[SI-LIST] Re: De-embed fixture
- From: Long Yang <long.0.yang@xxxxxxxxx>
- To: Jim Nadolny <jim.nadolny@xxxxxxxxxx>
- Date: Sat, 6 Aug 2011 17:26:04 +0800
When I worked on my de-embedding project several months ago, I was
trying to use ADS because ADS said it can do it.
When port number is below 4, such as s4p, s2p, ADS works fine.
But when the port number is 6, or 8 or greater, ADS may not work well.
I am not sure if ADS is wrong or I am wrong because I am new to ADS,
but I am so sure the same method was applied to use ADS for either 4
port S-parameter or 6 or 8 or even 12 port S-parameter.
I worked with local ADS application engineer, and they can re-produce
the "questionable" results.
So I had to write Matlab codes to run de-embedding.
Just for reference.
Best Regards
Long
On Fri, Aug 5, 2011 at 00:39, Jim Nadolny <jim.nadolny@xxxxxxxxxx> wrote:
> 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
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
