Second, I know a "bad" phase margin will manifest itself for a unity
gain amplifier, but would it also affect lower gains such as 2, 3,
etc?
iserver3 has been good to me so far.
If you're going to have problems with phase margin, most likely they
will occur for a gain of 1, but that's not *always* true, which is why
I want you to test at 1 and 16.
ksjp