Discussion
How many poles below the unity-gain frequency can a loop tolerate?
Answer: B
One pole gives ninety degrees at most and so is unconditionally stable, while a second pole approaching its own break pushes the phase towards inversion and the margin disappears. Three is worse still, and a high gain makes matters worse rather than better by pushing the unity-gain frequency higher. The whole of dominant-pole compensation is an arrangement to make sure only one pole is encountered before the gain has gone. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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