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Author: search.filters.author.Manositthichai, NarongsakSubject: search.filters.subject.Elliptic

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    Simple structure OTA-C elliptic band-pass filter
    (2019-07-01)
    Prommee, Pipat
    ;
    Wongprommoon, Natapong
    ;
    Khateb, Fabian
    ;
    Manositthichai, Narongsak
    This paper presents a new Elliptic ladder bandpass (BP) filter based on MO-OTA. This RLC ladder low-pass (LP) prototype and network transformation are used to create the band-pass signal flow graph (SFG). From SFG, the integrators and differentiator are required to realize the BP Elliptic filter with low-complexity configuration. The integrator and differentiator circuits can generally be obtained based on OTA-C technique. Lossy and lossless integrators and differentiators based on MO-OTA(s) are straight-forward applied to SFG for achieving the designed filter. Based on this technique, the circuit is obviously apparent that the final circuit has low-complexity and low-component count compared with the conventional technique. This proposed BP Elliptic filter contains only 10 bipolar MO-OTAs and 8 grounded capacitors. The frequency responses can be tuned between 2kHz and 100kHz through the bias currents of OTA. The simulation results are carried out by PSpice and agreed well with theory anticipation.
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    OTA-C based compact Low-pass Elliptic Filter
    (2018-12-24)
    Wongprommoon, Natapong
    ;
    Manositthichai, Narongsak
    ;
    Prommee, Pipat
    This article described a compact structure simulating electronically controlled high-order Elliptic filter based on OTA-C. The signal flow graph (SFG) is deployed as a synthesis method from RLC prototype. The synthesis of Elliptic filter using SFG is normally required the integrators and very low current/voltage gain. This proposed filter is synthesized by using SFG and no required any current/voltage gains. From its SFG, the OTA-C based integrators and differentiators can be realized. The completed circuit is using only grounded capacitors with low-complexity structure. The frequency response of proposed filter can be tuned through the equality of OTA's bias currents. The supply voltage is using ±. The comparison of proposed filter and RLC prototype characteristics are verified by PSpice that the results are in good agreement.