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    Three-Phase Oscillator with Cascade Ability Using Voltage Current Conveyor
    (2024-01-01)
    Buakaew, Seangrawee
    ;
    Narksarp, Wipavan
    ;
    Choeysombat, Kamonthip
    ;
    Kanjanawiwin, Juthamas
    ;
    Atiwongsangthong, Narin
    This paper presents a new circuit configuration employing voltage current conveyors (VCII) in conjunction with a minimal number of passive elements to achieve a voltage mode sinusoidal oscillator with a 3 -phase differential output. The proposed circuit features a straightforward architecture, with all passive elements connected to low-impedance nodes. Consisting solely of identical VCIIs without multiple outputs, the circuit facilitates the cascading of the 3 -phase outputs without requiring supplementary buffering. Simulation results obtained through PSPICE, along with experimental validation using commercial ICs, are provided to substantiate the efficacy of the proposed circuit.
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    Compensation of Temperature Effect for LVDT Transducer
    (2018-11-01)
    Petchmaneelumka, W.
    ;
    Rerkratn, A.
    ;
    Luangpol, A.
    ;
    Riewruja, V.
    In this paper, a circuit technique to compensate the temperature effect in the output signal of the linear variable differential transformer (LVDT) is presented. The realization technique is based on the proposed feedback configuration to minimize the active component used in the circuit. The subtraction and sum schemes are provided instead of the error detector used in the traditional feedback loop. The feedback signal is obtained from two secondary winding signals of LVDT. The proposed feedback technique requires only the proportional control action to minimize the error caused by the variation of the ambient temperature. The sensitivity of LVDT is unaffected from the proposed compensation technique. The performances of the proposed technique are discussed in detail and confirmed by experimental implementation using the commercial devices. The maximum percentage error can be reduced from 6.52% of the LVDT output signal without temperature compensation to 0.05% of the proposed technique for the ambient temperature varied from 25°C to 70°C. The purpose of the proposed technique is emphasized in terms of high performance, simple configuration and low cost.