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Complex antipad shape

jjones5617

Hello,

I need to create a padstack with a complex antipad shape on the signal ground layer (for signal integrity).  The shape is easy to draw in autocad, so I did it there.  In the Cadence editor, complex shapes are, well, complex, in my experience.

Can I import the DXF file I created from Autocad an use it as an antipad in my padstack?  If so, how do I go about it?  I've tried importing the DXF file into a shape symbol.  It goes on the top etch layer.  Then when I try use this as an antipad, it tells me that the symbol offset is outside the padstack extents and I can't modify the shape offset.

I'm probably just doing things in the wrong order.  Has anyone ever done what I'm trying to do successfully?

Thanks,

John

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  • redwire

     Glad to finally see others getting advanced antipads in their designs.  We've been doing it for years and your method is spot on.  We use a custom antipad on each layer for a specific stackup.

    You need to tweak the origin of the complex shape over in the shape -- just use the design setup menu.  One of the issues with the padstack editor is cacheing so what I do is name each revision of the complex pad with name_n where n increments and Allegro replaces everything.  Once it's all working I clean up what I need to and enter everything in the master library.

     

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  • redwire

     Glad to finally see others getting advanced antipads in their designs.  We've been doing it for years and your method is spot on.  We use a custom antipad on each layer for a specific stackup.

    You need to tweak the origin of the complex shape over in the shape -- just use the design setup menu.  One of the issues with the padstack editor is cacheing so what I do is name each revision of the complex pad with name_n where n increments and Allegro replaces everything.  Once it's all working I clean up what I need to and enter everything in the master library.

     

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