Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2008-01-17
2010-10-26
Lee, Jinhee J (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S748000, C361S760000, C361S761000, C174S255000, C174S260000, C174S261000, C174S262000
Reexamination Certificate
active
07821796
ABSTRACT:
Reference plane voids with a strip segment for improving transmission line integrity over vias permits routing critical signal paths over vias, while increasing via insertion capacitance only slightly. The transmission line reference plane defines voids above (or below) signal-bearing plated-through holes (PTHs) that pass through a rigid substrate core, so that the signals are not degraded by an impedance mismatch that would otherwise be caused by shunt capacitance from the top (or bottom) of the signal-bearing PTHs to the transmission line reference plane. In order to provide increased routing density, signal paths are routed over the voids, but disruption of the signal paths by the voids is prevented by including a conductive strip through the voids that reduces the coupling to the signal-bearing PTHs and maintains the impedance of the signal path conductor.
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Chun Sungjun
Haridass Anand
Weekly Roger D.
Baca Matthew W.
Chen Xiaoliang
Harris Andrew M.
Harris, Atty at Law, LLC Mitch
International Business Machines - Corporation
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