Suwanjan, Peerawut

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Suwanjan, Peerawut
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peerawut.su@kmitl.ac.th

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    Item type:Publication,
    Electronically controlled high input and low output impedance voltage mode multifunction filter with grounded capacitors
    (2014-12-01)
    Ninsraku, Wilas
    ;
    Biolek, Dalibor
    ;
    Jaikla, Winai
    ;
    Siripongdee, Surapong
    ;
    Suwanjan, Peerawut
    In this study, a three-input single-output voltage-mode biquadratic filter employing voltage differencing differential input buffered amplifier (VD-DIBA) is presented. The proposed filter uses two VD-DIBAs and two grounded capacitors without any external resistors, which is well suited for integrated circuit implementation. The circuit provides five standard transfer functions, namely, low pass, high pass, band pass, notch and all pass filters with electronic control of quality factor and pole frequency. Each transfer function can be selected by suitably selecting input signals via digital method. The filter does not require inverting of the input voltage signal. Moreover, the circuit possesses high input and low output impedances and thus it enables simple voltage-mode cascading. The PSPICE simulation and also experimental results are included, verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation.
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    0.5 V fully differential universal filter based on multiple input OTAs
    (2020-01-01)
    Jaikla, Winai
    ;
    Khateb, Fabian
    ;
    Kumngern, Montree
    ;
    Kulej, Tomasz
    ;
    Ranjan, Rajeev Kumar
    The design of a low-power, low-voltage, fully-differential universal biquad filter is presented in this work, which is constructed from four multiple-input gate-driven operational transconductance amplifiers (MI-OTAs) along with one passive resistor and two passive capacitors. The scheme of presented biquad filter has three high-input impedance voltage nodes and single output voltage node. Five unity gain filtering functions, all-pass (AP), low-pass (LP), band-pass (BP), high-pass (HP) and band-stop (BS) responses, are obtained. The selection of output filtering responses is obtained without the need of component matching condition, inverting or double input voltage. With this feature, it can be easily controlled with digital programming. The quality factor (Q) and angular frequency (ω<inf>0</inf>) are electronically and independently tuned. Moreover, the adjustment of ω<inf>0</inf> and Q can be done without affecting the voltage gain. A workability of the design is confirmed via Cadence software and the Spectre simulator based on the 180 nm TSMC CMOS technology parameters. The proposed fully differential filter operates with 0.5 V supply voltage. The results verify that the proposed filter dissipates the total power of 53.3 nW. Additionally, the dynamic range (DR) of band-pass filtering function is 63 dB for 2% third intermodulation distortion (IMD). Also, the simulated RMS value of the band-pass filtering noise is 45 µV.
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    Electronically tunable current-mode biquad filter employing CCCDTAs and grounded capacitors with low input and high output impedance
    (2013-12-01)
    Jaikla, Winai
    ;
    Khateb, Fabian
    ;
    Siripongdee, Surapong
    ;
    Supavarasuwat, Piya
    ;
    Suwanjan, Peerawut
    In this study, a single-input multiple-outputs current-mode analog biquadratic filter, based on current controlled current differencing transconductance amplifier (CCCDTA) is presented. The proposed filter uses two CCCDTAs and two grounded capacitors without any external resistors, which is well suited for integrated circuit implementation. The filter simultaneously gives 3 standard transfer functions, namely, lowpass, highpass and bandpass filters with independent control of quality factor and pole frequency by electronic method. By summing of I<inf>HP</inf> and L<inf>LP</inf>, the notch filter can be also achieved. Moreover, the circuit has low input and high output impedance which would be an ideal choice for cascading in current-mode circuit. The PSPICE simulation results are included verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation. © 2013 Elsevier GmbH.
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