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Single VDGA-based dual-mode multifunction biquadratic filter and quadrature sinusoidal oscillator
(2020-01-01)
Tangsrirat, Worapong
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Pukkalanun, Tattaya
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Channumsin, Orapin
This article relates to the realization of voltage-mode and/or current-mode multifunction biquadratic filter and quadrature oscillator circuits each using one voltage differencing gain amplifier (VDGA), two resistors and two grounded capacitors. The proposed dual-mode filter having one output and three inputs can provide the three standard biquadratic transfer functions with both voltage and current output filter responses simultaneously. It also has the independent tuning of the angular resonance frequency and the quality factor. With a slight modification of the proposed filter, a new dual-mode quadrature sinusoidal oscillator can be obtained. The proposed quadrature oscillator provides orthogonal resistive/electronic control of both oscillation condition and oscillation frequency. Non-ideal and parasitic conditions are also examined and their effects on the circuit performance are discussed. To confirm the theory, several computer simulation results with PSPICE program are given.
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Three-input single-output current-mode biquadratic filter with high-output impedance using a single current follower transconductance amplifier
(2017-08-01)
Mongkolwai, Pratya
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
The circuit configuration for realizing a canonical current-mode biquad filter with three inputs and single output is introduced. The introduced filter employs a single current follower transconductance amplifier (CFTA) and a minimum of passive components, i.e., one resistor and two grounded capacitors. It is capable of generating all the five standard biquadratic filtering functions and suitable for current-mode cascading by possessing high-output impedance. Also, the proposed filter can be tuned electronically by an external bias current of the CFTA. The circuit is analyzed for the non-idealities of the used CFTA and possesses attractive low sensitivity performance. PSPICE simulation results are found to be in good agreement with the presented theory.
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Insensitive High-Output Impedance Current-Mode Biquad with a Single Current Follower Transconductance Amplifier
(2017-01-01)
Mongkolwai, Pratya
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
The circuit configuration for realizing a canonical current-mode biquad filter with three inputs and one output is introduced. The introduced filter employs a single current follower transconductance amplifier (CFTA) and a minimum of passive components, i.e., one resistor and two grounded capacitors. It is capable of generating all the five standard biquadratic filtering functions and suitable for current-mode cascading by possessing high-output impedance. Also, the proposed filter can be tuned electronically by an external bias current of the CFTA. The circuit is analyzed for the non-idealities of the used CFTA and possesses attractive low sensitivity performance. PSPICE simulation results are found to be in good agreement with the presented theory.
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Electronically tunable current-mode universal filter using VDTAs and grounded capacitors
(2013-01-01)
Satansup, Jetsdaporn
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Pukkalanun, Tattaya
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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.
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Universal current-mode biquad with minimum components
(2011-07-26)
Channumsin, Orapin
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
A current controllable current-mode universal filter with four inputs and one output employing multi-output current-controlled current conveyors (MOCCCIIs) is described. The proposed circuit offers the following attractive features: employment 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 (ω<inf>0</inf>) and bandwidth (BW); 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.
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Current-mode KHN biquad filter using modified CFTAs and grounded capacitors
(2011-07-26)
Satansup, Jetsdaporn
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
In this paper, a current-mode Kerwin-Huelsman-Newcomb (KHN) filter structure employing four modified current follower transconductance amplifiers (MCFTAs) and two grounded capacitors is proposed. The circuit structure has one low-impedance current input and three high-impedance current outputs, and enables realizing lowpass, bandpass and highpass current responses simultaneously. The bandstop and allpass responses can also be obtained by connecting appropriate output currents directly without additional devices. The proposed filter is capable of providing an independent current-control of the natural angular frequency (ω<inf>0</inf>) and quality factor (Q) through the transconductance of the MCFTA. Moreover, high-Q value filter can be realized by simply tuning the ratio of MCFTA's transconductance. To support the theoretical results, the properties of the presented filter have been verified by simulation results.
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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
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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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Digitally programmable current follower and its applications
(2009-05-01)
Tangsrirat, Worapong
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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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Current-mode universal biquad with orthogonal ωo-Q tuning using OTAs
(2007-12-01)
Mongkolwai, Pratya
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
A two-input two-output (TITO) current-mode universal biquad using only four dual-output operational transconductance amplifier (DO-OTAs) and two grounded capacitors is described. By appropriately connecting the input and output terminals, the proposed circuit can provide lowpass, bandpass, highpass, bandstop and allpass current responses. The filter also offers an independent electronic control of the natural frequency (ω<inf>o</inf>) and the quality factor (Q) through the transconductance gain (g<inf>m</inf>) of the DO-OTAs. No critical matching conditions are imposed for realizing all the filter responses, and all the incremental parameter sensitivities are low. ©2007 IEEE.
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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
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Pukkalanun, Tattaya
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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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