RE: [SI-LIST] : LVDS

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From: Degerstrom, Michael J. (degerstrom.michael@mayo.edu)
Date: Thu May 10 2001 - 13:07:31 PDT


Suresh,

I'm not familiar with this differential probe. You can send
me the specs and I'll give you my opinion.

LVDS has only 4ma drive current and can easily be disturbed
with a "10X" probe. I still use 10X (~450 ohm series resistor)
but then use a DC block before sending the signal to a 50 ohm
scope. If the probe is a high impedance FET probe then
you would be limited by the bandwidth and possibly capacitive
reflections from the probe bouncing off the LVDS driver
and getting back into your probe and on toward your scope.

Mike

_______________________________________________________________
Mike Degerstrom Email: degerstrom.michael@mayo.edu
Mayo Clinic; 200 1st Street SW ; Rochester, MN 55905
Phone: (507) 538-5462 FAX: (507) 284-9171
WWW: http://www.mayo.edu/sppdg/sppdg_home_page.html
_______________________________________________________________

> -----Original Message-----
> From: Suresh Subramaniam [mailto:Suresh.Subramaniam@xilinx.com]
> Sent: Thursday, May 10, 2001 12:12 PM
> To: silist
> Subject: [SI-LIST] : LVDS
>
>
> Hello SI pundits,
>
> I have a couple of questions regarding probing of LVDS signals.
>
> Here is the scenario:
>
> I have several LVDS loops (840 MHz). I am interested in placing
> Agilent Differential Pair Probe connectors somewhere along
> each loop. My
> concern is that it will/may degrade or alter the signals? I was
> wondering if anybody out there has had any experience with
> this sort of
> arrangement. Also, I would welcome any suggestions/recommendations on
> probing LVDS loops.
>
> Thanks very much,
>
> Suresh Subramaniam
>
>
>
>
>
>
>
>
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