Tangsrirat, Worapong

Preferred name

Alternative Name

Tangsrirat, W.

Main Affiliation

School of Engineering

worapong.ta@kmitl.ac.th

Now showing 1 - 10 of 36

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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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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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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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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.
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Simple current-mode analog multiplier, divider, square-rooter and squarer based on CDTAs
(2011-03-01)
Tangsrirat, Worapong
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Pukkalanun, Tattaya
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Mongkolwai, Pratya
;
Surakampontorn, Wanlop
In this paper, the design of simple analog current-mode multiplier, divider, square-rooter and squarer circuits using only two current differencing transconductance amplifiers (CDTAs) is proposed. With the selection of the applied input currents, the proposed circuit can perform four-quadrant current multiplication, division and current-controlled current amplification, without changing its configuration. Moreover, the current-mode square-rooter and squarer circuits can easily be obtained with the possibility of electronically transfer gain adjustment by slight modification of the proposed configuration. All the proposed circuits are insensitive to ambient temperature variations. Additionally, the CDTA non-ideality effects on the proposed circuits are also investigated and discussed. The performances of the realized circuits are examined by PSPICE simulations. © 2010 Elsevier GmbH. All rights reserved.
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An integrable current-mode root-n circuit
(1999-12-01)
Tangsrirat, Worapong
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Kumwatchara, Kiattisak
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Surakampontorn, Wanlop
;
Riewruja, Vanchai
In this paper, a simple circuit design technique for realizing an integrable current mode nth- order rooting circuit based on a class AB configuration and a translinear loop implemented from bipolar transistors is described. The proposed circuit can provide two-quadrant nth- order rooting output signal, wide dynamic range and the circuit are readily integrable. Some PSPICE simulation results are also included demonstrating the characteristic of the proposed technique.
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Single-resistance-controlled quadrature oscillator and universal biquad filter using CFOAs
(2009-12-01)
Tangsrirat, Worapong
;
Surakampontorn, Wanlop
This paper presents new single-resistance-controlled (SRC) sinusoidal quadrature oscillator and universal biquad filter circuits with reduced number of passive elements using only two current-feedback operational amplifiers (CFOAs). The first proposed oscillator configuration comprising two CFOAs, three resistors and two capacitors provides two sinusoidal voltage outputs in phase quadrature. The circuit has the advantage of independent control of the condition of oscillation and the oscillation frequency through a single resistor. The second proposed biquad filter configuration consisting of only two CFOAs, two resistors and two capacitors realizes all the standard types of the biquadratic filter functions at low-impedance output without any component matching conditions. The filter also provides orthogonal control of the natural angular frequency (ω<inf>0</inf>) and the bandwidth (BW). In addition, both proposed circuit configurations have good active and passive sensitivity performances. PSPICE simulations and experimental results based on commercially available AD844-type CFOAs are included, showing the excellent performance of the proposed configurations. © 2008 Elsevier Ltd. All rights reserved.
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Simple current-mode square-rooting circuit with temperature compensation using only OTAs
(2010-01-01)
Tangsrirat, Worapong
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Prasertsom, Danucha
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Pukkalanun, Tattaya
;
Surakampontorn, Wanlop
A simple current-controlled current-mode square-rooting circuit with temperature compensation employing operational transconductance amplifi ers (OTAs) as active elements is proposed. It has been designed by using only four OTAs, without the employment of additional passive elements. The current gain of the proposed circuit can be electronically controlled, thanks to the tuning property of the OTA. Simulation and experimental results are obtained to verify the theoretical analysis of the proposed circuit technique.
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Simple design technique for realizing low-voltage low-power CMOS current multiplier
(2015-01-01)
Tangjit, Jetwara
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Tangsrirat, Worapong
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Satansup, Jetsdaporn
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Surakampontorn, Wanlop
A simple circuit design technique for the realization of compact low-voltage low-power CMOS four-quadrant analog current multiplier circuit has been suggested. It is based on the use of the square-law characteristic in the NMOS current squaring function circuit operating in the saturation region. The suggested four-quadrant current multiplier circuit is designed for implementing in TSMC 0.25-μm CMOS technology with a low supply voltage of ±0.75V. To evaluate the circuit performance, the circuit has been simulated by PSPICE program. The simulation results show that the circuit has a linearity error of about 1%, a THD of 1.07% at 100 kHz, the total power consumption of 87.6 μW and -3dB bandwidth of 1.32 GHz.

Tangsrirat, Worapong

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