[SI-LIST] Re: Propagation speed of a stripline trace in PCB
- From: "CHEN, QI" <chenq@xxxxxxxxxxxx>
- To: Mani Ganesan <signal.integrity2@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 3 Sep 2010 18:37:01 +0000
The TDR measurement data you got is for the "round trip". The signal actually
travels twice the trace length.
________________________________________
From: si-list-bounce@xxxxxxxxxxxxx [si-list-bounce@xxxxxxxxxxxxx] on behalf of
Mani Ganesan [signal.integrity2@xxxxxxxxx]
Sent: Friday, September 03, 2010 2:27 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Propagation speed of a stripline trace in PCB
Hi All
can you anyone confirm me whether the propagation speed of a stripline trace
in PCB is correct?
propagation speed (stripline) = 11.8/sqrt(epslon_r) inches/ns
epslon_r = relative dielectric permittivity.
So for my rogers 4350 material i am having DK = 3.66
speed = 6.16 in/ns
my trace length os 2.47 inches. so the signla propogation time = 400 ps.
But my TDR measurement data both simulated and measured is showing around
800 pico seconds. Please see the attached plot.
Can anyone let me know what is the reason on that.
Thank You
SI
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