[SI-LIST] Re: Differential vs. SE for PCB Dk/Df extraction

  • From: "Moreira, Jose" <jose.moreira@xxxxxxxxxxxxx>
  • To: "johnlinc@xxxxxxxxx" <johnlinc@xxxxxxxxx>, si-list <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 23 May 2017 08:36:23 +0000


In my opinion differential or single-ended makes no difference for Dk/Df 
extraction. Important is the kind of structure you use. A simple trace is not a 
good structure. I suggest a resonant standard like a Beatty Standard.

Check the Designcon 2018 paper "Non-Destructive Analysis and EM Model Tuning of 
PCB Signal Traces using the Beatty Standard"

Jose

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of John Lin
Sent: Dienstag, 23. Mai 2017 05:53
To: si-list <si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] Differential vs. SE for PCB Dk/Df extraction

Hi SI gurus,

While using VNA to measurement traces on PCB  for loss and Dk/Df extraction,  
my colleagues say the differential handhold probe head can have wider bandwidth 
than single ended handhold probe head.  Is it true?
Can someone help to explain the reasons?

 Also, for Dk/Df extraction, which is better structure, using single ended or  
differential traces? Why?

Thank you for helps in advance.

Thanks,
John Lin


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