[SI-LIST] Re: De-embed fixture

Ming Li,

I worked with Agilent on this exact problem.  

Agilent developed a method within ADS to perform "S-parameter bi-section".  The 
method is pretty cool, you iterate in frequency to develop 2 mirror images 
which when combined yield the fixture response.  It worked perfectly on 
simulated data but had a lot of glitches when using real world data.  Small 
things like phase wrap and noise lead to problems with the data.   The big 
killer is that you assume the fixture response is symmetric, but in in all 
likelihood it's not perfectly symmetric.

To Agilent's credit, we did get there with this method but at the end of the 
day a TRL/M cal method was more robust and quicker for fixture removal.

Good luck - 
jn

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Ming Li
Sent: Thursday, August 04, 2011 12:02 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] De-embed fixture

Hi, experts,
I get two identical fixtures on both sides of my DUT. And I got the s4p data of 
the fixture itself and s4p data of the DUT cascading with the two fixtures. 
Could you please kindly let me know how I can de-embed the fixture and get the 
s4p data for the DUT? I know the math behind it but the data itself is too big 
to calculate.

Thanks in advance.

Regards,
Ming Li


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