OPA197 c-load stability

There are cases where a big fast load step makes it ring slew-rate limited, a dying sawtooth. Slew rate is a sort of bandwidth reduction; I think that's what's called a limit-cycle oscillation. The 1 uF case does that pretty obviously.

My loads on the split rail are actually tiny, basically biasing up some diffamps. But this instrument has real 16-bit resolution, or sometimes more, and a little crosstalk between channels might be noticed.

That I believe. I sort of suspect that it's the output current limit rather than the slew rate, but if it's some fancy-schmance architecture the SR might be set by something other than the pole-splitting cap and the tail current source on the input pair.

Cheers

Phil Hobbs