Answer – C. Both Aβ>1 and the phase shift around the feedback network must be 00.
The answer to the question, which of the following is required for oscillation is Both Aβ >1 and the phase shift around the feedback network must be 00.
To determine the oscillation in the linear electronic circuit, we need to satisfy one criterion which is known as the Barkhausen stability criterion which is applied to linear circuits with a feedback loop. |Aβ| ≥ 1 and phase shift around the loop is zero or multiple integers of 2π.
Barkhausen's criterion is a necessary condition for oscillation but not a sufficient condition: some circuits satisfy the criterion but do not oscillate.
Therefore, the required conditions for oscillation are Both |Aβ| ≥ 1, and the phase shift around the feedback network must be 00. Hence, Option (C) is the correct answer.