Prommee, Pipat

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Prommee, Pipat
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Prommee, P.
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pipat.pr@kmitl.ac.th

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    OTA-based tunable fractional-order devices for biomedical engineering
    (2021-01-01)
    Prommee, Pipat
    ;
    Pienpichayapong, Peradol
    ;
    Manositthichai, Narongsak
    ;
    Wongprommoon, Natapong
    This research realizes fractional-order devices or constant phase element (CPE) using continued fraction expansion (CFE) and rational function approximation methods. An RC ladder network prototype was realized using CFE based on the Cauer network principle. The RC ladder network and signal flow graph (SFG) were employed to realize the proposed CPE. Voltage gain circuits and voltage-mode integrators were realized by using operational transconductance amplifiers (OTA) and grounded capacitors. The proposed CPE was subsequently synthesized using voltage gain circuits and voltage-mode integrators based on SFG. The proposed CPE could function as fractional-order capacitor and fractional-order inductor. Besides, the CPE could be constructed in arbitrary fractional-orders. The impedance and operation frequency are independently tunable by manipulating OTA bias current. To validate, the proposed fractional-order device was applied to six types of electrical Cole models of skull tissues, and simulation results were compared with the approximation function and theory. The electrical characteristics of the Cole models based on the proposed CPE are comparable to the theoretical characteristics of the Cole model.
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    Reconfigurable Fractional-Order Operator and Bandwidth Expansion Suitable for PIαController
    (2024-05-01)
    Prommee, Pipat
    ;
    Pienpichayapong, Peradol
    This article presents a reconfigurable fractional-order operator circuit with a bandwidth expansion technique for applications such as automation and robotics. The advantages of continued fraction expansion (CFE) and Newton-Raphson's methods are amalgamated to achieve three high-accuracy first-order bilinear functions. By adding two bilinear functions (fifth-order approximation), the bandwidth expansion technique is provided. In contrast to conventional approximation techniques, this novel technique can provide a wide bandwidth of up to four decades and errors better than 20%. This technique also enables extended bandwidth by adding more bilinear functions. The circuit realization can be easily constructed by cascading the factorized first-order bilinear functions. The proposed fractional-order operator can be reconfigured between the differentiator and the integrator using a selector switch without changing any circuit topology. The fractional-order operator's frequency response (ω) and order (α) can be independently tuned using the bias current. The fractional-order proportional-integral (PIα) controller in the throttle and brake of autonomous vehicles is investigated to confirm the performance compared with the theoretical results. The experimental results based on commercially available operational transconductance amplifiers are validated and found to be in agreement with the theoretical analysis. Therefore, it can pave the way for further programmable system-on-chip for industries.
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    Fractional-order Sinusoidal Oscillator with Arbitrary Phase Fining and Orthogonally CO and FO
    (2022-01-01)
    Pienpichayapong, Peradol
    ;
    Wongprommoon, Natapong
    ;
    Prommee, Pipat
    This work presents a new fractional-order sinusoidal oscillator (FSO) based on OPAMP. The original circuit consists of two fractional-order lossless integrators (FLI) and some basic circuits. The RLC Foster approximation is used to realize the fractance capacitors. The CO and FO can be independently tuned. The order of passive device (a) is also orthogonally with CO and FO. In addition, the phase fining technique of the proposed FSO can easily be modified by replacing a couple of FLI with the existing FLL The characteristics of the circuit work well agreed with the original one. PSpice carries out the simulation results based on the model LF347 OPAMP. The results are in good agreement with the theoretical.
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    Tunable Elliptic High-pass Filter based on Differentiator Approach
    (2020-09-23)
    Wongprommoon, Natapong
    ;
    Pienpichayapong, Peradol
    ;
    Prommee, Pipat
    This article presents a design of high-order Elliptic ladder high-pass filter based on differentiators and integrator approach. Since the design of general Elliptic high-pass filter can be realized with high complexity, moreover the high-pass filter held very complicated design. The differentiators and integrator are deployed for synthesis high-pass filter from its Signal Flow Graph (SFG). The Elliptic RLC high-pass filter is transformed by using the original Elliptic RLC low-pass filter. The SFG is straightforward analyzed from the Elliptic RLC high-pass filter prototype. The SFG describes three differentiators and one integrator. The operational transconductance amplifiers (OTA) and grounded capacitors are preferred to implement the differentiators and integrator. The proposed filter contains only 7 OTAs with 4 grounded capacitors. The frequency responses can be varied between 100kHz and 10MHz by manipulating the bias current (IB) from 1μA to 100μA. The performances and the capability are carried out by using PSpice simulation which agreed to the theory.
      1
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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.
      1