Sunthonkanokpong, Wisuit

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Sunthonkanokpong, Wisuit
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Email
wisuit.su@kmitl.ac.th

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    Item type:Publication,
    Single-input multiple-output voltage-mode shadow filter based on VDDDAs
    (2019-05-01)
    Huaihongthong, Pintira
    ;
    Chaichana, Amornchai
    ;
    Suwanjan, Peerawut
    ;
    Siripongdee, Surapong
    ;
    Sunthonkanokpong, Wisuit
    This paper presents a voltage-mode shadow filter with single-input multiple-output (SIMO) configuration using voltage differencing differential difference amplifiers (VDDDAs). In this design, the low-pass and high-pass output functions of the single-input three-output second order filter are feedback via the voltage amplifier. The proposed filter consists of three VDDDAs, one grounded resistor and two grounded passive elements. The proposed filter uses grounded elements which is attractive for integrated circuit (IC) fabrication. It can simultaneously provide low-pass (LP), high-pass (HP), band-pass (BP), band-reject (BR) and all-pass (AP) responses without matching condition. The proposed circuit has high input impedance. The natural frequency (ω <inf>0</inf> ) and quality factor (Q) can be independently and electronically tuned by changing the external DC bias currents. The effect of the non-ideal and parasitic elements of the VDDDA is studied and investigated. The PSpice simulation and experimental results using CMOS technology and commercially available active devices are given to confirm the workability of the proposed filter.
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    Item type:Publication,
    Single Input Multiple Output Voltage Mode Universal Filters with Electronic Controllability Using Commercially Available ICs
    (2020-06-01)
    Pwint Wai, May Phu
    ;
    Jaikla, Winai
    ;
    Suwanjan, Peerawut
    ;
    Sunthonkanokpong, Wisuit
    This contribution presents the realization of commercially available ICs based single input voltage and three-output voltages universal second order filters with electronic controllability. Both proposed filters comprise two commercially available ICs LT1228, three passive resistors and two grounded passive capacitors. Two presented filters give low-pass (LP) voltage transfer function, band-pass (BP) voltage transfer function and high-pass (HP) voltage transfer function without modifying the scheme. The filtering parameters, center frequency (ω0) is tuned electronically as well as quality factor (Q) via controlling external DC bias currents. Moreover, the ω0 is linearly and electronically controlled without disturbing the Q by simultaneously changing bias currents. Using grounded capacitors are easy for the cancellation of parasitic element effects in LT1228s. The Pspice simulation and experimental results using integrated circuit, LT1228 are given to verify the filtering design.