Stats

  • Locked Locked
  • Replies 7
  • Subscribers 166
  • Views 19641
  • Members are here 0
More Content
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

correct RF shield footprint, with parts inside

PascalVM

Hi, I have a footprint for a RF shield. I'm getting a lot of DRC errors "package to package spacing", basically for any part that is placed within the RF shield.

Here are screenshots. What would be the appropriate way to handle this footprint, so that it would not produce these errors?

.

  • eDave

    The simple answer is to add a PACKAGE_HEIGHT_MIN property to the place bound shape on the shield. This should be the minimum height of the "ceiling" of the shield. To be strictly correct you should have multiple place bound shapes on a shield because the minimum height for the walls differs from the rest.

  • jmadsenee
    in reply to eDave

    How do you use multiple place bound shapes?  I tried a place bound outside my shield with just a max height and then added another place bound inside the shield with a min height and I get the drc errors.  Adding the same max height to the inside place bound did not help.

  • CadAce2K

    If this is a two-piece shield (e.g. base and cover), be aware of rework issues. C13 and L2 would be a *** to rework with the cover off, since they are close to the base wall. Just a thought. Been there, done that.

  • steve
    in reply to jmadsenee

    The key here is setting both min and max height for all the place bound shapes. For the walls the min height could be zero and the max height would be the height of the wall (say 5mm). For the top cover set the min height to 5 and the max height to 6 (1mm thickness) and that will create the envelope. Take a look at:- orcad.co.uk/.../Height_definition.pdf there is a nice graphic that should help explain this.

Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.