Tim,

Take a look at http://www.merix.com/resourcecntr/apps/balanced_pcbs.html it is an article on
Balanced board stackup... it will explain it best...


Sam Cox...



>
>> -----Original Message-----
>> From: Tim Hutcheson [mailto:[EMAIL PROTECTED]]
>> Sent: Wednesday, August 22, 2001 10:53 AM
>> To: Protel EDA Forum
>> Subject: [PEDA] Warping on small odd layer boards.
>>
>>
>>
>> Has anyone any experience building small (4x7 inch) 7-layer
>> .063" boards? I would like to have a certain stack up impedance that is best met with
>> 4,9,9,9,9,4 for the 5-mil trace widths I am using but I know
>> from what I have read that warping can be a problem. On the other hand,
>> a conventional 8-layer board would thin the layers and upset the
>> impedance and a 6-layer board adds impedance calculation problems and more layout issues.
>>
>> Do vendors even build odd layer boards?

ANSWER: YES, not suggested however...see article...

>>
>> regards,
>>
>> Tim Hutcheson
>
>
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