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January 1999

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Subject:
From:
"<Andy Slade>" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 8 Jan 1999 14:22:44 -0500
Content-Type:
text/plain
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text/plain (74 lines)
     Frank,

     1) Your fab shop will need need to test the impedance of the sample
     traces - either on board or on a coupon added to the panel - using
     TDR.  Most fab shops these days have the equipment to perform this
     test.  A printed report, listing serial number and test measurements
     should be requested.

     2) Unless your incoming inspection is also equipped with TDR, there's
     not much they can do.

     3) If coupons are used for impedance testing, these can certainly be
     supplied to an independent lab for verification.

     Hope this helps...Andy Slade




______________________________ Reply Separator _________________________________
Subject: [TN] Micro-strip and Controlled Impedance
Author:  "Kimmey; Frank" <[log in to unmask]> at SMTPLink-Hadco
Date:    01/08/99 10:25 AM


Hi all,
I need a little help here.
After doing RF microstrip designs for the past 5 years I need now to
control impedance. We have in the past been able to tweek the design to
accommodate for fab tolerances, this luxury is now gone. I am working on
a critical circuit that will use 0603 components and 11 printed
inductors.
What I need to know is:
1.) What tests should I have performed by the vendor?
2.) What tests can my in-coming QA guys do?
3.) What differences should there be in my Fab notes?
4.) If I call out 50ohm impedance should I accept a cert. of conformity
or have additional tests run (outside lab)?
5.) Anything else I need to worry about?
Thanks for your time and answers
FNK

Frank N Kimmey C.I.D.
EM Designer
C & K Systems, Inc.
916-353-5366
[log in to unmask]

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