[SI-LIST] Re: Are flex pcbs now competing with ribbon calbes in terms of signal integrity?
- From: "Hargin, Bill" <bill_hargin@xxxxxxxxxx>
- To: <tom_cip_11551@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 8 Nov 2007 17:15:34 -0800
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=20
=20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=20
> [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=20
> calbes in terms of signal integrity?
>=20
> Hi Si-List experts,
>=20
> I am working on an application that requres ribbon cable runs=20
> of about a meter, for differential pairs at 100 Ohms (50 Ohms=20
> odd mode) impedance. My data rate is about 1.5 Gb/s . I have=20
> had lots of experience specifying printed circuit boards over=20
> the years and I though that "flex" pcb circuits were limited=20
> to the panel sizes of a particular fab house. Recently, I=20
> have seen some data to the effect that "ribbons",=20
> manufactured like pcbs, are available now that can be run=20
> for many feet, because of "step and repeat" fabrication processes.=20
>=20
> Yes, I am aware of the limiting factors of long cable runs on=20
> high speed signals (dispersion, crosstalk, emi, etc) but I am=20
> wondering if FPC (flexible printed circuit) technology has=20
> advanced to the point where it can compete with ribbon cable=20
> technologies. I know that in terms of signal integrity, a pcb=20
> beats a cable.
>=20
> Thank You
> Tom
> tom_cip_11551@xxxxxxxxxxx
>=20
>=20
>=20
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