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Explain briefly Barkhausen's criteria....

Explain briefly Barkhausen's criteria.

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If voltage feedback `V_(fb)` is derived from the output voltage `V_(0)` such that the fraction of feedback is `beta^(')` then `V_(fb) = beta' V_(0)`.
Let 'A' be the amplification such that
`A (beta' V_(0)) = V_(0)`
Hence, `beta`' A = 1. this is the condition for stable oscillation and is called Barkhausen's criteria.
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