Converting S-parameters to Impedance

[Jonesje]

Hello,

I've created an Inductor in a simulation software and need the inductance. I can run a simulation to obtain graphs of S(1,1) , S(1,2) , S(2,1) , S(2,2), Z0, and some other values.

How can I determine the impedance of the inductor at a certain frequency in order to find inductance?

Thanks.

 

[pancho_hideboo]

See https://www.designers-guide.org/Forum/YaBB.pl?num=1205240723/9#9

 

[Jonesje]

See https://www.designers-guide.org/Forum/YaBB.pl?num=1205240723/9#9

Thanks alot!

It's actually a differential inductor I've created as well.

I have a few questions about the equations.

Where does R0 = 50 come from? Is that a preset value?
You have freq = xval(s11). What is this function? Is this just the frequency that these values are taken at?
Lastly, are the S values complex numbers with the magnitude and phase? Or just the magnitude? I assume Sdiff and Zdiff are complex as well.

Thanks.

 

[biff44]

gee, Norton blocked a couple malicious file actions from that website! do not click

 

[pancho_hideboo]

Where does R0 = 50 come from?
Is that a preset value?

It is a characteristic impedance for S-parameter, that is, port impedance.

What value did you specify as port impedance for evaluation S-parameters ?

You have freq = xval(s11).
What is this function?

See the followings.
https://www.designers-guide.org/Forum/YaBB.pl?num=1196459940/1#1
https://www.edaboard.com/threads/235470/

Lastly, are the S values complex numbers with the magnitude and phase?

Of course, complex numbers.

I assume Sdiff and Zdiff are complex as well.

They are, of course, complex numbers.