Question

In an oscillator, if $A$ is the feedback factor and $A'$ is the gain of amplifier, then sustained oscillations are obtained when

• A. $\frac{A}{\beta} = 1$
• B. $A\beta<1$
• C. $A\beta = 1$
• D. $A\beta>1$

Hint:

The Barkhausen criterion requires $A\beta = 1$ for sustained oscillations in feedback circuits.

Answer 1

The Correct Option is C

Step 1: Condition for sustained oscillations.
For sustained oscillations, the condition for feedback oscillators is:
\[ A\beta = 1 \] where $A$ is the amplifier gain and $\beta$ is the feedback factor.

Step 2: Conclusion.
Sustained oscillations are obtained when $A\beta = 1$.