, bandstop and allpass, without changing the circuit configuration. The filter also provides the advantage features of the use of only one active component and minimum number of passive components, and independent electronic tuning of the natural angular frequency(ω <inf>o</inf>) and bandwidth (BW), as well as low active and passive sensitivities.
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FDNC realization and its application to FDNR and filter realizations
(2016-01-01)
Theingjit, Sasitapom
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
A simple circuit for the realization of the frequency-dependent negative conductance (FDNC) using active transconductance (C) elements is discussed. Based on the realized FDNC as fundamental circuit element, the frequency-dependent negatIve resistances (FDNR) can also be obtained. The equivalent value of the realized D element can be adjusted electronically by means of the transconductance parameters. Both simulator circuits do not require the component-matching condition , and enjoy employing only C, c ells together with two grounded capacitors; accordingly, they are canonical structures and convenient for integration. Simulation results with TSMC 0.35-urn CMOS technology are presented to validate the characteristics of the realized simulator circuits and application.
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Cascadable current-mode first-order allpass filter using current controlled conveyors
(2013-10-01)
Tangsrirat, Worapong
This paper presents a canonical current-mode first-order allpass filter using two current controlled conveyors (CCCIIs) and a single grounded capacitor. The proposed circuit simultaneously realizes both inverting and non-inverting types of first-order allpass functions without needing component matching constraints. Its pole frequency (ω<inf>0</inf>) can be adjusted electronically by means of a bias current of the CCCII. The presented circuit also possesses both low-input and high-output impedances, which are suitable for current-mode cascading. Simulation results including frequency response and transient analysis are incorporated to confirm the theoretical analysis.
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Current gain controlled CFTA and Its application to resistorless quadrature oscillator
(2012-10-02)
Prasertsom, Danucha
;
Tangsrirat, Worapong
This paper presents the concept of the current follower transconductance amplifier (CFTA) with current gain controllable. The newly modified element is a combination of the current follower, the variable gain current mirror, and the balance output transconductance amplifier. The advantage of the proposed element is that the current transfer characteristics (i <inf>z</inf>/i <inf>f</inf> and i <inf>x</inf>/i <inf>z</inf>) can be electronically tuned by means of external bias currents. As application example, the resistorless realization of current-mode quadrature oscillator based on the proposed current controlled gain CFTA element is also presented. PSPICE simulation results of the proposed circuit and its application are given to confirm the theoretical analysis. © 2012 IEEE.
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Voltage differencing transconductance amplifier-based floating simulators with a single grounded capacitor
(2014-01-01)
Tangsrirat, Worapong
;
Unhavanich, Sumalee
Two simple configurations for simulating the resistorless floating inductor and capacitor using voltage differencing transconductance amplifier (VDTA) as a novel active element have been presented in this paper. The proposed floating simulated inductance circuit uses only one VDTA and one grounded capacitor, whereas the proposed floating simulated capacitance circuit uses two VDTAs and one grounded capacitor. The equivalent values of the realized simulators can be tuned electronically through the transconductance parameter of the VDTA. Both of the circuits also do not require any realization conditions. The proposed circuits together with their applications are demonstrated using PSPICE simulation with 0.35 μm TSMC CMOS technology. Copyright © 2012 The Council of Scientific and Industrial Research.

Tangsrirat, Worapong

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