[SI-LIST] Re: Interpreting s-params to physical voltage levels.
- From: Istvan Novak <istvan.novak@xxxxxxx>
- To: "Lakshmi N. Sundararajan - PTU" <lakshmi.s@xxxxxxxxxxx>
- Date: Sat, 06 Mar 2010 00:16:23 -0500
Hi Lakshmi,
This way of calculation would be limited to frequency-independent S
parameters, which they are definitely not. Keep in mind that in your
equations the S parameters are in the frequency domain, your voltages
are in the time domain.
Regards,
Istvan Novak
Oracle
Lakshmi N. Sundararajan - PTU wrote:
> 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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