Answer Posted / abdul quadir khumnai

Closed Loop GAIN in presence of POSITIVE FEEDBACK can be
calculate by fomula = Av` = Av/(1-β.Av)

Where,
Av` = closed loop gain.
Av = open loop gain.
β = is feedback ratio

So, according to Barkhausan Criterion

(1) If "β.Av" becomes "unity" i.e., "1". Then, Gain tends to
infinity and Oscillation starts.

(2) and angle between "β" and "Av" must be "0° or 360°"

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