Re-size and Re-space of differenetial pairs

Hi. Are you using the Constraint manager to do this? Are you using this sheet: 

You can find tips to work with differential pairs here: 

Article (20416966) Title: Tips for using differential pairs in Allegro
URL: https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od000000050XBEAY

Hope it helps

Try defining the differential width and spacing in the physical rules. The only thing I set in electrical rules is the static phase tolerance. If the gap is less than the default minimum, you will need to also define a constraint in the spacing rules.

So you use the physical constraints only when the gap is lower than default minimum or in general? and I'm curious as why you don't recommend using the electrical gap constraints 

I use physical constraints on all diff pairs, regardless of the gap.  I assign a spacing rule if gap is less than default. The electrical width / gap settings don't work for me. 

Interesting. Alright, thanks for sharing