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Rigid-Flex Design

HSID

I am designing a board which will have three flex tails connected to a rigid pcb.

Do I need to create three flex stackups, one for each tail.

Or can I just create the Primary stackup for the rigid boad and one stackup for the three tails connected to the rigid board.

The signals running on the flex tails will all be on the same two inner layers.

  • Good questions. I just checked the Cadence site and they have a lot of information regarding this, and it looks easy (I doubt in reality it is). You can check this YouTube vid for reference (https://www.youtube.com/watch?v=9eB5ZDS1QQw). Quick-n-dirty, but it might strike your interests. I've done flex circuits with Allegro before, but not the rigid-flex you're mentioning. Should be a good project.

    As always, make sure you get your flex provider (fabricator) involved from the beginning. There is much to learn from their expertise.

    Good day.

  • in reply to CadAce2K

    Thanks for the video link! One other question, have you actually used the import/export function in the stackup editor for flex or any type of designs.

    I would like to be able to import or even export out the stackup from or to our pcb vendor.

    It would be great if I could import in their stackup and be done with it. One vendor said they do not use IPC2581.

    Thanks again.

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