Pukkalanun, Tattaya

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Pukkalanun, Tattaya
Alternative Name
Pukkalanun, T.
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Email
tattaya.pu@kmitl.ac.th

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    Item type:Publication,
    Electronically tunable current-mode universal filter using VDTAs and grounded capacitors
    (2013-01-01)
    Satansup, Jetsdaporn
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    In this paper, an electronically tunable current-mode universal filter with three inputs and one output employing two voltage differencing transconductance amplifier (VDTA) and two grounded capacitors is proposed. The presented circuit can configure to realize all the five standard biquadratic filter functions; lowpass, bandpass, highpass, bandstop and allpass without changing the circuit configuration and needing an external passive resistor. The proposed filter is capable of providing an independent current-control of the natural angular frequency (ωo) and quality factor (Q) through the VDTA's transconductance and low incremental active and passive sensitivities. The performance of the proposed filter is tested using PSPICE simulation program, and the results agree well with the theoretical analysis.
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    Item type:Publication,
    Current-mode KHN biquad filter using modified CFTAs and grounded capacitors
    (2011-07-26)
    Satansup, Jetsdaporn
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    In this paper, a current-mode Kerwin-Huelsman-Newcomb (KHN) filter structure employing four modified current follower transconductance amplifiers (MCFTAs) and two grounded capacitors is proposed. The circuit structure has one low-impedance current input and three high-impedance current outputs, and enables realizing lowpass, bandpass and highpass current responses simultaneously. The bandstop and allpass responses can also be obtained by connecting appropriate output currents directly without additional devices. The proposed filter is capable of providing an independent current-control of the natural angular frequency (ω<inf>0</inf>) and quality factor (Q) through the transconductance of the MCFTA. Moreover, high-Q value filter can be realized by simply tuning the ratio of MCFTA's transconductance. To support the theoretical results, the properties of the presented filter have been verified by simulation results.