My first question would be how you measured Dk/Df on the board.
Scott McMorrow, CTO Signal Integrity Group
Samtec
Office 401-284-1827 | +1-800-726-8329
www.samtec.com
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Hung Dang
Sent: Wednesday, May 16, 2018 9:22 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Dk/Df value is increased very much after fabric progress firs
Dear Expert,
When I run SI simulation, I apply Dk/Df of PCB material from datasheet.
After fabric progress, I measured on the actual board, Dk is increased 28.7%
(3.65 --> 4.7) and 41.6%(0.012 --> 0.017) for Df when comparing with value in
datasheet.
So I have concerns below:
1/. What is the Dk/Df worst value which I should apply to simulation phase?
2/. Could you help to list some application note or paper which talk about this
issue?
Thank you so much.
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