Electronic Devices and Circuits - Engineering

Q1:

Barkhausen criterion of oscillation is

A Aβ > 1

B Aβ = 1

C Aβ = < 1

D Aβ ≤ 1

ANS:B - Aβ = 1

Barkhaussen criterion states that AB >=1.

If AB>1 then oscillations will start from small oscillations eventually getting to bigger oscillations.
If AB=1, then oscillations are constant, thus, when no oscillations are already present, no oscillation can happen.