Discussion
Why is a unity-gain follower the hardest case for stability?
Answer: D
With the whole output returned, the feedback fraction is one and the loop gain equals the open-loop gain, so unity loop gain occurs at the highest possible frequency. The network's impedance and the input impedance are not the issue, and the output current depends on the load. A device described as unity-gain stable has been compensated for exactly this worst case, which is why it is slower than an uncompensated one used at higher gain. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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