In an oscillator, for sustained oscillations, Barkhausen criterion is \mathrm{A} \beta equal to (\mathrm{A}= voltage gain without feedback, \beta= feedback factor )
A) zero
B) \frac{1}{2}
C) 1
D) 2
In an oscillator, for sustained oscillations, Barkhausen criterion is \mathrm{A} \beta equal to (\mathrm{A}= voltage gain without feedback, \beta= feedback factor )
A) zero
B) \frac{1}{2}
C) 1
D) 2

Answer is (A)
For sustained oscillations according to Barkhausen criteria. A \cdot \beta=1