Wisetphanichkij, Sompong

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Wisetphanichkij, Sompong
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sompong.wi@kmitl.ac.th

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    Item type:Publication,
    Minimal Realization Plus Current Output CC-based Biquad Circuit
    (2024-06-01)
    Wisetphanichkij, Sompong
    ;
    Angkeaw, Krit
    ;
    Sra-Ium, Napat
    This paper presents a minimal design of a biquad circuit using only one plus current output type-II current conveyor (CCII), one differential voltage current conveyor (DVCC) and grounded passive components. The circuit enables the implementation of all 5 basic filter types: low-pass (LP), band-pass (BP), high-pass (HP), band-stop (BS) and all-pass (AP) by selecting and adding input and output currents with no component matching constraints. Moreover, the circuit parameters ω<inf>0</inf> and Q can be set simply by adjusting the circuit components. The proposed biquad circuit performance has very low sensitivity to circuit components due to its simple structure and a small number of devices (2 active and 4 grounded passive components). This allows the circuit to work at high frequencies. Non-ideal and parasitic effects are investigated and discussed. The performance of the proposed topology was evaluated through PSPICE simulator using the 0.18 μm CMOS technology from the Taiwan Semiconductor Manufacturing Company (TSMC).
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    Linear Range Enhancement Circuit for LVDT based on Bipolar OTA with Relative Error Control
    (2022-01-01)
    Wisetphanichkij, Sompong
    This paper proposes a Linear Range Enhancement Circuit for Linear Variable Differential Transformer (L VDT) which was by inverse hyperbolic tangent function implemented by bipolar type OTA. The proposed circuit requires only 2 OpAmps, a bipolar-type OTA and a small number of passive elements. Furthermore, the mathematical models were used in the analysis to determine the configuration methods of the circuit to improve the linearity range enhancement techniques under controlled maximum relative error (%). Two configuration methods of relative error are 0% at center with flat top and ripple top with specific maximum relative error. The Pspice simulation results show the efficiency of the proposed technique for widening the linear operating displacement of the transducer up to 30mm for LVDT (ks = 50 v/m, and kn = 0.2) for 1 % of maximum relative error.
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    Item type:Publication,
    Minimal Realization Plus Current Output CC-based Biquad Circuit
    (2023-01-01)
    Wisetphanichkij, Sompong
    ;
    Angkeaw, Krit
    ;
    Sra-Ium, Napat
    This paper presents a minimal design of biquad circuit using only one plus current output type-II current conveyor (CCII), one differential voltage current conveyor (DVCC) and grounded passive components. The circuit enables all 5 basic filter types, low-pass (LP), band-pass (BP), high-pass (HP), band-stop (BS) and all-pass (AP) implementation by the selection and addition of the input and output currents with no component matching constraints. Moreover, the circuit parameters $\omega$0 and Q can be set simply by adjusting the circuit components. The proposed biquad circuit performance has very low sensitivity to circuit components due to its simple structure and small number of devices (2 active and 4 grounded passive components). This allows the circuit to work at high frequencies. The performance of the proposed topology was evaluated through PSPICE simulator using the 0. 1S$\mu$m CMOS technology from the Taiwan Semiconductor Manufacturing Company (TSMC).
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    Item type:Publication,
    Near Full Stroke Length Linear Range Enhancement Circuit for Linear Variable Differential Transformer (LVDT)
    (2023-01-01)
    Wisetphanichkij, Sompong
    This paper proposes a linear range enhancement circuit for Linear Variable Differential Transformer (LVDT). The nonlinear is compensated with a signal obtained from an inverse hyperbolic tangent function circuit and with the appropriate gain settings within the circuit. The efficiency of the proposed circuit depends on the accuracy of the signal obtained by the inverse hyperbolic tangent function circuit. The simulation results with Pspice® program demonstrate the efficiency of the proposed circuit for enhancing the linear operating distance of the transducer. Under a relative error a(%) of 2.2%, the linear operating range is improved from ± 9mm to ± 35mm for LVDT Kn=250(kn=0.1) at ± 37mm full stroke length, which is much wider compared to the signal obtained from the transducer before the improvement.