[ivanchi]

Hi

The layout file can be imported into a block in Icepak, like substrate or PCB.

But I found the Grid Density of the layout file plays an important role in the results, I have tried grid 100x100 200x200 ....... 2000x2000.

There are so much larger difference between these cases.
I think the grid density is base on how large of the package or PCB.

Does someone have the Guideline for grid density of imported layout file?

thanks!

[Jupudi.pramodh]

Hi,

As you mentioned, Grid density plays an important role in predicting the results in case we've imported traces of a PCB (into a block representing PCB). The finer the PCB, the more time solver takes to calculate the metal fractions.

I guess the default values set in Icepak would be 200X200. depending on size of your grid and traces, we'll have to alter the values. As far as i've experienced, I was using 750x750 as grid density and didn't find much difference on still finer numbers.

Any ways, just the way we do mesh optimization study (Grid independent study), performing a couple of iterations to freeze the grid density would be a safe practice..

Cheers,
Pramodh J