Discussion
Consider the following statements about the Barkhausen criterion.
1. The loop gain must be unity in magnitude
2. The total phase shift around the loop must be zero or a multiple of a full turn
3. Both conditions must be satisfied at the same frequency
Which of the statements given above is or are correct?
Answer: A
All three are correct, and the third is the one most often left unstated even though it does the real work: it is the coincidence of the two conditions at one frequency that picks the oscillation out of the noise. A circuit meeting the gain condition at one frequency and the phase condition at another will not oscillate at either. Stating a criterion completely, including the conditions under which its parts must hold, is what makes it usable rather than merely quotable.
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