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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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  • jjones5617

    Yes, thank you, that does help.  I thought the padstack editor might be inventing its own origin for the antipad because it has an asymmetrical shape.  That's probably what it's doing.

    I've been able to draw keepout areas in Autocad (much easier than using the native Cadence drafting tools) and bring them into my part symbol, and the origins stay where I put them in Autocad even when the shapes aren't symmetrical.  But maybe the padstack editor works differently.

    I understand your procedure for using the vias and that makes sense to me.  I can do it the same way on my board.

    Thanks for your help with this.  I appreciate your taking the time to respond.

    John

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  • jjones5617

    Yes, thank you, that does help.  I thought the padstack editor might be inventing its own origin for the antipad because it has an asymmetrical shape.  That's probably what it's doing.

    I've been able to draw keepout areas in Autocad (much easier than using the native Cadence drafting tools) and bring them into my part symbol, and the origins stay where I put them in Autocad even when the shapes aren't symmetrical.  But maybe the padstack editor works differently.

    I understand your procedure for using the vias and that makes sense to me.  I can do it the same way on my board.

    Thanks for your help with this.  I appreciate your taking the time to respond.

    John

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