[SI-LIST] Extract an accurate model from TDR IConnect

I have a question about extracting an accurate model from TDR IConnect.
The question is that when I want to extract a DUT which the Impedance is
not 50 ohm, 

(for example, an USB connector which the differential impedance is 90
ohm). 

Should I need to make a fixture to transfer impedance from single end 50
ohm to differential 90 ohm,

And then connect between TDR and DUT. 

The purpose is to eliminate the discontinuity that maybe affect the
model accuracy we extract.

Or can I directly use the 50 ohm SMA cable connect the DUT to extract
the model?

The accuracy will be the same or not?

I am worried because the USB connector is very short.

If I directly use 50 ohm SMA cable, I am afraid that the discontinuity
will cover all the model effect.

Please give me some suggestions.

Thanks for help,

I am truly appreciated.

 

David


------------------------------------------------------------------
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:
http://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:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: