[SI-LIST] Re: De-embed fixture
- From: "Qin, Zhenshui (NSN - CN/Shanghai)" <zhenshui.qin@xxxxxxx>
- To: <J_Dong@xxxxxxxxxxxxxxxx>, "Ming Li" <swagguy09@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 12 Aug 2011 17:35:33 +0800
Hi Junwei,
If what I can get is an S parameter file of 2 cascaded fixtures, let's
call it Sf2, rather than Sf (the S parameter file of only one fixture),
what can I do to de-embed it from my test results?
Thanks.
Bruce
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of ext J_Dong@xxxxxxxxxxxxxxxx
Sent: Friday, August 05, 2011 00:26
To: 'Ming Li'; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: De-embed fixture
Ming,
Assume your measured S parameters are Sa (for all) and Sf (fixture
itself),
you can convert them to their individual ABCD matrices, say, Aa and Af.
If
your DUT has abcd of Ax, then from: Aa = A1*Ax*A1 you can solve
Ax = A1^-1*Aa*A1^-1. After that, you can do an ABCD-to-S parameter
convert.
If I remember correctly, I think those functions are called s2abcd.m and
abcd2s.m in matlab. You might need a little bit programming because the
Snp
file has frequencies in it, and I am not sure if matlab will take care
of it
automatically.
Good luck.
Junwei Dong
-----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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