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Differential Pairs

melview1

Using OrCAD PCB Designer v16.3.S009

Can anyone help me on how to route a differential pair to be the same length and same separation during the whole route?  I'm sure there's some properties or modes I am missing that makes this easier than doing it manually.

Thanks.

 

--Mark

  • redwire

    Constraint manager: set up the differential pair definition.  Then assign the net pair to that definition.  It will route automatically to your width + spacing requirements.

  • melview1

    I don't have a lot of experience with constraing manager.  I've been in it, but I'm not quite sure where I define distances between 2 nets.  Could I bother you for a bit more detail?

    Thanks.

    --Mark

  • oldmouldy

    You would need at least an Allegro PCB Design L license to get the necessary entries for differential pairs to appear in the Constraint Manager, the OrCAD PCB Designer has no native support for differential pairs.

    With Allegro PCB Design L, there is an additional Electrical domain in the Constraint Manager, this allows for the setting of the differential pair constraints.

  • melview1

    Well that sucks.  I guess I'll have to route them manually then.

    Thanks for the info.

     

     --Mark

     

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