[SI-LIST] Re: PCB Impedance Failure
- From: "Mikhail Matusov" <matusov@xxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 11 Jan 2006 10:55:39 -0500
Clayton,
Can you describe what the board is supposed to do? What sort of technology
is used, what frequencies? Is it analog or digital, etc...
=======================
Mikhail Matusov
Hardware Design Engineer
Square Peg Communications
Tel.: +1 (613) 271-0044 ext.231
Fax: +1 (613) 271-3007
http://www.squarepeg.ca
----- Original Message -----
From: "Clayton Wrobel" <claywrobel@xxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Wednesday, January 11, 2006 8:31 AM
Subject: [SI-LIST] PCB Impedance Failure
> Hello all,
>
> I a have been watching this list for some time. I am not a SI
> engineer, but I am the divisions PCB expert.
>
> A board we just had fabricated failed the impedance test coupon. 59
> ohm vs 50+/- 10%. They could not measure the diffferential pairs
> because of an error on the coupon, but calculated 86 ohm impedance vs
> 100 +/- 10%
>
> We have no SI simulation tools in house, something I am working to fix,
> but I have been asked to characterize the risk in using these boards.
>
> My answer: I don't know... I have no idea what our noise margins are.
> I sound like an idiot, but at least an honest one.
>
> Any ideas, comments, etc?
>
> Clayton Wrobel
> Electrical Engineer, IPC CID
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
