Patent ID: 7759776
Filing Date: 2010-07-20
Classification: G01R,H01L

Abstract:
1. A space transformer (ST) substrate, comprising: a substrate having two major faces with a plurality of openings in a single one of the two major faces, each opening partially filled with a conductive layer at the bottom thereof; a respective first conductive material layers in each of the openings, the first conductive material layers filling a remainder of each of the plurality of openings and having a substantially round top surface, the top surface having a diameter that is greater than a width of the openings at a top of the openings, wherein the substrate is formed from a single piece of material that includes a respective bottom wall in each opening contacting a bottom surface of the conductive layer in each respective opening, and the substrate includes respective side walls in each opening that contact side walls of the conductive layer and sides of the first conductive material layer in each respective opening, the side walls extending up to the top of each opening; and a plurality of second conductive material layers substantially conformal over the first conductive material layers, covering a major portion of the round top surface of the first conductive material layers.