[SI-LIST] Are flex pcbs now competing with ribbon calbes in terms of signal integrity?
- From: "tom_cip_11551" <tom_cip_11551@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 08 Nov 2007 18:16:26 -0000
Hi Si-List experts,
I am working on an application that requres ribbon cable runs of
about a meter, for differential pairs at 100 Ohms (50 Ohms odd mode)
impedance. My data rate is about 1.5 Gb/s . I have had lots of
experience specifying printed circuit boards over the years and I
though that "flex" pcb circuits were limited to the panel sizes of a
particular fab house. Recently, I have seen some data to the effect
that "ribbons", manufactured like pcbs, are available now that can
be run for many feet, because of "step and repeat" fabrication
processes.
Yes, I am aware of the limiting factors of long cable runs on high
speed signals (dispersion, crosstalk, emi, etc) but I am wondering if
FPC (flexible printed circuit) technology has advanced to the point
where it can compete with ribbon cable technologies. I know that in
terms of signal integrity, a pcb beats a cable.
Thank You
Tom
tom_cip_11551@xxxxxxxxxxx
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