Jul 1, 2015 #1 D dahuangpeng Newbie level 5 Joined May 14, 2015 Messages 9 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 60 when i did the ac simulation for a ldo,i find a funny problem. when i break the loop at the op input of feedback, i have a PM about 80. when i break the loop at the op output,i have a PM about 30, and the main pole become bigger, why was it happend.
when i did the ac simulation for a ldo,i find a funny problem. when i break the loop at the op input of feedback, i have a PM about 80. when i break the loop at the op output,i have a PM about 30, and the main pole become bigger, why was it happend.
Jul 1, 2015 #2 FvM Super Moderator Staff member Joined Jan 22, 2008 Messages 52,444 Helped 14,754 Reputation 29,790 Reaction score 14,109 Trophy points 1,393 Location Bochum, Germany Activity points 298,207 A better question title would be "how to measure loop gain correctly?". There are various previous threads, see the "similar threads" tab below. You can also google for Middlebrook's method of loop gain analysis.
A better question title would be "how to measure loop gain correctly?". There are various previous threads, see the "similar threads" tab below. You can also google for Middlebrook's method of loop gain analysis.