Happy,
he is using flex...that is polyimide (known as kapton).  The k=3.0-3.6 if my
old memory is correct...did I miss something? pardon...
                             jk

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Happy Holden
Sent: Tuesday, February 14, 2006 4:24 PM
To: [log in to unmask]
Subject: Re: [TN] Impedance Spec +/-5% and Cpk of 1.33


Glenn,
If you look at the nominals of variables and their tolerances that make up
the industry std. +/- 10% on impedances, to get to +/- 5% of SE 50 ohms or
DIFF 100 ohms TAKES a lot of improvements on all fronts, as the other
emails detail.  Under special circumstances (like sorting materials) the
+/- 5% or 2.5 ohms for a SE 50 ohms can be reached (we did it for RamBuss
at 28 ohms) but is will NOT be robust or a volume production process-just
HAND CRAFTED !  Not to mention the difficulty in using a TDR to an
accuracy of +/- 5%

Note     Fabrication Factors    For +/- 5 ohms          For +/- 2.5 ohms
                                For normal Products     For MemBus
*1       Core thickness             +/- 0.5 mil             +/- 0.3 mil
*2       Resin Content              50 +/- 3 %              50 +/- 2.5 %
*3        Board thickness        +/- 3  mil                  +/- 2  mil
              after Lamination
*4       Di-electric constant    4.4 +/- 0.3                  4.4 +/- 0.2
*5       Trace width control     +/- 0.8 mil                  +/- 0.5 mil
*6       Cu thickness control    +/- 0.5 mil                   +/- 0.3 mil
*7       S/M thickness               +/- 0.3 mil                       +/-
0.3 mil

Happy Holden
Asian Pacific Materials



Glenn Pelkey <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
02/14/2006 02:05 PM
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Subject
[TN] Impedance Spec +/-5% and Cpk of 1.33






Hi folks,

Is the industry capable of this requirement?

Impedance +/-5% with a demonstrated Cpk of 1.33.

This could apply to Single Ended 50 ohms or 100 ohms Differential.
Also, this is on a Flex Circuit.

Thanks,

Glenn


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