RE: [SI-LIST] : revised 1GHz probe plans

Mellitz, Richard (richard.mellitz@intel.com)
Fri, 20 Aug 1999 05:53:45 -0700

Doug,
I've used methods similar to your probe before. It works well for a lot of
applications. BTW, great instructions! The only real problem I found with it
is that you get a 40 to 1 signal reduction. This sometimes gets in to signal
to noise spec of scopes for small signals. For example a 100 mv signal would
be 2.5 mv full swing.

.. Richard Mellitz,
Intel

-----Original Message-----
From: Douglas C. Smith [mailto:doug@dsmith.org]
Sent: Thursday, August 19, 1999 10:36 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : revised 1GHz probe plans

Hi All,

First, I have to apologize for a couple of replies that
accidently
went to the whole group instead of the intended person. I
was very
careful, but it happened anyway. It's cut and paste from now
on!

I have added a theory of operation section to the 1 GHz
probe plans on
my site at:

http://emcesd.com

The section discusses why the foil is needed and the
underlying
limitation on the useful frequency range of the probe. Also
added is
the ability to click on the probe pictures to blow them up
to full
screen size, instantly. You can even clearly read the values
on the
surface mount resistors!

I am interested in any comments on the theory addition
(correctness,
readability, etc.)

Also posted is the discussion on this month's problem of how
to
measure circuit voltages with a paper clip.

Thanks in advance,

Doug

--
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========= Los Gatos, CA 95031-1457
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