Е-Публикации
Технически университет - София

Abstract: This paper presents the structure and circuit design approaches for the amplitude stabilization of the sinusoidal output signal for a Wien-bridge oscillator using one and composite op-amps. Based on the performed theoretical analysis of both circuit configurations, analytical expressions for the self-oscillation conditions, nonlinear control of the output signal amplitude, and the frequency stability factor have been derived. As a result of the performed analyses and basic theoretical statements, a methodology for designing both circuit configurations of a Wien-bridge oscillator with a limiter circuit for amplitude control is presented. To verify the applicability of the proposed design methodology and the presented theoretical predictions, simulation studies and experimental testing of sample electronic circuits with the oscillations frequency up to 1MHz and the amplitude of the sine wave up to 10 $V$ are performed.

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