Patent ID: 7358607

Claim:
A substrate to mount a die having at least one input signal terminal, the substrate keeping an impedance variation between an input signal entering the substrate from a receiving substrate and an output signal provided to the at least one input terminal below a predetermined value, the substrate comprising: a dielectric core member having an approximate thickness of 800 microns; a first plurality of dielectric lamination layers on a first side of the dielectric core member, each having an approximate thickness of 30 microns, and wherein the dielectric core member comprises material of different dielectric permittivity in comparison to a permittivity of material of the dielectric lamination layers; a second plurality of conductive layers on the first side of the dielectric core member, each having an approximate thickness of 25 microns, and including at least one connector on a first surface of an uppermost one of the second plurality of conductive layers to couple to the at least one input signal terminal of the die; and a single conductive layer on a second side of the dielectric core member, having an approximate thickness of 17 microns, wherein the single conductive layer comprises at least one land to couple to the input signal from the receiving substrate.