Discussion
What is meant by conditional stability?
Answer: D
A conditionally stable loop is stable as built but would oscillate if its loop gain were reduced, because the phase dips past inversion at a frequency where the gain is still above unity. The Bode margins can look adequate while the Nyquist plot reveals the problem, which is exactly the case simple rules of thumb fail on. Since gain falls as a circuit warms or ages, such a loop can become unstable in service.
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