bharat wrote on Apr 13th, 2009, 8:53pm:Tosei,
The Io(s) is keep on varying from 2 mA to 10 mA. Therefore when you say VO(s) / Io(s), Io(s) is vriable.
Also, even if going for worst case Io(s); for pole location 10mA is worst case, for gain margin 2mA is worst case.
Hi bharat,
What you are suggesting as different levels of Io (2-10ma) are different quiescent points and correspond to large signal conditions. When referring to Io(s) I was referring to small signal conditions, which is the one that corresponds to consider when analyzing poles location, stability, etc.
Ideally such stability conditions should be analyzed for ANY possible quiescent point.
Hope this helps
Tosei