Process parameters statistic description: where?

Hi everybody,

here's my question: in a former (BiCMOS) process I've been designing with, I used to size resistors and (especially) MOS devices also based on matching parameters, namely using a

\[\sigma = \frac{\sigma_A}{Area}\]

type of expression to evaluate the needed area in order to stay under a target spread. I could retrieve this information from the Design Rule Manual.

Now, I have changed Company and technology

Also the fab providing the tech node - now TSMC - is new to me (strange as it may sound 8-O)

That is to say that maybe things are organized differently...But I am expecting to find some equivalent information also for the two nodes I am looking into right now, namely 180nm and 65nm CMOS. Of course I am forwarding this same topic to my fellows inside my Company, but I'd nevertheless like to gather some experience from you.

Is it customary in TSMC processes to have these \[\sigma\] written somewhere for process parameters like \[V_T\] ,\[ \frac{\Delta{L}}{L}\] , ...
or it is a somewhat obsolete/unapplicable concept? I'd really like to avoid resorting to MC runs to get this type of information...

Thanks for any suggestion,

Michele

Hi Michele,

I don't have any TSMC PDK, but in my other foundries' PDKs this info always could be found in the Spice / Spectre files.

Rgds, Erik L.

erikl said:

Hi Michele,

I don't have any TSMC PDK, but in my other foundries' PDKs this info always could be found in the Spice / Spectre files.

Rgds, Erik L.

Click to expand...

Hi Erik ;-)

I assume you're talking about the Spice Models Documentation that goes with the PDK, not the .scs files themselves (because they do contain of course this information but it is...well...a bit encrypted )
In fact, I did find this morning the sigma values I was looking for, for my 0.18um, exactly in those Spice Model Doc files. For 55nm things are however a bit different: instead of ONE Spice Model Doc, I saw referenced at least three 8-O.
In the only one I could find in my documentation, there were no such data, but a redirection to another doc for "more precise information"...I've asked for these docs to my CAD guys as I don't seem to have it.
Still diggin'

Michele