Patent ID: 7400040

Claim:
An apparatus, comprising: an integrated circuit package substrate having a first surface area; a first material comprising a continuous metal layer of uniform thickness coupled to the integrated circuit package substrate and having a first coefficient of thermal expansion, and further having a second surface area; and a second material comprising a continuous metal layer of uniform thickness adjacent to the first material coupled to the integrated circuit package substrate and having a second coefficient of thermal expansion different from the first coefficient of thermal expansion to reduce an amount of warp across a surface of the integrated circuit package substrate within a selected temperature range, and further having a third surface area; wherein the second and third surface areas are substantially similar; wherein the first material and the second material are embedded in the integrated circuit package substrate; wherein the first material is located between the second material and a die coupled to the integrated circuit package substrate; and wherein the first material has a higher coefficient of thermal expansion than a coefficient of thermal expansion of the second material.