Patent ID: 7030480
Filing Date: 2006-04-18
Classification: H01L,H05K

Abstract:
1. A multilayer board, comprising: an insulation material, a grounding layer formed in the insulation material, and inter-layer-connected by a grounding via, a power supply layer formed in the insulation material, and interlayer-connected by a power supply via, a signal layer formed in the insulation material, and inter-layer-connected by a signal via, a power supply land formed at the bottom surface of the insulation material, and connected to the power supply layer and to an external point, a signal land formed at the bottom surface of the insulation material, and connected to the signal layer and to an external point, a bottom grounding layer having a plurality of clearances which the power supply land and the signal land are individually formed within, and wherein the bottom grounding layer is provided with a conductive film connection terminal formed by a conductive film, and wherein the power supply land and the signal land are respectively each provided with solder ball connection terminals formed by solder balls.