Patent ID: 6707685
Filing Date: 2004-03-16
Classification: H01L,H05K

Abstract:
A multi-layer wiring board comprising:an insulating substrate including a first insulating layer and a second insulating layer stacked on the first insulating layer, the insulating substrate having, on a central part of a top surface thereof, a semiconductor device mounting portion with a semiconductor device connecting electrode attached thereto, and having, on an under surface thereof, an external electrode for supplying electric power to the semiconductor device; a multilayered wiring including: a first group of parallel wiring lines formed on the first insulating layer, the parallel wiring lines, in each of divided sections that are obtained by dividing the multi-layer wiring board into several sections by two to four straight lines intersecting at a center of the first insulating layer in such a way that central angles of the divided sections are made substantially equal to each other, being so formed as to extend toward the intersection; a second group of parallel wiring lines formed on the second insulating layer, the parallel wiring lines, in each of the divided sections, being respectively arranged orthogonally with respect to the parallel wiring lines constituting the first group of parallel wiring lines; and a group of through conductors for providing electrical connection between the first and second groups of parallel wiring lines; and built-in capacitors provided in an interior of the insulating substrate, the built-in capacitors having a power source wiring layer and a ground wiring layer which are arranged to oppose each other via an insulating layer disposed therebetween, wherein electric power is supplied from the external electrode to the semiconductor device through the built-in capacitors, and wherein the built-in capacitors have mutually different resonance frequencies within a range from an operating frequency band for the semiconductor device to a frequency band for a harmonic component and are connected in parallel with each other, and at an anti-resonance frequency occurring between the different resonance frequencies, a composite impedance is set to be equal to or less than a predetermined value.