Patent ID: 8581418

Claim:
A device comprising: a first die having a first side and a second side opposite to first side, the first side having a first region and a second region; a first metal bump of a first horizontal size formed on the first region of the first side of the first die; a second die bonded to the first side of the first die through the first metal bump; a dielectric layer over the first side of the first die and comprising a first portion directly over the second die, a second portion encircling the second die, and an opening exposing the second region of the first side of the first die; a second metal bump of a second horizontal size formed on the second region of the first side of the first die and extending into the opening of the dielectric layer, the second horizontal size being greater than the first horizontal size, wherein a top end of the second metal bump is higher than a top surface of the dielectric layer; and a first electrical component bonded to the first side of the first die through the second metal bump.