[PCB_FORUM] Re: 15.2 differential pairs and spacing setup

Make sure you put in a min line spacing in CM. Just make min line spacing
the same value as your primary gap. I just went thru the same thing. The way
I understand it is if you don't have a min line spac in CM the tool looks at
your net spacing type for line spacing even within the pair.
 
 

Mike Golding                   \  mike.golding@xxxxxxxxxx 
PCB Designer                  \  +1-920-969-6114 Phone 
Plexus Technology Group  \ +1-920-428-3280 Cell 
55 Jewelers Park Drive       \  +1-920-751-5366 Fax 
Neenah, WI  54957             \  www.plexus.com 

-----Original Message-----
From: Dickoff, Diane J [mailto:diane.j.dickoff@xxxxxxxxx] 
Sent: Tuesday, January 25, 2005 6:24 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: 15.2 differential pairs and spacing setup



Paul---thanks for getting back to me. But I am getting DRC's when I tried to
use the net spacing type with my diff pairs.

I have 7mil gap and 5 mil width in my diff pair (from CM). I have several of
these that need 20 mil spacing between these diff pairs. 

The DRC on the diff pair says I have 7 mil spacing and the net_spacing
requires 20.

 

Thanks, Diane.

 


  _____  


From: Paul_Keefe@xxxxxxx [mailto:Paul_Keefe@xxxxxxx] 
Sent: Tuesday, January 25, 2005 7:49 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: 15.2 differential pairs and spacing setup

 


Yes Diane that will do it, we have these constraints all of the time and it
works very well.  The Router 
will also do a very good job on them. 

  Good luck 

Paul Keefe






Dickoff, Diane J 
Sent by: 

01/24/2005 05:55 PM 


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[PCB_FORUM] 15.2 differential pairs and spacing setup

 


 

 




I know this has been discussed before but I want to make sure I am doing
this correctly. 
  
I have a large number of differential pairs with different spacing within
the diff pairs. But I also need different spacing between the sets of diff
pairs. 
  
For example 
  
Diffa+ and Diffa- has 7 mil spacing 
Diffb+ and Diffb- has 6 mil spacing 
Diffc+ and Diffc- has 8 mil spacing 
  
Diffa(+/-) must have 20 mil spacing to Diffb(+/-) and 
It must have 26 mil spacing to Diffc(+/-) (for example) 
  
So in the CM, I can put the 7,6,8 mil spacing for the diff pairs. 
But do I still use the net_spacing_type for the 20 and 26 mil spacing? 
  
Thanks, Diane

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