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October 1999

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Subject:
From:
"Keel, Mike" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 26 Oct 1999 11:30:17 -0700
Content-Type:
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text/plain (70 lines)
Jim

If you put power and ground on the outside of the board;

What happens when you have to re-work the signal layers ?

(Not that signal layers always require re-work)

Good Luck

M Keel
San Diego


                -----Original Message-----
                From:   Jim Mathis [mailto:[log in to unmask]]
                Sent:   Tuesday, October 26, 1999 7:32 PM
                To:     [log in to unmask]
                Subject:        [TN] 4-layer vs 2-layer costing

                Assuming all other considerations being equal (size, # of
holes, hole sizes,
                etc.), what is the typical cost adder for going 4-layer from
2-layer?  1.5X,
                2X. etc?

                Also, in an EMI-sensitive environment, how would you
recommend the layer
                stack-up?  Signal 1, Ground, Supply, Signal 2  OR Ground,
S1, S2, Supply?  OR
                something else?

                Thanks.


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