FreeLists / si-list / [SI-LIST] Re: Differential S-parameters

["Chuck Hill" <chuckh@xxxxxxxxxxx>]

Pat, Mick,

I've not heard of any equipment to make direct differential S-parameter
measurements.  The problem when using a balun is getting the reference plane
at the DUT not at the balun, and getting calibration standards in the
environment of the device.  Another is getting the high mode isolation.

The current solutions don't really handle non-linear devices since they
assume a linear system.  Perhaps, the frequency offset mode (like 8720E
option 089) could be used to look for IM products generated by the
non-linearities. If you come up with something here, I'd like to hear about
it.

Chuck Hill, consultant



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Zhou, Xingling (Mick)
Sent: Thursday, January 10, 2002 8:45 AM
To: 'zabinski.patrick@xxxxxxxx'; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Differential S-parameters



Hi,

We have exactly the same concern.

I use the formulas published in MTT-Vol47,No.1,1999,pp.1071-1077. The
authors proposed PMVNA system. I do not know any commericial one.

Furthermore, how does the "Network Analyzer with Ungrounded Ports
(SP_Diff.)" in Agilent ADS
work in this case? I mean, are the definitions consistent?

Mick

-----Original Message-----
From: Zabinski, Patrick J. [mailto:zabinski.patrick@xxxxxxxx]
Sent: Thursday, January 10, 2002 9:23 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Differential S-parameters



In the past few years, we've seen a tremendous surge
in the application of differential signaling, and we
do not expect the trend to end anytime soon.

In our lab, we like to characterize our devices, both
active and passive, with S-parameters.  We feel S-parameters
give us MUCH useful information.

However, making differential S-parameter measurements
takes us a considerable amount of effort, requiring
a series of baluns, switches, etc., all manually
controlled/installed.

Is there a commercial piece of equipment on the market
(or being developed) that makes truly differential S-parameters.

I am aware of the ATN/Agilent system that takes single-ended
measurements and mathematically converts the results to
differential, but for active/non-linear devices, I believe
we really need a truly-differential capability.  Does such
a beast exist?

Thanks,
Pat

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