Question

in an oscillation amplifier gain is 50 what is the necessary feedback factor better to start the oscillation
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Answer 1

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The loop gain Ap should be greater than 1 to start the oscillations.

hope it helps

Answer 2

Question: In an oscillator, for sustained oscillations, the Barkhausen criterion is Aβ equal to (A = voltage gain without feedback, β = feedback factor)

Answer: 1

Explanation:

• In an oscillator, Barkhausen criterion Aβ is equal to $1$, because for this condition only the output voltage is sine wave under steady-state condition.
• If Aβ is zero, then the product of Aβ and input voltage$(v_{in})$ will also be zero.
• If Aβ  $< 1,$then the product, Aβ$v_{in}$ is less than $v_{in}$, and the output signal will die out.
• If Aβ$> 1$, then the product, Aβ$v_{in}$ is greater than $v_{in}$ , and the output signal will build up gradually (i.e. unsteady).

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