[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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