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

Options

A. zera
B. `1/2`
C. 1
D. 2

Answer

C

Explanation

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