Tangsrirat, Worapong

Preferred name

Alternative Name

Tangsrirat, W.

Main Affiliation

School of Engineering

worapong.ta@kmitl.ac.th

Now showing 1 - 10 of 61

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Single-input and three-output current-mode biquadratic filters using multiple-output OMAs
(2002-01-01)
Tangsrirat, W.
;
Unhavanich, S.
;
Dumawipata, T.
;
Surakampontorn, W.
A novel circuit configuration for the realization of the single-input and three-output (SITO) current-mode biquadratic filters employing only three multiple-output operational mirrored amplifiers (OMAs) is presented. The proposed circuit can simultaneously realize lowpass, bandpass and highpass filter functions at three high-impedance outputs without changing the circuit configuration and elements. Moreover, the resultant current-mode filter provides low passive and active sensitivities, uses of only grounded passive elements and can be orthogonal tuned of the parameters at and Q-factor.
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Electronically tunable phase shifter using CDTAs
(2009-12-01)
Marungreang, Nattaphon
;
Tanjaroen, Wason
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
The realization of an electronically tunable phase shifter using current differencing transconductance amplifiers (CDTAs) as active components is presented. The proposed filter employs only two CDTAs and one virtually grounded capacitor, which its phase shift can be electronically adjusted by varying the bias current of the CDTA. The circuit also exhibits high-output impedance, which is easy cascading in the current-mode operation. As application example, the current-mode biquad filter based on the proposed CDTA-based phase shifter circuit is also presented. PSPICE simulation results of the proposed circuit and its application are given to confirm the theoretical analysis.
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Cascadable current-mode filters using CDTAs
(2009-12-01)
Pongpisal, Tanin
;
Unhavanich, Sumalee
;
Tangsrirat, Worapong
;
Surakampontorn, Wanlop
In this paper, a variety of cascadable current-mode filter architectures incorporating current differencing transconductance amplifiers (CDTAs) and grounded passive elements are realized. The proposed filter topologies mainly contain the CDTA-based cascaded filter structure and the current feedback loop, which provides a systematic and structural method for realizing general filtering functions. They are convenient for integration, electronically tunable, easy cascadability, of low sensitivity, simple in structure and easy to design. Design examples and simulation results by PSPICE confirm the usefulness of the proposed approach.
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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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Single-resistance-controlled quadrature oscillator using current differencing buffered amplifiers
(2008-01-01)
Tangsrirat, W.
;
Prasertsom, D.
;
Piyatat, T.
;
Surakampontorn, W.
A single-resistance-controlled quadrature oscillator circuit using current differencing buffered amplifiers (CDBAs) as active components is proposed. The proposed circuit is realised through the employment of two CDBAs, three resistors and two grounded capacitors. Outputs of two sinusoidal with 90 phase difference are available. The oscillation condition and the oscillation frequency of the proposed quadrature oscillator can be controlled independently by a single resistor. In comparison with the previously reported circuits, the proposed configuration considerably reduces the number of passive elements.
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Current-mode leapfrog ladder filters using CDBAs
(2002-01-01)
Tangsrirat, Worapong
;
Fujii, Nobuo
;
Surakampontorn, Wanlop
In this paper, a possible realization of a current differencing buffered amplifier (CDBA) in the low-voltage operation is proposed. A leapfrog simulation of the current-mode ladder network using the CDBA as active circuit building blocks is then introduced. In order to demonstrate that the CDBA considerably simplifies the leapfrog structure of the current-mode ladder filters, a fifth-order Butterworth low-pass filter and a sixth-order Chebyshev bandpass filter which require a minimum of active components will be presented. PSPICE simulation results are employed to verify the correctness of the realization procedure.
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CDTA-based current limiters and applications
(2008-12-01)
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
In this paper, a synthesis of analog current limiter (CL) building blocks based on a current differencing transconductance amplifier (CDTA) is proposed. The breakpoint and the slope of the resulting transfer characteristic obtained from the proposed CDTA-based CLs are electronically programmable through the external bias currents. To demonstrate versatility of the proposed electronically tunable CLs, some nonlinear applications to programmable current- mode precision full-wave rectifier and piecewise-linear function approximation generators are also presented. SPICE simulations confirm the effectiveness of the proposed circuits. © 2008 IEEE.
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Current-mode multiphase sinusoidal oscillator using CDTA-based allpass sections
(2009-07-01)
Tangsrirat, Worapong
;
Tanjaroen, Wason
;
Pukkalanun, Tattaya
In this work, a current tunable current-mode multiphase sinusoidal oscillator (MSO) employing current differencing transconductance amplifier (CDTA)-based first-order allpass sections is presented. The proposed MSO circuit, which uses only two CDTAs and one virtually grounded capacitor for each phase, can generate arbitrary 2 n-phase current-output signals (n = 2, 3, 4, ...) equally spaced in phase, all at high output impedance terminals. The oscillation condition and the oscillation frequency can be controlled electronically and independently by adjusting the bias current of the CDTA. The oscillator has low-sensitivity performance. Simulation results are also given to verify the functionality of the proposed oscillator. © 2008 Elsevier GmbH. All rights reserved.
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CMOS digitally controlled current follower and its application
(2009-12-01)
Prasertsom, Danucha
;
Tangsrirat, Worapong
A realization of the CMOS digitally controlled current follower (DC-CF) suitable for low-voltage high-frequency application is proposed. To achieve very low input resistance, it is realized using a modification of a low-input resistance stage as an input stage. To achieve the precise digital control of the current gain, the current division technique is used. The proposed DC-CF can operate with low voltage supplies of ±1.5 V, and is designed with 0.5- μm CMOS SCN05H process. As an application, the digitally programmable current-mode universal filter using the proposed DC-CF is given. Simulation results are also included.
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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.

Tangsrirat, Worapong

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