[SI-LIST] Re: Diff line
- From: pikeda@xxxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 14 Feb 2002 18:08:12 -0800
Pravin,
This is just one more argument to loosely couple your differential lines. If
they have around 20 mils seperation, you can treat them as single ended and
serpentining has no effect on impedance. Here is an article by Dr. Howard
Johnson on why you don't need to tightly couple your diff pairs which I agree
with wholeheartedly. By the way I commonly do 3.125GHz loosely coupled and they
work very well.
http://www.sigcon.com/news/2_30.htm
Paul
" pravin patel" <fairfax100@xxxxxxxxxxxxx> on 02/14/2002 06:25:04 AM
Please respond to fairfax100@xxxxxxxxxxxxx
To: si-list@xxxxxxxxxxxxx
cc: (bcc: Paul Ikeda/Marvell)
Subject: [SI-LIST] Diff line
I am doing layout of 2.5Ghz diff. line and having hard time to match length of a
pair by 300 mil. I was going to make one line serpentine to make both line
matched. By doing serpentine, I am creating impedance discontinuty or I will
create skew.
Any Ideas. Thanks
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