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Author: search.filters.author.Dejhan, KobchaiSubject: search.filters.subject.operational transconductance amplifier

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    Electronically tunable voltage-mode universal filter with single-input five-output using simple OTAs
    (2013-08-01)
    Kumngern, Montree
    ;
    Suwanjan, Peerawut
    ;
    Dejhan, Kobchai
    This article presents a new electronically tunable voltage-mode universal biquadratic filter with single-input five-output using simple operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed configuration provides low-pass, band-pass, high-pass, band-stop and all-pass voltage responses at a high-impedance input terminal that enables easy cascading in voltage-mode. The natural frequency and the quality factor can be set orthogonally by adjusting the circuit components. The natural frequency can also be controlled electronically by adjusting the bias currents of the OTAs. For realising all the five standard filtering functions, no critical-matching conditions are imposed and all the incremental parameter sensitivities are low. Experimental and simulation results that confirm the theoretical predictions are given. © 2013 Copyright Taylor and Francis Group, LLC.
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    Capacitor-grounded electronically tunable voltage-mode OTA-C multifunction filter with three inputs and five outputs
    (2012-12-01)
    Kumngern, Montree
    ;
    Dejhan, Kobchai
    This paper presents an electronically tunable versatile multifunction voltage-mode biquadratic filter with three inputs and five outputs employing five operational transconductance amplifiers, two grounded capacitors and one grounded resistor. The use of grounded capacitors makes the circuit highly suitable for integrated circuit implementation. The proposed filter can simultaneously realize low-pass, band-pass, high-pass, band-stop and all-pass voltage responses by appropriately connecting the input and output terminals. The natural frequency and the quality factor can be orthogonally controlled. No inverting-type input signals are required for realizing all the filter responses, and all the incremental sensitivities are low. PSPICE simulation results are given to confirm the presented theory. © 2012 IEEE.
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    Electronically tunable versatile voltage-mode MIMO OTA-C universal filter
    (2011-12-01)
    Kumngern, Montree
    ;
    Suwanjan, Peerawut
    ;
    Dejhan, Kobchai
    This paper presents a new versatile high input impedance voltage-mode universal filter with multiple-input multiple-output (MIMO) based on single-ended operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed circuit can work as a two-input four-output filter and a three-input single-output filter without changing the circuit topology. The natural frequency (ω <inf>o</inf>) and the quality factor (Q) can be set orthogonally by adjusting the circuit components. The ω <inf>o</inf> can also be controlled electronically by varying the transconductance value of OTAs. The simulation results are performed to confirm the presented theory. © 2011 IEEE.
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    Electronically tunable voltage-mode MIMO universal filter using single-ended OTAs
    (2011-01-01)
    Kumngern, Montree
    ;
    Dejhan, Kobchai
    This paper presents a new voltage-mode multiple-input multiple-output (MIMO) multifunction filter using five single-ended operational transconductance amplifiers (OTAs), two capacitors and one resistor. The proposed filter can provides low-pass, band-pass, high-pass, band-stop and all-pass voltage responses by appropriately connecting the input and output terminals. The natural frequency and the quality factor can be controlled orthogonally and electronically by adjusting the biasing currents of OTAs. Simulation results are also performed to confirm the theoretical analysis. © 2011 IEEE.