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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