Discussion
The condition of unity loop gain and zero net phase shift is the ______ criterion.
Answer: B
This is the Barkhausen criterion. Nyquist's test examines encirclement in the complex plane, Bode's is the straight-line magnitude and phase construction, and Hartley is an oscillator topology rather than a criterion at all. The same condition appears in the feedback amplifier topic as the thing to avoid and here as the thing to achieve, which is worth noticing since the mathematics is identical and only the intent differs.
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