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Subject: search.filters.subject.Signal flow graph

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    High-order chebyshev notch filter based on MO-OTA and its application in Biosensor
    (2021-05-19)
    Srisamranrungrueang, Siradanai
    ;
    Wongprommoon, Natapong
    ;
    Prommee, Pipat
    This paper presents a high-order notch filter based on multiple output OTA (MO-OTA). The signal flow graph (SFG) method is applied as a design procedure based on the RLC prototype. The RLC Chebyshev low-pass filter is used as an original prototype. The network transform is applied to convert the LPF to a notch filter. From the SFG, the denormalized network can be replaced by integrators and differentiators. The current-mode lossy and lossless types of integrator and differentiator are realized by using CMOS MO-OTA and grounded capacitor. A simple and low-complexity structure is achieved and constructed by 9 MO-OTAs and 6 grounded capacitors. The stop-band frequency between 10Hz-1kHz can be electronically tuned by the bias current between 1-100 μA. The low power supply ±0.75V is required which consumes the power 15mW at 100μA bias current. An application in ECG signal with power line interference (PLI) removal is included.
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    Realization of Tunable Fractional-order Device based on Ladder Network Approximation
    (2020-06-01)
    Prommee, Pipat
    ;
    Pienpichayapong, Peradol
    ;
    Manositthichai, Narongsak
    ;
    Wongprommoon, Natapong
    This paper describes a design and realization of a fractional-order device or constant phase element (CPE) using the approximation method. The rational function is applied for the fractional-order function. The rational function can be rewritten in the continue fraction expansions (CFE) form. The Cauer network type is realized from the CFE as RC ladder network. The signal flow graph (SFG) method is preferred to realize the active network from the passive RC ladder network. The finalized CPE requires the gains and integrators in voltage-mode. The OTAs are deployed as tunable active devices with grounded capacitors to realize the tunable fractional-order device. From the design procedure, the proposed CPE can be constructed in arbitrarily order and frequency operation. Moreover, the tunable of magnitude and frequency operation can be electronically tuned. The good agreement results of proposed CPE are carried out by PSpice compared to the theoretical expectation.
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    Vernier effect of multiple-ring resonator filters modeling by a graphical approach
    (2007-07-01)
    Saeung, P.
    ;
    Yupapin, P. P.
    We design and simulate a nonsymmetric vernier type of multiple ring resonator (MRR) filters to achieve wider free spectral range (FSR) with different ring radii. The expanded FSR is determined by the least common multiple of the FSRs of the individual ring resonators. The dependence of the transmission characteristics of the MRR on the coupling coefficients of directional couplers is studied. The improvement in suppression of interstitial resonances by using high-order vernier filters is also investigated. A graphical approach with a signal flow graph has been found very useful for quickly deriving the optical transfer functions of filters in the Z domain. © 2007 Society of Photo-Optical Instrumentation Engineers.