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The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> Mimcap mismatch in 65nm TSMC https://designers-guide.org/forum/YaBB.pl?num=1281127713 Message started by carlgrace on Aug 6th, 2010, 1:48pm |
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Title: Mimcap mismatch in 65nm TSMC Post by carlgrace on Aug 6th, 2010, 1:48pm Hi all, I'm simulating some matched MIMCAP capacitors using eldo in TSMC 65nm. I'm getting some variation using monte carlo, but not as much as I would expect. Namely, I would expect the caps (based on their sizes) to match to about 0.1%, but the settling value in the switched-cap amplifier I'm simulation is within more like 0.01%. Am I doing something wrong? I'm setting mismatchflag=1 and it looks like I'm getting *some* mismatch, just not as much as I supposed. Carl |
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Title: Re: Mimcap mismatch in 65nm TSMC Post by pancho_hideboo on Aug 7th, 2010, 3:00am I can't find out any design issue in your post. carlgrace wrote on Aug 6th, 2010, 1:48pm:
Confirm std-deviation of MIMCAP as a result of MonteCarlo Trials. |
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Title: Re: Mimcap mismatch in 65nm TSMC Post by Alexandar on Aug 12th, 2010, 1:41am Can you isolate the problem by only adding mismatch on capacitors and then verify the result? Maybe you can play with the simulators tolerances, to ascertain you're not looking at numerical noise. 0.01% is quite small to be honest. |
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Title: Re: Mimcap mismatch in 65nm TSMC Post by carlgrace on Aug 17th, 2010, 6:42pm Turns out installing an updated version of the kit fixed the problem. Weird. Thanks for the replies. Carl |
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Title: Re: Mimcap mismatch in 65nm TSMC Post by loose-electron on Aug 26th, 2010, 5:10pm carlgrace wrote on Aug 17th, 2010, 6:42pm:
Weird? Nope, just bad models. Not to be surprised. |
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