[SI-LIST] Re: How to properly simulate signal integrity across PCBs interconnected by Flex?
- From: Michael Brenneman <meb@xxxxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 04 Sep 2007 12:29:30 -0700
st1\:*{behavior:url(#default#ieooui) } Dear SI List,
If you have an interest in better understanding the question of designing
andsimulating polyimide for signal integrity across PCBs interconnected by
flex, I invite you to participate in Ansoft's fall applications symposium,
First Pass System Success.
A presentation co-presented by Panasonic Corporation regarding signal
integrity in Network cameras will show how to improve signal integrity and
reduce EMI using simulation together with good design strategies. The use
of polyimide materials will be highlighted as one vehicle to improve the
design.
Simply click on the link below and click on Panasonic for the full abstract.
http://www.ansoft.com/firstpass/[1]
If you are interested in other topics like multi-gigabit serial design,
powerintegrity, complex antenna design, WIMAX, RFID, etc, simply click on
ourpartner logos and/or view the abstracts by topic. This symposium is a
world-wide event and will begin next week in Bangalore, Singapore and then
onto China. There are dates and locations in many cities, so hopefully an
event will occur in your location that you can join.
Mike Brenneman
Technical Director, Packaging and PCB Design
Ansoft Corporation
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx[2]
[mailto:si-list-bounce@xxxxxxxxxxxxx[3]] On Behalf Of Kotson, Michael
Sent: Tuesday, September 04, 2007 11:29 AM
To: jeanpierrepoulin@xxxxxxxxx[4]; si-list@xxxxxxxxxxxxx[5]
Subject: [SI-LIST] Re: How to properly simulate signal integrity across PCBs
interconnected by Flex?
Hi Jean-Pierre,
We regularly use flex cables in our designs which must be qualified
for MIL-STD EMI levels (much tougher than FCC), so I really don't think
you will have much issue. Follow the same design guidelines that you
would for a rigid PCB (continuous return path, minimize reflections,
etc). Samtec does a great job of providing spice connector models for
flex-type connectors. Most any simulation package will handle this kind
of scenario, but I personally use Hyperlynx due to its simplicity. One
word of caution however, polyimide (the dielectric used to make flex
circuits) can be _VERY_ lossy at higher frequencies. Always check the
loss tangent of the polyimide manufacturer you plan to use, as I've seen
a wide range in this number from various manufacturers.
Best of luck to you,
-Mike
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx[6]
[mailto:si-list-bounce@xxxxxxxxxxxxx[7]]
On Behalf Of jeanpierrepoulin
Sent: Friday, August 31, 2007 2:04 PM
To: si-list@xxxxxxxxxxxxx[8]
Subject: [SI-LIST] How to properly simulate signal integrity across PCBs
interconnected by Flex?
Hello Gurus,
I am attempting to correctly design the first time a system=20
consisting of five small PCBs interconnected by short (1-5 inch) Flex=20
cable. While most signals are single ended and of moderate speed (20-
80 Mhz and with most edges controlled by the driving strength of FPGA=20
drivers), I am particularly concerned about some clock signals that I=20
need to spread to all these PCBs and wish to properly simulate...
1. Is there a flex connector vendor in particular that publishes=20
quality IBIS model the simulating software will need?
2. What simulating software do you recommend as easiest to use for=20
this type of need?
3. Do you think usage of Flex cabling in this fashion would cause =20
problems during FCC certification?
4. Any good web site / publication you've seen on the subject of=20
signal integrity across Flex cabling?
Any hint you could offer is greatly appreciated!!
Jean-Pierre Poulin
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