[SI-LIST] Re: Port extension with VNA

Hi Jun,
 

You can verify it by translating your data into time domain and you may
find something.

 

Thanks and Regards,

Leon

 

From: jun li [mailto:lijun_hit@xxxxxxxxx] 
Sent: Thursday, June 24, 2010 11:31 PM
To: si-list@xxxxxxxxxxxxx; Leon Wu
Subject: Re: [SI-LIST] Re: Port extension with VNA

 

Leon,

Thanks for patient clarification. My question is to port extension which
calibration is a better way. TRL calibration is more accurate for
removing fixture from measurement, but I can't verify this from our skew
measurement. Because the skew value got from TRL calibration is too big
to be true.

 

Thanks

Jun

 

 


--- On Wed, 6/23/10, Leon Wu <Leon.Wu@xxxxxxxxxx> wrote:


From: Leon Wu <Leon.Wu@xxxxxxxxxx>
Subject: [SI-LIST] Re: Port extension with VNA
To: "jun li" <lijun_hit@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
Date: Wednesday, June 23, 2010, 11:52 PM

Hi Jun,


Some papers demonstrate the TRL cal is more accurate than SOLT cal in
IEEE but it still depends on how the fixture was designed. 

Maybe you can search the IEEE web site to get the papers.

You can search the application notes in Agilent web site as well. They
have some paper available in the web site.

I ever seen a comparison table which Agilent released before.



Thanks and Regards,

Leon

From: jun li [mailto:lijun_hit@xxxxxxxxx] 
Sent: Thursday, June 24, 2010 12:28 PM
To: si-list@xxxxxxxxxxxxx; Leon Wu
Subject: RE: [SI-LIST] Port extension with VNA



Leon,
Many thanks for your reply. Since you mentioned there is much difference
for long fixture with these two calibration methods, which one is more
accurate? Is there any paper talking about this?

Thanks
Jun



--- On Wed, 6/23/10, Leon Wu <Leon.Wu@xxxxxxxxxx> wrote:


From: Leon Wu <Leon.Wu@xxxxxxxxxx>
Subject: RE: [SI-LIST] Port extension with VNA
To: "jun li" <lijun_hit@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
Date: Wednesday, June 23, 2010, 7:02 PM

Hi Jun,

Based on my experience, 'port extension' function is just for the phase
but not for the magnitude.
And if your fixture is long enough or have large discontinuities, the
difference becomes large.

Thanks and Regards,
Leon
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of jun li
Sent: Thursday, June 24, 2010 9:34 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Port extension with VNA

Hi, allIs it necessary to use SOLT calibration for port extension? In
theory, TRL calibration should work, too. But we got far different value
with these two different calibration method.
ThanksJun

      

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