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Oscillator Operation
Barkhausen Criterion
When the positive feedback circuit has the following conditions:
  1. βA = 1 and
  2. the total phase shift around the loop is 0° or multiple of 360°,
it behaves as an oscillator. The above conditions for oscillation are called Barkhausen Criterion for oscillation. As βA is a complex quantity, mathematically the Barkhausen Criterion is represented by
βA = 1 + j0

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