[SI-LIST] Interpreting s-params to physical voltage levels.
- From: "Lakshmi N. Sundararajan - PTU" <lakshmi.s@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 5 Mar 2010 18:11:17 -0800
Hi Gurus,
Let us suppose I have s-param for a channel.
I wanted to figure out from those s-param numbers, assuming I have a 1V
input signal, how much would my receive signal magnitude be?
Assuming, s-params are in decibels, then I figure the following
definitions for each of them..
Sxx_db = 20 Log (Sxx)
Sxy_db = - 10 Log ((Sxy ^ 2)/(1 - Syy^2)) /* negative sign is normally
ignored since it is defined as loss */
From the above two equations, I can figure out Sxx and Sxy.
And if I assume Vincident,x = 1V
Then are the following equations correct?
Vreflected,x = Sxx * Vincident,x
Vinsertion,y = Sxy * Vincident,x
If the above equations are correct, then I can translate manually from a
given set of s-params to a typical voltage levels to see the amount of
attenutation,
Magnitude wise on the channel, which is what I am looking for.
Please correct me here in case my thinking is way off.
Thanks,
-LN
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