[PCB_FORUM] Hi-speed routing

It depends is the correct answer.  160ps / in is completely wrong for some
PCBs.  In stripline, the velocity is C/sqrt(Er).  Whenever the Er ~= 4.0
then the velocity is in the neighborhood of 160ps/in.  For teflon in the
Er=2.2 region, the velocity is not 160 ps/in.


Cheers.

 

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of weiheng li
Sent: Monday, October 20, 2008 2:57 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Hi-speed routing

 


Hi,
 
I have a simple quesion.  Usually, how many nano-seconds does 1-inch-trace's
propagated delay equal to?  Thank you. 
 
Regards,
 
Weiheng
 
 

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