Patent ID: 6339256
Filing Date: 2002-01-15
Classification: H01L

Abstract:
A printed circuit board for chip-on-board applications, the printed circuit board comprising:a first dielectric layer including a top surface; a first conductive layer positioned adjacently above the top surface of the first dielectric layer and including an upwardly facing die-mounting surface within a chip-attach area of the first conductive layer for direct conductive attachment to a backside surface of a bare integrated circuit chip to establish at least one of electrical and thermal conduction between the top surface of the first conductive layer and a bare integrated circuit chip; a second dielectric layer positioned adjacently above the upwardly facing die-mounting surface of the first conductive layer, the second dielectric layer having an aperture therein to further define the chip-attach area of the first conductive layer and to receive a bare integrated circuit chip; a second conductive layer positioned adjacently below the first dielectric layer, the second conductive layer extending laterally underneath at least the chip-attach area of the first conductive layer, the second conductive layer vertically insulated from direct electrical communication with the first conductive layer; an insulative substrate positioned adjacently below the second conductive layer; and a layer of signal traces superimposed on the second dielectric layer in a substantially parallel relationship therewith, at least some of the signal traces of the layer of signal traces including bond pads for electrical connection to a front-side surface of a bare integrated circuit chip.