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Date: | Wed, 09 Apr 97 13:25:50 PST |
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1. Do the design for manufacturing rules embedded in the common layout
packages support the use of microvias or is there a lot of fine tuning?
Some software do have blind microvia function built-in, but the layout
person may or may not know how to use it. I've also heard that the
built-in function is somewhat primitive, some manual routing may be
necessary. Check with the EDA vendors will be the quickest way to find
out.
2. Are there some standard cost drivers used by board manufacturers when
microvias are part of the design and if so what are the primary cost
drivers?
Cost drivers depend on the process you choose: control depth drilling,
photodefined, plasma or laser. The common drivers are: yield, new
equipment depreciation, new material (if any different from standard FR-4)
and labor for any added process steps. IMHO, whoever can get good yield
with any of these processes will be the winner.
Mason Hu
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