Using a single port network anaylser to measure a differential system
Using a single port network anaylser to measure a differential system
(OP)
I have a single port network analyser (HP 8714B), but I need to perform a measurement on a differential system.
We had planned on taking each core of the differential system, and testing it relative to the shield using a single-ended measurement. However, our system has evolved to include a resistive network between the two cores of the differential pair in order to achive some impedance matching.
I think I am after some kind of Balun, but we need to test from around 300Mhz to 3Ghz.
Is there some standard way of using a single port network anaylser to measure a differential system?
Thank you for your help.
Best regards,
BPELEC.
We had planned on taking each core of the differential system, and testing it relative to the shield using a single-ended measurement. However, our system has evolved to include a resistive network between the two cores of the differential pair in order to achive some impedance matching.
I think I am after some kind of Balun, but we need to test from around 300Mhz to 3Ghz.
Is there some standard way of using a single port network anaylser to measure a differential system?
Thank you for your help.
Best regards,
BPELEC.





RE: Using a single port network anaylser to measure a differential system
Gunnar Englund
www.gke.org
RE: Using a single port network anaylser to measure a differential system
Thank you for your reply skogsgurra, and I think your suggestion may well be the way to go.
I have found an application note from a company that makes transformers:
http://www.picosecond.com/objects/AN-8.pdf
The same company seems to make baluns that work over a very wide bandwith (about 200 kHz to 15 Ghz). This may well be a solution for me, and I am talking to the company.
However, if there are any other solutions out there, I would be very interested to hear them.
Thanks,
BPELEC.
RE: Using a single port network anaylser to measure a differential system
[SE] analyzer input.
Then take the transfer function [TF] of the baluns only:
[SE] input -- balun -- balun -- [SE] An. input
Then subtract the TF-s.
You may have to devide the frequency range into subranges
if the baluns can't cover it with acceptable loss.
Plesae read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: Using a single port network anaylser to measure a differential system
Best regards,
BPELEC.
RE: Using a single port network anaylser to measure a differential system
Plesae read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>