[SI-LIST] Re: S parameter translation to different characteristics impedance
- From: steve weir <weirsi@xxxxxxxxxx>
- To: piyush.bhatt@xxxxxxxxx
- Date: Sun, 11 Apr 2010 21:27:39 -0700
If you question the conversion method you now have a great opportunity
to compare results each way. Retake the data and compare what you
measure to what the conversion method shows you.
Steve.
piyush.bhatt@xxxxxxxxx wrote:
> For getting S parameter from VNA we should set impedance of VNA to nearly
> equal to transmission line. But I already have data with wrong input
> impedance. I want to change that to a different impedance value. "High-speed
> Digital system Design, Hand book of interconnects theory and design practice
> by Stephen hall, Garrett hall and James McCall" gives a method in appendix
> D.2. To convert S parameter to a impedance matrix and then subtract this
> value from each number. We should also verify that S11,S22 should nearly
> equal to zero.
> But how accurate will be this method when done in practice as actual
> impedance of trace will change with freq and S parameter file will have value
> for different freq but which impedance to subtract from that. Is there any
> tool with can help me with this?
>
> regards
> Piyush Bhatt
>
>
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Steve Weir
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