[SI-LIST] Re: A question about how fast the step pulse we need in measuring impedance
- From: "Tom Dagostino" <tom@xxxxxxxxxxxxx>
- To: "'steve weir'" <weirsi@xxxxxxxxxx>, <huang.jian2@xxxxxxxxxx>
- Date: Fri, 01 Aug 2008 11:05:20 -0700
I tend to make several different measurements of the channel at different
risetimes. I'll use the raw output to see what is going on in the channel.
This lets me see if there are any severe bandwidth limiting structures
(large discontinuities). I will then slow the risetime down to one half the
system risetime and use that to determine if there is anything that needs to
be cleaned up. Finally I'll use the system risetime.
Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
503-430-1285 FAX
tom@xxxxxxxxxxxxx
www.teraspeed.com
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of steve weir
Sent: Friday, August 01, 2008 4:07 AM
To: huang.jian2@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: A question about how fast the step pulse we need in
measuring impedence
The point of the instrument is to characterize the channel. Extra
bandwidth is usually a plus.
What you should be more concerned with is how to accurately deembed the
instrumentation from the DUT. If your launches obscure your
measurements your test data won't be worth very much.
Steve.
huang.jian2@xxxxxxxxxx wrote:
> Must we need to filtering the default step pulse that the impedence
> analyer generates so that the rise time of the filtered step pulse
> is matching the real condition in the transmission line? For example, the
> default rise time of step pulse that that the impedence
>
> analyer generates is 70ps, and the real rise time of applicable high speed
> signal in the tranamission line is 200ps.
>
> What if the default step pulse with rise time of 70ps used in measuring
> iimpedence?
>
> Thanks in advance
>
>
>
>
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--
Steve Weir
Teraspeed Consulting Group LLC
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