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Electronic Devices & CircuitsOscillators

For sustained sinusoidal oscillation, the Barkhausen criterion requires the magnitude of loop gain to be approximately unity and total loop phase shift to be?

  • A0 degrees or an integer multiple of 360 degrees
  • B90 degrees only
  • C180 degrees only regardless of inversion
  • D45 degrees only
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Correct Answer: A. 0 degrees or an integer multiple of 360 degrees
Explanation: At the oscillation frequency, positive regenerative feedback requires |Aβ|≈1 and net loop phase 0° modulo 360°.
Reference: Standard analog electronics: Barkhausen criterion
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