[SI-LIST] Re: De-embed fixture
- From: Long Yang <long.0.yang@xxxxxxxxx>
- To: J_Dong@xxxxxxxxxxxxxxxx
- Date: Sat, 6 Aug 2011 17:16:44 +0800
I remember that Matlab only supports 2-port S-parameter. Please refer
matlab help file
----------------------------------------------------------
S_PARAMS is a complex 2x2xM array, representing M two-port S-parameters.
Z0 is the reference impedance, the default is 50 ohms.
ABCD_PARAMS is a complex 2x2xM array, representing M two-port
ABCD-parameters.
----------------------------------------------------------
Several months ago, I used matlab for my de-embedding project using
my own Matlab codes.
Regards
Long
On Fri, Aug 5, 2011 at 00:26, <J_Dong@xxxxxxxxxxxxxxxx> wrote:
> 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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