Patent ID: 6722031
Filing Date: 2004-04-20
Classification: H05K,Y10S,Y10T

Abstract:
A method for making a printed circuit board (PCB), the method comprising the steps of:forming at least one power/ground core, each said at least one power/ground core comprising at least one layer of conductive material and at least one layer of fiber laminate, wherein the conductive material has coefficient of thermal expansion (CTE) that is lower than the CTE of a copper plane; forming a clearance hole through the entire thickness of each, said at least one power/ground core after the step of forming at least one power/ground cord; forming a composite by pressing together: all of said at least one power/ground core a patterned signal core, and at least one fiber laminate layer; and forming a plated through hole (PTH) in the composite, said PTH passing through the clearance hole of each said at least one power/ground core, said PTH not contacting any layer of said at least one layer of conductive material in each said at least one power/ground core.