Discussion
Why does raising the loop gain make a marginal loop worse?
Answer: C
More loop gain pushes the frequency at which the gain falls to unity further up the response, where more poles have taken effect and the phase has shifted further. The poles themselves do not move and the phase at a given frequency is unchanged. This is why an amplifier stable at a closed-loop gain of a hundred can oscillate at unity gain, and why data sheets specify the minimum gain at which a device is stable.
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