Jaikla, Winai

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Jaikla, Winai
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Jaikla, W.
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winai.ja@kmitl.ac.th

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    Electronically Tunable Quadrature Sinusoidal Oscillator Using VDDDAs
    (2021-03-10)
    Satipar, Den
    ;
    Intani, Pattana
    ;
    Jaikla, Winai
    This research proposes the sinusoidal oscillator that can provide two sine waves with 90° degree phase shift. The proposed oscillator is derived from lossy and lossless integrator circuits. The proposed quadrature sinusoidal oscillator uses one resistor, two grounded capacitors and two active elements, called voltage differencing differential difference amplifier (VDDDA). By adding additional two resistors, the voltage magnitude of a sinusoidal signal is controllable with low impedance output voltage node. The frequency of the generated sine wave and the condition of oscillation is orthogonally adjusted. In addition, the condition of the signal generator can be adjusted electronically. The performance of the presented sine wave generator has been validated through Pspice simulation. The active element, VDDDA is implemented from two commercial ICs, LM13700 and AD830.
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    Electronically Tunable Quadrature Sinusoidal Oscillator with Equal Output Amplitudes during Frequency Tuning Process
    (2017-06-21)
    Satipar, Den
    ;
    Intani, Pattana
    ;
    Jaikla, Winai
    A new configuration of voltage-mode quadrature sinusoidal oscillator is proposed. The proposed oscillator employs two voltage differencing current conveyors (VDCCs), two resistors, and two grounded capacitors. In this design, the use of multiple/dual output terminal active building block is not required. The tuning of frequency of oscillation (FO) can be done electronically by adjusting the bias current of active device without affecting condition of oscillation (CO). The electronic tuning can be done by controlling the bias current using a digital circuit. The amplitude of two sinusoidal outputs is equal when the frequency of oscillation is tuned. This makes the sinusoidal output voltages meet good total harmonic distortions (THD). Moreover, the proposed circuit can provide the sinusoidal output current with high impedance which is connected to external load or to another circuit without the use of buffer device. To confirm that the oscillator can generate the quadrature sinusoidal output signal, the experimental results using VDCC constructed from commercially available ICs are also included. The experimental results agree well with theoretical anticipation.
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    Quadrature Sinusoidal Oscillator with Grounded Resistors and Capacitors Using VDCCs
    (2021-03-10)
    Satipar, Den
    ;
    Intani, Pattana
    ;
    Jaikla, Winai
    This paper presents the quadrature oscillator using voltage differencing current conveyors (VDCCs)-based on the LC circuit parallel to the positive and negative resistors. In this design, two active devices, VDCC is constructed with two grounded capacitors and three grounded resistors. The sine waves are obtained both voltage and current mode. It can generate quadrature sinusoidal voltage output and two current outputs with amplitude controllability. Two current outputs with high impedance are180ºdegree phase difference are also obtained. Adjusting the condition and frequency of signal generation can be done independently via electronic feature. The total harmonic distortion is less than 0.97 % and power consumption at a maximum frequency of 1.12MHz is 1.82mW at power supply voltages ±0.9 V. The workability of the circuit is verified by PSPICE.