[SI-LIST] Re: Testing chips with system level specs
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: <doug@xxxxxxxxxx>, <davidjp@xxxxxxx>
- Date: Thu, 7 Sep 2006 17:18:30 -0600
That's my experience as well Doug.
Thanks for taking the time to run the test.
Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx
-----Original Message-----
From: Doug Smith [mailto:doug@xxxxxxxxxx]=20
Sent: Thursday, September 07, 2006 3:29 PM
To: davidjp@xxxxxxx
Cc: Grasso, Charles; dcuthbert@xxxxxxxxxx; SI-List; emc-pstc
Subject: Re: [SI-LIST] Re: Testing chips with system level specs
Hi David and the group,
I thought I would make some measurements. Humidity was not controlled=20
but constant and likely about 40% and room temperature.
I did many discharges into a ground plane through an Fischer F-65 (my=20
favorite ESD current probe) over a period of a several minutes around=20
8 kV. Most all of the discharges were relatively slow but once in a=20
while a fast event occurred. The occasional fast discharge happened=20
whether the approach was fast or slow.
Not sure if doing discharges in succession (5 seconds in between)=20
affects later discharges. If so that might explain some of the=20
results. It seems that there may be some remnants left over from the=20
previous spark.
Doug
Pommerenke, David wrote:
> Charles,
>=20
> On the "really fast discharges" using the Andy Hish simulatior I do
not =3D
> have the data here, as I am in Germany right now.=3D20
>=20
> But if you look at
>=20
> http://web.umr.edu/%7Etiumr/davidjp/Jour_Estat__high_qual_1995.pdf
>=20
> (the link has %7 in it, that is OK)
>=20
> at figure 10 and figure 11. You see measurements of discharges at 10kV
=3D
> having risetimes of about 100ps or so. That is very close to the limit
=3D
> of the measuremetn system (SCD5000).
>=20
> The physics of the very fast discharges in air discharge is explained
in
>=20
>=20
> http://web.umr.edu/%7Etiumr/davidjp/ESDForum_1993.pdf
>=20
> (kind of old paper, but the physics have not changed).
>=20
> Regards,
>=20
> David Pommerenke
>=20
>=20
--=20
-------------------------------------------------------
___ _ Doug Smith
\ / ) P.O. Box 1457
=3D=3D=3D=3D=3D=3D=3D=3D=3D Los Gatos, CA 95031-1457
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