Patent ID: 7851237

Claim:
A method of fabricating a semiconductor device, the method comprising: providing a workpiece; forming a feed line over the workpiece; forming a stress line over the workpiece; forming a conductive feature between the feed line and the stress line; disposing a temperature adjuster proximate the conductive feature, wherein the temperature adjuster is configured to actively heat and cool the conductive feature; and coupling at least one feedback device to the temperature adjuster and the conductive feature, wherein the at least one feedback device comprises a controller including an input and an output, wherein the at least one feedback device further comprises a first temperature determinator, a second temperature determinator, and a signal summer, the first temperature determinator including a first input, a second input, and an output, the second temperature determinator including a first input, a second input, and an output, wherein the first input of the first temperature determinator is coupled to a first side of the conductive feature, wherein the second input of the first temperature determinator is coupled to a second side of the conductive feature, wherein the output of the first temperature determinator comprises a first signal indicating the temperature of the conductive feature, wherein the first input of the second temperature determinator is coupled to a first side of the stress line, wherein the second input of the second temperature determinator is coupled to a second side of the stress line, wherein the output of the second temperature determinator comprises a second signal indicating the temperature of the stress line, wherein the output of the first temperature determinator, the output of the second temperature determinator, and an offset signal are coupled to a plurality of inputs of the signal summer, and wherein an output of the signal summer is coupled to the input of the controller.