[SI-LIST] Re: Routing of 12 GHz diff pairs
- From: Chris Cheng <chris.cheng@xxxxxxxxxxxx>
- To: "'buck@xxxxxxx'" <buck@xxxxxxx>, Si-List <si-list@xxxxxxxxxxxxx>
- Date: Wed, 2 Apr 2003 13:01:02 -0800
Buck,
No offense to your customer. But if they simply expect your team to go on
your own to route a 12GHz design without any rules and strategy, they are
smoking something really good. Designing GHz system requires not only
knowledge of the PCB but also each and every single components all the way
from the die, package, connector and termination schemes. Simply giving
instruction on "time of flight across the pair must be equal at all points"
is not good enough. Pad structures, pin escape strategies, serpentine
spacing, via and return structures (to name a few) is just as important. I
suggest you ask them to write down the design rule and sign their name on it
before you start. At least that what I did with some of your other teams
(they are great BTW).
Chris
-----Original Message-----
From: buck [mailto:buck@xxxxxxx]
Sent: Wednesday, April 02, 2003 5:35 AM
To: Si-List
Subject: [SI-LIST] Routing of 12 GHz diff pairs
Hello,
We are working with a customer that is using 12 GHz diff-pair signals.
The customer "requires" that the time of flight across the pair
"must" be equal at all points in time. Can any one shed any light
on how this can be done?
We are using Allegro tools any assistance is greatly appreciated.
Thanks,
Buck...
KAW/USA
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