Patent ID: 7525175
Filing Date: 2009-04-28
Classification: H01G,H01L,H05K

Abstract:
1. A package substrate with a built-in capacitor, comprising: a plurality of power supply pads; a plurality of ground pads provided in the same layer as the power supply pads; a thin-film capacitor that includes a high dielectric layer and first and second thin-film electrodes sandwiching the high dielectric layer, where the first thin-film electrode includes a plurality of first thin-film small electrodes and the second thin-film electrode includes a plurality of second thin-film small electrodes; an insulating layer that is disposed between the thin-film capacitor and the layer with the plurality of pads; and internal wirings which wire someone the first thin-film electrodes electrically insulated from the second thin-film electrodes to make a wiring having either of a power supply potential or a ground potential, wire some of the second thin-film electrodes electrically insulated from the first thin-film electrodes to make a wiring having the other potential, and make one of the first thin-film small electrodes and one of the second thin-film small electrodes that are electrically short-circuited to each other via an unnecessary conductive portion generated in the high-dielectric layer become a potential independent from both of the ground potential and power supply potential.