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We have several designs of motherboards that use buried resisters for
pull-up impedance, thus eliminating the need for resister packs or including
this requirement on already densely populated card assemblies. We have
realized benefits of increased I/O support and realized reduced cabinet
sizes with this technique. The reduced cabinet size benefits weight, cost,
natural frequency, and cooling.
These are all positives and there are a few drawbacks related to the
supplier base. Several manufactures realize the cares needed and are doing
a great job.
Kevin Thorson,
Loral Defense Systems - Eagan
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From: TechNet-request
To: Technet
Subject: Buried Resistors
Date: Tuesday, February 27, 1996 4:09PM
My company is investigating building buried resistors into multilayer PCB's.
Is there a demand for PCB's containing buried resistors to be produced in
volume? What type of technologies are contained on these boards
(line/space, BGA, buried via's, etc.)
Are there any shops currently producing them in volume?
nwbluez
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