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Author: search.filters.author.Mongkolwai, PratyaSubject: search.filters.subject.Current-mode circuit

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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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    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-mode universal biquad with orthogonal ωo-Q tuning using OTAs
    (2007-12-01)
    Mongkolwai, Pratya
    ;
    Pukkalanun, Tattaya
    ;
    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.