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
an 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?
regards,
Tim Hutcheson
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