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How to change trace width and gap for diff-pair
syhaunguyen , 02-17-2016, 10:55 AM
Hi all, I have pcb project.
All diff-pair is connected. but not match impedance (width and gap). I set design rule for diff-pair and run DRC for checking.
What is best way to clear diff-pair routing DRC as well.
Thanks.
All diff-pair is connected. but not match impedance (width and gap). I set design rule for diff-pair and run DRC for checking.
What is best way to clear diff-pair routing DRC as well.
Thanks.
mairomaster , 02-17-2016, 01:09 PM
You can easily change the width of single ended tracks after you have done the tracking by selecting them and using the PCB Inspector. However, I am not sure how would this work for differential pairs. With differential signals you would still be able to adjust the width (again with the inspector), but I don't know a way to adjust the gap. You might need to fix the gaps manually after you have the rule. Let see what the others will say.
robertferanec , 02-18-2016, 03:22 AM
@syhaunguyen, we usually re-route them.
It is possible to adjust differential pair impedance the way, that you make tracks thinner (as @mairomaster described). Usually PCB house do it. However, this is not always possible and you may not meet single ended impedance then.
It is possible to adjust differential pair impedance the way, that you make tracks thinner (as @mairomaster described). Usually PCB house do it. However, this is not always possible and you may not meet single ended impedance then.
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