Discussion
An amplifier oscillates at unity gain but is stable at a gain of ten. What does this indicate?
Answer: A
At unity gain the loop gain is at its largest, so the crossover frequency is highest and the accumulated phase greatest - the margin has run out there but not at a gain of ten. A faulty resistor would misset the gain rather than produce this pattern, low-frequency gain is wanted, and coupling capacitors act at the other end. That stability depends on the closed-loop gain is why devices are specified as unity-gain stable or not. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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