Howdy, Stranger!
It looks like you're new here. If you want to get involved, click one of these buttons!
Quick Links
DRC on curved features
Hi all,
First, this is an excellent tool and I have been using KLayout for years now as a MEMS layout tool. I am now expanding my use by including trace net functionality as well as DRC rule checking and looking forward to implementing these techniques through a technology file next.
While Trace Net has been working well, I have been having some trouble defining my DRC rules properly especially with respect to rounded shapes. Perhaps I am not fully understanding how some of the DRC functions are implemented so am looking for some advice. For example, if I make the shape shown here: http://www.klayout.de/doc-qt4/images/drc_rounded_corners.png and DRC script as follows:
report ("DRC Check")
input(1).width(2.um).output("Metal1_width", "Minimum Metal 1 Width Violations")
My report database finds 18 errors, all of which are found in the curved part at the two tips on the left and right. I think I should use bbox but I'm not sure if this is the proper way to address the width test. I've seen some references to sizing but I don't understand how that could help in this case.
Thank you for all your help and apologies if this was answered elsewhere in the forum or documentation!
First, this is an excellent tool and I have been using KLayout for years now as a MEMS layout tool. I am now expanding my use by including trace net functionality as well as DRC rule checking and looking forward to implementing these techniques through a technology file next.
While Trace Net has been working well, I have been having some trouble defining my DRC rules properly especially with respect to rounded shapes. Perhaps I am not fully understanding how some of the DRC functions are implemented so am looking for some advice. For example, if I make the shape shown here: http://www.klayout.de/doc-qt4/images/drc_rounded_corners.png and DRC script as follows:
report ("DRC Check")
input(1).width(2.um).output("Metal1_width", "Minimum Metal 1 Width Violations")
My report database finds 18 errors, all of which are found in the curved part at the two tips on the left and right. I think I should use bbox but I'm not sure if this is the proper way to address the width test. I've seen some references to sizing but I don't understand how that could help in this case.
Thank you for all your help and apologies if this was answered elsewhere in the forum or documentation!
Comments
https://www.klayout.de/forum/comments.php?DiscussionID=832
Hi all,
for curved structures, the width is probably quite sensitive to rounding issues: depending on the resolution of your curves certain edges or parts of those may have a smaller distance than allowed.
But to continue this discussion, a picture would be helpful. This forum does not allow attachments, but you can upload a picture to dropbox or any other place and paste the URL here.
Regards,
Matthias