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Author: search.filters.author.Mongkolwai, PratyaSubject: search.filters.subject.Electronically tunable

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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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    Generalized impedance function simulator using voltage differencing buffered amplifiers (VDBAs)
    (2016-01-01)
    Mongkolwai, Pratya
    ;
    Tangsrirat, Worapong
    A circuit topology for simulating grounded inductor, capacitance multiplier and frequency-dependent negative resistor (FDNR) depending on the passive component choice is presented. The presented general impedance function simulator employs two voltage differenclng buffered amplifiers (VDBAs) and three various passive components. The realized equivalent impedance values can be tuned electronically via the transconductance gains of the VDBAS. The simulator does not need any component matching constraints, and also exhibits low active and passive sensitivities. To verify the theory and to exhibit the circuit performance, computer simulation results using PSPICE are provided.