Patent ID: 8164171
Filing Date: 2012-04-24
Classification: H01L

Abstract:
1. A system-in package comprising: a first polymer layer; a first chip in the first polymer layer; a first metal layer over the first chip and over a top surface of the first polymer layer, wherein the first metal layer is connected to the first chip; a second polymer layer over the first polymer layer, over the first chip and over the first metal layer; a second chip in the second polymer layer, wherein the second chip comprises a first metal bump at a top of the second chip and in the second polymer layer; a second metal bump in the second polymer layer and over the first metal layer, wherein the second metal bump is connected to the first metal layer, wherein the second metal bump is higher than the first metal bump, wherein a top surface of the first metal bump and a top surface of the second metal bump are not covered by the second polymer layer; and a second metal layer on the top surface of the first metal bump, on the top surface of the second metal bump and over a top surface of the second polymer layer, wherein a first interface is between the first metal bump and the second metal layer, and a second interface is between the second metal bump and the second metal layer, wherein the second metal layer connects the first metal bump to the second metal bump, wherein the first metal bump is connected to the first chip through, in sequence, the second metal layer, the second metal bump and the first metal layer.