专利名称：Printed circuit board having outer power
planes
发明人：John Thomas Fessler,Keith Bryan Hardin,Eric
Wayne Westerfield
申请号：US10408951申请日：20030408
公开号：US20040201971A1公开日：20041014
专利附图：
摘要：A multi-layer printed circuit board (PCB) routes signal traces on internal signallayer(s) and includes power planes on the two outermost layers. The outer layers are
maintained at the same non-ground voltage level, and are electrically connected by aseries of vias that circumscribe signal traces on the internal layer(s). With a preferredmaximum spacing of one-tenth the wavelength of electromagnetic energy generated bythe signal traces, the vias, together with the outer power planes, contain electromagneticenergy within the PCB. One or more of the outer planes may include a second powerplane area maintained at a different voltage. The two power plane areas are connectedby decoupling capacitors, located proximate underlying signal traces that traverse thetwo power plane areas.
申请人：FESSLER JOHN THOMAS,HARDIN KEITH BRYAN,WESTERFIELD ERIC WAYNE
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