[SI-LIST] Re: Are flex pcbs now competing with ribbon cables in terms of signal integrity?
- From: "Peterson, James F (EHCOE)" <james.f.peterson@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 9 Nov 2007 08:02:08 -0500
Bill,
I read the article. It had good fab info, but lean on the SI
perspective. I've been assuming that if I get good Er data, and control
the dimensions, that my approach to rigid flex SI analysis is similar to
a regular PCB. In fact, I've been just modeling these flex boards as
basic PCBs....
Anybody see a weakness in this approach?
Thanks,
Jim Peterson
Honeywell
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Hargin, Bill
Sent: Thursday, November 08, 2007 8:16 PM
To: tom_cip_11551@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Are flex pcbs now competing with ribbon calbes in
terms of signal integrity?
Hi Tom:
You may find this article on rigid-flex design fairly interesting:
http://pcdandf.com/cms/cms/content/view/2948/95/
Bill Hargin
High-Speed Marketing Manager
Mentor Graphics Corp.
Systems Design Division
425-301-4425 - Mobile=3D20
=3D20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=3D20
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of tom_cip_11551
> Sent: Thursday, November 08, 2007 10:16 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Are flex pcbs now competing with ribbon=3D20
> calbes in terms of signal integrity?
>=3D20
> Hi Si-List experts,
>=3D20
> I am working on an application that requres ribbon cable runs=3D20
> of about a meter, for differential pairs at 100 Ohms (50 Ohms=3D20
> odd mode) impedance. My data rate is about 1.5 Gb/s . I have=3D20
> had lots of experience specifying printed circuit boards over=3D20
> the years and I though that "flex" pcb circuits were limited=3D20
> to the panel sizes of a particular fab house. Recently, I=3D20
> have seen some data to the effect that "ribbons",=3D20
> manufactured like pcbs, are available now that can be run=3D20
> for many feet, because of "step and repeat" fabrication =
processes.=3D20
>=3D20
> Yes, I am aware of the limiting factors of long cable runs on=3D20
> high speed signals (dispersion, crosstalk, emi, etc) but I am=3D20
> wondering if FPC (flexible printed circuit) technology has=3D20
> advanced to the point where it can compete with ribbon cable=3D20
> technologies. I know that in terms of signal integrity, a pcb=3D20
> beats a cable.
>=3D20
> Thank You
> Tom
> tom_cip_11551@xxxxxxxxxxx
>=3D20
>=3D20
>=3D20
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