Tangsrirat, Worapong

Preferred name

Alternative Name

Tangsrirat, W.

Main Affiliation

School of Engineering

worapong.ta@kmitl.ac.th

Now showing 1 - 10 of 33

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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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Compact VDTA-based current-mode electronically tunable universal filters using grounded capacitors
(2014-01-01)
Satansup, Jetsdaporn
;
Tangsrirat, Worapong
This paper presents a compact current-mode three-input single-output (TISO) type universal filter. Only one voltage differencing transconductance amplifier (VDTA) and two grounded capacitors are employed in the proposed filter. The circuit can realize lowpass, bandpass, highpass, bandstop and allpass biquadratic filter outputs by connecting the appropriate inputs, and offers electronic control of the natural angular frequency (ω<inf>0</inf>) and quality factor (Q) by means of adjusting the transconductance gain of the VDTA. In addition, by slight modification of the proposed scheme, another more useful TISO construction with orthogonal ω<inf>0</inf>-Q tuning has been obtained. Both the discussed universal filters have been shown to have low incremental active and passive sensitivities. To demonstrate the performances of the filters and verify the theoretical analysis, computer simulations are accomplished with the PSPICE program. © 2014 Elsevier Ltd.
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1.5-V CMOS current multiplier/divider
(2018-06-01)
Satansup, Jetsdaporn
;
Tangsrirat, Worapong
A circuit technique for designing a compact low-voltage current-mode multiplier/divider circuit in CMOS technology is presented. It is based on the use of a compact current quadratic cell able to operate at low supply voltage. The proposed circuit is designed and simulated for implementing in TSMC 0.25-μm CMOS technology with a single supply voltage of 1.5 V. Simulation results using PSPICE, accurately agreement with theoretical ones, have been provided, and also demonstrate a maximum linearity error of 1.5%, a THD less than 2% at 100 MHz, a total power consumption of 508 μW, and -3dB small-signal frequency of about 245 MHz.
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Low passive component-count current follower-based current-mode second-order notch filter
(2005-01-01)
Prasertsom, D.
;
Pukkalanun, T.
;
Tangsrirat, W.
;
Surakampontorn, W.
A realization of a current-mode second-order notch filter using current followers (CFs) and a minimum number of passive elements is proposed. The proposed filter has a high output impedance, consequently it can be cascaded without using additional buffers. The filter displays low incremental passive sensitivities. Moreover, if the passive element values are properly chosen, the circuit permits also the realization of allpass response. The SPICE simulation results are given to verify the theoretical predicted behaviors. © 2005 IEEE.
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Simple current-mode square-rooting circuit with temperature compensation using only OTAs
(2010-01-01)
Tangsrirat, Worapong
;
Prasertsom, Danucha
;
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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CCCII-based high-output impedance current-mode universal filter employing only grounded capacitors
(2006-12-01)
Jangsamsi, Niwat
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
A current-controlled current-mode universal filter with three inputs and one output using only three current-controlled current conyevors (CCCIIs) and two grounded capacitors is described. The proposed filter provides lowpass, bandpass, highpass, bandstop and allpass current outputs at a high impedance terminal, which enable easy cascadability. The filter also offers an independent electronic control of the natural frequency ω<inf>0</inf> and the parameter ω<inf>0</inf>Q through adjusting the bias current of the CCCII. No critical matching condition is required for realizing all the filter responses, and all the incremental parameter sensitivities are low. The performances of the proposed circuit are simulated with PSPICE to confirm the presented theory. © 2006 ICASE.
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Digitally programmable current follower and its applications
(2009-05-01)
Tangsrirat, Worapong
;
Pukkalanun, Tattaya
In this paper, a CMOS implementation of the digitally programmable current follower (DP-CF) is presented. 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 DP-CF is operated under ± 1.5 V voltage supplies, and designed with 0.5-μ m CMOS SCN05H process. Applications of the proposed DP-CF in realizing digitally programmable current-mode filter and rectifier are given. SPICE simulation results of the proposed circuit and its applications are also included. © 2008 Elsevier GmbH. All rights reserved.
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Electronically Controllable Resistorless Dual-Mode Multifunction Filter
(2017-01-01)
Mongkolwai, Pratya
;
Tangsrirat, Worapong
A circuit topology using two compact tunable transconductance cells (G<inf>m</inf>-cells) and three capacitors is presented for realization of an electronically tunable resistorless dual-mode multifunction filter. The presented multifunction filter can operate either in voltage-mode or current-mode, and can realize the highpass, bandpass and lowpass filter responses simultaneously. The filter parameters, i.e. the natural angular frequency (<inf>o</inf>) and the quality factor (Q), are electronically controllable by means of the transconductance gains. No element matching constraints are necessary, and the active and passive component sensitivities are low. PSPICE simulation results based on TSMC 0.25-m CMOS real process agree closely with the theoretical calculations.
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Current-controlled current-mode biquadratic filter with two inputs and three outputs using multiple-output FTFNs
(2006-12-01)
Hirunporm, Jirawat
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
A current-controlled current-mode biquadratic filter using a modified type of a four-terminal floating nullor (FTFN), which is called as an electronically tunable multiple-output FTFN (ET-FTFN), is proposed. The proposed filter with two-input and three-output terminals comprises only ET-FTFNs and four grounded passive elements. The filter can simultaneously realize the inverting-type lowpass, noninverting-type lowpass, inverting-type banpass, noninverting-type bandpass, highpass, bandstop and allpass filter functions. The natural angular frequency and the quality factor are independently controlled by adjusting the external bias currents of the ET-FTFNs. All the active and passive sensitivities are low. PSPICE simulation results are employed to verify the circuit performance. © 2006 ICASE.
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Electronically tunable current-mode universal filter using VDTAs and grounded capacitors
(2013-01-01)
Satansup, Jetsdaporn
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
In this paper, an electronically tunable current-mode universal filter with three inputs and one output employing two voltage differencing transconductance amplifier (VDTA) and two grounded capacitors is proposed. The presented circuit can configure to realize all the five standard biquadratic filter functions; lowpass, bandpass, highpass, bandstop and allpass without changing the circuit configuration and needing an external passive resistor. The proposed filter is capable of providing an independent current-control of the natural angular frequency (ωo) and quality factor (Q) through the VDTA's transconductance and low incremental active and passive sensitivities. The performance of the proposed filter is tested using PSPICE simulation program, and the results agree well with the theoretical analysis.

Tangsrirat, Worapong

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