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Electronically tunable multiple-input single-output voltage-mode multifunction filter employing simple CMOS OTAs
(2010-12-01)
Kumngern, Montree
;
Torteanchai, Usa
;
Dejhan, Kobchai
This paper describes a new electronically tunable four inputs and single output voltage-mode universal biquadratic filter based on simple CMOS operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed filter provides low-pass, high-pass, band-pass, band-stop and all-pass voltage responses at a high impedance input terminal, which enable easy cascadability. The circuit parameters ω<inf>o</inf> and Q can be orthogonally set the circuit component. The parameter ω<inf>o</inf> also offers an electronic control by adjusting the transconductance gain of the OTA. For realizing all the filter responses, no critical component matching condition is required and all the parameter sensitivities are low. PSPICE simulation results are performed to confirm the theoretical analysis. © 2010 IEEE.
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Electronically tunable high-input impedance voltage-mode universal biquadratic filter based on simple CMOS OTAs
(2010-10-01)
Kumngern, Montree
;
Knobnob, Boonying
;
Dejhan, Kobchai
This paper describes a new electronically tunable three inputs and single output voltage-mode universal biquadratic filter based on simple CMOS operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed configuration provides lowpass, highpass, bandpass, bandstop and allpass voltage responses at a high impedance input terminal, which enable easy cascadability. Additionally, the circuit parameters ωo and Q can be set orthogonally by adjusting the transconductances and grounded capacitors. The filter also offers an independent electronic control of parameters ωo by adjusting the transconductance through the bias current/voltage of the OTA. For realizing all the filter responses, no critical component matching condition is required, and all the incremental parameter sensitivities are low. PSPICE simulation results are performed to confirm the theoretical analysis. © 2009 Elsevier GmbH. All rights reserved.
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Electronically tunable voltage-mode universal filter with three-input single-output
(2010-08-11)
Kumngern, Montree
;
Dejhan, Kobchai
A new electronically tunable voltage-mode universal filter with three-input single-output using six simple CMOS operational transconductance amplifiers and two capacitors is proposed. The proposed filter provides lowpass, bandpass, highpass, bandstop and allpass voltage responses. Also, the parameters ω<inf>o</inf> and Q can be set orthogonally by adjusting the circuit components. The performances of the proposed circuit are simulated with PSPICE to confirm the presented theory. ©2010 IEEE.
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Realization of OTA-C current-mode universal filter based on two type integrators loop
(2007-12-01)
Prommee, Pipat
;
Somdunyakanok, Montri
;
Angkeaw, Krit
;
Dejhan, Kobchai
A universal current-mode active filter based on 2 types of integrator, lossy and lossless integrators, is presented. The biquadratic transfer function is obtained by the two integrators loop. The proposed circuit employs only 2 multiple output OTAs (MO-OTA) and 3 capacitors. The parameter Q<inf>P</inf> can be wide-range tuned independent from the ω<inf>P</inf> either changing of capacitor and transconductance gains. Moreover, the four different kind filter functions as lowpass, highpass, bandpass and band-reject response can be also obtained without changing circuit topology. The parameters ω<inf>p</inf> can be electronically tuned through adjusting the transconductance gains of the OTAs. The simulation results have been carried out by PSpice. © 2007 IEEE.

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