[SI-LIST] Re: A question about how fast the step pulse we need in measuring impedence
- From: olaney@xxxxxxxx
- To: huang.jian2@xxxxxxxxxx
- Date: Fri, 1 Aug 2008 07:09:03 -0700
TDRs such as the Agilent 54754A let you mathematically change the
risetime. This lets you see fine detail using a fast risetime (~35 ps
for this instrument), and what your logic edges will look like using a
representative risetime. If your instrument has the math routine built
in, there is no need to use a physical filter to set risetime.
Alternatively, you could export a data file and run it through your
choice of algorithm independent of the instrument. However, when it is
done in the instrument, you can see the results in real time.
Orin
On Fri, 1 Aug 2008 18:50:03 +0800 huang.jian2@xxxxxxxxxx writes:
> 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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