check http://www.pcbquality.com/ Q/A have some input and test structures...
IPC 04-05 roadmap may also provide some input...
                 jk

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Jeffrey Bush
Sent: Tuesday, February 14, 2006 2:28 PM
To: [log in to unmask]
Subject: Re: [TN] Impedance Spec +/-5% and Cpk of 1.33


This depends on the materials, dielectric and line dimensions which
contribute the standard deviation.  Generally +/-5% is difficult to
achieve, although we have a few designs that are capable @ a 5%
tolerance.

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED
           76 Technology Drive - POB 1890
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 37
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/>

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glenn Pelkey
Sent: Tuesday, February 14, 2006 2:06 PM
To: [log in to unmask]
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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