TECHNET Archives

March 1999

TechNet@IPC.ORG
Options: Use Monospaced Font
Show Text Part by Default
Condense Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Content-Type:
text/plain
Sender:
TechNet <[log in to unmask]>
Subject:
Specifying Differential Impedance
From:
"Hurst, Joe" <[log in to unmask]>
Date:
Thu, 18 Mar 1999 08:20:45 -0500
MIME-Version:
1.0
X-To:
IPC - Designer Council <[log in to unmask]>
Reply-To:
"TechNet E-Mail Forum." <[log in to unmask]>, "Hurst, Joe" <[log in to unmask]>
Parts/Attachments:
text/plain (35 lines) 
Hi

        I have some very important differential pairs on a PWB that must
have a particular differential impedance.

        The problem is:  how can I specify this on the drawing sent to the
fab shop?

        Our usual method would be to call for a particular single-ended
impedance, which seems to be beating around the bush.     It work to a
point; but I think it leaves too many variables that could change the
differential impedance.

        Any thoughts on this?


Joe Hurst
PWB Designer
Computing Devices Canada
A General Dynamics Company
[log in to unmask]
613-596-7816

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################

ATOM RSS1 RSS2