Patent ID: 7691747
Filing Date: 2010-04-06
Classification: H01L

Abstract:
1. A method of making a semiconductor device, comprising: providing a substrate; forming a through substrate via (TSV) in the substrate, the TSV being formed by first etching a trench into a first surface of the substrate; lining the first surface of the substrate and the trench with a first insulating layer; patterning a resistive layer on the first insulating layer; patterning a first conductive layer on the first insulating layer, wherein patterns of the first conductive layer form plating within the TSV and simultaneously form a first terminal of an analog circuit formed on the first surface of the substrate, the patterned resistive layer forming portions of the analog circuit; depositing a second conductive layer on the first conductive layer, the first conductive layer providing adhesion of the second conductive layer; grinding a second surface of the substrate to expose the TSV on the second surface of the substrate; forming a second insulating layer over the second surface of the substrate; forming an under bump metallization (UBM) layer on the second surface of the substrate in electrical contact with the first and second conductive layers in the TSV, wherein the exposed TSV provides alignment of the UBM layer directly opposite the exposed TSV on the second surface of the substrate; depositing solder material on the UBM layer; and reflowing the solder material to form a solder bump, wherein the analog circuit electrically connects through the TSV to the solder bump on the back side of the substrate.