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Date: 10/26/03 at 5:23 PM
Posted by: Ray
E-mail: rrogers@plaidheron.com

In Reply to: about Smith Chart posted by frank on 10/26/03 at 8:36 AM:

This is a test right?
It's been some time, but I have been meaning to recall my RF knowledge for some time.
Trusting my memory to misserve me at some embarassing point.
The Inductive/Capcitative part is trivial.
Hook an inductor across the input port and a capacitor across the output port; with no connection and you should have the results. For power flow a gyrator would make either and inductive or capcitor appear that way.
Try
http://eesof.tm.agilent.com/docs/adsdoc15/pdf/ccsys.pdf
and HP has other RF design papers covering the smith chart.
The "Network Analyzer Basics" document would probably cover a lot it.
I don't have a 8753B to test it on; but I think the little circles would correspond to parasitic elements that are weakly coupled to the signal paths; parasitic capacitors coupled by traces and such. They should be outside of your freq range, or you should make sure the coupling is acceptable.
Sorry I couldn't be of more help; presuming that this wasn't just a "testing" question.

Ray

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