Question

In Wien's bridge oscillator, if \( R_1 = R_2 \) and \( C_1 = C_2 \), then the typical values of open loop gain and feedback factor to obtain the sustained oscillations are

• A. 1, 1
• B. \( \infty, 0 \)
• C. 1, \( \frac{1}{2} \)
• D. \( \frac{3}{2}, \frac{1}{3} \)

Hint:

For a Wien's bridge oscillator, remember the standard values of \( A = \frac{3}{2} \) and \( \beta = \frac{1}{3} \) for sustained oscillations.

Answer 1

The Correct Option is D

In a Wien's bridge oscillator, to sustain oscillations, the open loop gain (\( A \)) must be equal to 3/2, and the feedback factor (\( \beta \)) should be 1/3. This ensures that the phase shift and amplitude conditions for sustained oscillations are satisfied. Therefore, the correct answer is option (4).