Patent ID: 6444921
Filing Date: 2002-09-03
Classification: H01L,H05K

Abstract:
An interposer for electrically coupling a first electrical component to a second electrical component, said interposer comprising:a first substrate having a first surface, a second surface, and a first coefficient of thermal expansion as measured at its first surface; a second substrate separate from said first substrate, said second substrate having a first surface, a second surface, and a second coefficient of thermal expansion as measured at its first surface, said second coefficient of thermal expansion being different from said first coefficient of thermal expansion; a plurality of electrical connection areas located over the first surface of the first substrate; a plurality of electrical connection areas located over the first surface of the second substrate; a flexible-circuit layer disposed between each of said first and second substrates and having a first portion attached to the first surface of said first substrate and a second portion attached to the first surface of said second substrate; and a plurality of electrical traces, each said trace having a first end located at a connection area over said first substrate, having a second end located at a connection area over said second substrate, and passing through said flexible-circuit layer.