1. Have the vendor test the printed inductors during bed-of-nails testing of the entire bare PCB. You must
allow for testing of the inductors with TP's etc.
2. Your incoming QC can test sample lots. This is for qualification since the PCB vendor is testing the
boards %100 anyway.
3. Add the inductor values and tolerances to your fab notes. You must also add a note stating where the
measurements must be taken (between what 2 points). You will also need to talk over the PCB stack-up with
your vendor before you can design the inductors.
4. It depends on how confident you are in your PCB vendor.
5. Murphy.

Scott Buscomb
Techsonic Industries


Kimmey, Frank wrote:

> 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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