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Author: search.filters.author.Tangsrirat, WorapongSubject: search.filters.subject.Current follower transconductance amplifier (CFTA)

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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
    ;
    Pukkalanun, Tattaya
    ;
    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
    ;
    Pukkalanun, Tattaya
    ;
    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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    Single-input three-output electronically tunable universal current-mode filter using current follower transconductance amplifiers
    (2011-10-01)
    Tangsrirat, Worapong
    In this paper, an electronically tunable universal filter configuration with single input and three outputs (SITO) employing a recently introduced active device namely current follower transconductance amplifier (CFTA) is described. The proposed filter is composed of four CFTAs and two grounded capacitors, and is capable of realizing all the standard functions of the universal filter without requiring any component matching criterions and any extra active components. It exhibits low-input and high-output impedances, which is highly desirable for cascading in current-mode. It also offers the advantage feature of an independent electronic adjustment of the natural angular frequency (ω<inf>o</inf>) and the quality factor (Q) by means of tuning the external bias currents. Moreover, a high Q-value filter can be obtained by simply adjusting the appropriate ratio of bias currents. The analysis of active and passive sensitivities is shown to be low. In order to demonstrate the performance of the proposed circuit, PSPICE simulation results are provided. © 2011 Elsevier GmbH. All rights reserved.
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    Novel current-mode and voltage-mode universal biquad filters using single CFTA
    (2010-04-01)
    Tangsrirat, Worapong
    This paper presents two novel electronically tunable universal filter configurations employing a single new active device, namely the current follower transconductance amplifier (CFTA). The first proposed current-mode universal filter with single input and three outputs consists of one CFTA, one virtually grounded resistor and two grounded capacitors. It can simultaneously realize low-pass, band-pass and high-pass responses with no need to impose component choice. A new three-input single-output universal voltage-mode biquad using one CFTA, two resistors and two capacitors is also proposed as a second proposed circuit. The latter circuit can be configured to realize all the five standard biquadratic filter functions; low-pass, band-pass, high-pass, band-stop and all-pass, without changing the circuit configuration. Both two universal biquad filters also offer the advantage features of the use of minimum number of passive components, and independent electronic tuning of the important filter parameters (wo and BW), as well as low active and passive sensitivities. To demonstrate the performances of the proposed filters and verify the theory, PSPICE simulations are accomplished.