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Electronic Devices & CircuitsOscillators

For sustained sinusoidal oscillations, the Barkhausen criterion requires the loop-gain magnitude to be approximately unity and the net loop phase shift to be?

  • A0 degrees or an integer multiple of 360 degrees
  • B90 degrees only
  • C180 degrees only regardless of feedback sign
  • D45 degrees
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Correct Answer: A. 0 degrees or an integer multiple of 360 degrees
Explanation: At the oscillation frequency, the loop must provide positive regenerative feedback: |A beta| ≈ 1 and total loop phase shift 0 degrees modulo 360 degrees.
Reference: Standard analog electronics: Barkhausen criterion
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