Jul 5, 2008 #61 leo_o2 Advanced Member level 4 Joined Sep 3, 2004 Messages 1,322 Helped 278 Reputation 558 Reaction score 241 Trophy points 1,343 Location China Activity points 5,761 What's the structure for your buffer? It is simple source follower or other structure. I am interested in your compensation cap. Please keep in mind some compensation cap will introduce hidden loops.
What's the structure for your buffer? It is simple source follower or other structure. I am interested in your compensation cap. Please keep in mind some compensation cap will introduce hidden loops.
Jul 5, 2008 #62 E elmolla Full Member level 2 Joined Jul 14, 2005 Messages 132 Helped 20 Reputation 40 Reaction score 2 Trophy points 1,298 Activity points 2,721 What do you mean by some compensation cap will introduce hidden loops?
Jul 5, 2008 #63 A ashish_chauhan Full Member level 5 Joined Sep 2, 2007 Messages 266 Helped 48 Reputation 96 Reaction score 9 Trophy points 1,298 Activity points 2,674 some thing like Cgd in a mosfet... I mean though its not a compensation cap... but its kind of feedback... and miller is something similar
some thing like Cgd in a mosfet... I mean though its not a compensation cap... but its kind of feedback... and miller is something similar
Jul 6, 2008 #64 E elmolla Full Member level 2 Joined Jul 14, 2005 Messages 132 Helped 20 Reputation 40 Reaction score 2 Trophy points 1,298 Activity points 2,721 I'm using a buffer connected OTA
Jul 7, 2008 #65 E elbadry Full Member level 6 Joined May 6, 2005 Messages 347 Helped 72 Reputation 144 Reaction score 10 Trophy points 1,298 Location Egypt Activity points 3,884 Is this a single-ended or fully differential Opamp? I am sure you know this well, but just a reminder: if it's a fully differential design then the CMFB loop can be oscillating. Is this the case?
Is this a single-ended or fully differential Opamp? I am sure you know this well, but just a reminder: if it's a fully differential design then the CMFB loop can be oscillating. Is this the case?
Jul 8, 2008 #66 Q quaternion Full Member level 4 Joined Nov 12, 2006 Messages 212 Helped 17 Reputation 34 Reaction score 7 Trophy points 1,298 Location Cairo , Egypt Activity points 2,828 Most probably it isn't a fully differential diff pair, it isn't used as an input stage of LDO EA , is it ?
Most probably it isn't a fully differential diff pair, it isn't used as an input stage of LDO EA , is it ?
Jul 8, 2008 #67 E elmolla Full Member level 2 Joined Jul 14, 2005 Messages 132 Helped 20 Reputation 40 Reaction score 2 Trophy points 1,298 Activity points 2,721 The buffer is a single ended OTA. It is used to drive the pass device, not the EA.
Jul 8, 2008 #68 N newbiedes Newbie level 6 Joined Jul 7, 2008 Messages 11 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,336 Are you still getting oscillations... ... like in one of ur previous posts u said you have found the solution... And did you look for the pole zero plot?
Are you still getting oscillations... ... like in one of ur previous posts u said you have found the solution... And did you look for the pole zero plot?
Jul 8, 2008 #69 E elmolla Full Member level 2 Joined Jul 14, 2005 Messages 132 Helped 20 Reputation 40 Reaction score 2 Trophy points 1,298 Activity points 2,721 I don't have oscillations now, after I've done the solution or it wouldn't have been a solution . I didn't do yet the pole-zero plot, but its on my schedule.
I don't have oscillations now, after I've done the solution or it wouldn't have been a solution . I didn't do yet the pole-zero plot, but its on my schedule.
Jul 16, 2008 #70 K kisspig_84630 Newbie level 5 Joined Jul 14, 2008 Messages 9 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,307 need it ,thanks!!