FreeLists / si-list / [SI-LIST] Re: matching within 1 mil

[steve weir <weirsi@xxxxxxxxxx>]

Jon as a number of people have pointed out, the electrical and physical 
lengths are not very close.  Material anisotropy alone causes skew 
typically of 3-10ps/inch, ie 2-6% of the run. 

Best regards,


Steve.
jon_powell37 wrote:
> When I see these rules to match within 10 mils (or n mils) I wonder who 
> much matching is really required in the electrical sims (or other 
> assumptions). Because I don't believe that matching physical length is 
> the same as matching electrical length. And the router only does 
> physical length. So the question is, "how close is electrical length to 
> physical length". I would be very suprized if the accuracy can be 
> expected to be better than the line width (call it 5 mils).
>
> So, if we are just making a "easy to understand" rule. Fine.
> But if it is a necessary rule. Not fine.
>
> Jon
>
>
>
>
>
> Disclaimer:
> The content of this message is my personal opinion only and although I
> am an employee of Intel, the statements I make here in no way represent
> Intel's position on the issue, nor am I authorized to speak on behalf of
> Intel on this matter.
>
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