Patent ID: 7858406

Claim:
A method of fabricating a device, the method comprising: providing a workpiece; forming a feed line having a first and a second end and a stress line of a test structure in a first conductive material layer disposed over the workpiece; forming at least one first via coupled to the second end of the feed line and at least one second via coupled to the stress line in a second conductive material layer adjacent to the first conductive material layer; forming a link between the at least one first via and the at least one second via in a third conductive material layer adjacent to the second conductive material layer; forming a first thermal heatsink physically contacting the first end of the feed line, the first thermal heatsink having a wing-shaped region, the wing-shaped region being wider than a width of the feed line, wherein the first thermal heatsink is formed in the first conductive material layer; and forming a second thermal heatsink in the third conductive material layer, at least one third via in the second conductive material layer physically contacting the second thermal heatsink and the first thermal heatsink.