In an oscillator, for sustained oscillations, Barkhausen criterion is `Abeta` equal to (A = voltage gain without feedback and `beta` = feedback factor)

Options

A. zero
B. `(1)/(2)`
C. 1
D. 2

Answer

C

Explanation

According to question, Barklhausen criterion states that if A is the gain of the amplifying element in the circuit and B is the gain of the amplifying element in the circuit and B is the transfer function of the feedback path, then condition of sostained oscillation is given by `|betaA|=1`
So, option (c) is correct.