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Subject: search.filters.subject.Describing function

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    A sinusoidal nonlinear oscillator with adjustable frequency
    (2009-12-01)
    Hanmeng, Nithima
    ;
    Pranayanuntana, Poramate
    A sinusoidal nonlinear oscillator with adjustable frequency was studied. The frequency of oscillation was adjusted via the change of the center frequency of the second order band-pass filter, while keeping the quality factor constant. The describing function method was used to predict the limit cycles and to analyze the stability of oscillation. The proposed circuit consisted of two important parts in the feedback connection configuration: an operational transconductance amplifier (OTA) as a nonlinear element in feedback path; and a bandpass filter in the feedforward path. The experimental results were simulated by the ORCAD CAPTURE and MATLAB computer programs.
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    An electronically adjustable amplitude of OTA-based sinusoidal nonlinear oscillator
    (2009-11-18)
    Pranayanuntana, Poramate
    ;
    Khwankaew, Weerawat
    A systematic approach to adjust the amplitude of a sinusoidal nonlinear oscillator is discussed in this paper. Operational transconductance amplifier (OTA) and adjustable high-Q, second order bandpass filter are nonlinear element and linear element, respectively. The describing function method is used to find periodic solutions for nonlinear system. Experimental and simulation results are simulated using ORCAD CAPTURE, while, the numerical results are obtained using MAPLE and MATLAB. © 2009 IEEE.