Barkhausen stability criterion

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The Barkhausen stability criterion was put forth by German physicist Heinrich Georg Barkhausen (1881-1956) for sustained oscillations and it states that:

  1. The loop gain of the oscillator circuit must be greater than or equal to unity, that is, \beta A \ge 1, where β is the gain of the feedback network and A is the voltage gain of the oscillator circuit.
  2. The phase shift around the circuit must be zero or an integer multiple of 2π.


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