[SI-LIST] Re: Group Delay of FR4 Trace

  • From: "qazi" <qazi@xxxxxxxxxx>
  • To: "'Neo'" <neoflash2008@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 2 Jun 2009 14:42:38 -0700

I am not sure why skin effect will play a role in group delay. Rather
variation of dielectric of Fr-4 over this wide range should play a role. 
What is the definition of almost flat? :)

-Qazi

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Neo
Sent: Tuesday, June 02, 2009 2:29 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Group Delay of FR4 Trace

Hi,
I recently did a simulation on a 40inch FR4 channel. The group delay is
calculated with the derivative of sdd21(phase). 

I'm surprised to find that the group delay is almost flat from 1-10GHz.
Shouldn't it have some slope due to skin effect?

Regards,
Neo   



      
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