Patent ID: 8112168

Claim:
A manufacturing process, comprising the steps: providing a first workpiece of a first device type; providing a parameter target value for said workpiece; providing a first tool; computing a first tool setting for said first tool, such that said first tool setting includes a first tool offset divided by a first tool process factor, and a first device offset divided by said first tool process factor; performing a fabrication step on said workpiece using said first tool at said first tool setting; measuring a device parameter value of said workpiece after said fabrication step is performed; computing an error value, said error value being a difference between said measured device parameter value and said parameter target value; generating a value for a tool weight; generating a value for a device weight, such that exactly one of said tool weight and said device weight is assigned a non-interference value; generating an updated tool offset by adjusting a current tool offset of said first tool by a product of said tool weight and a sum of said error value and a difference between said first tool offset and said current tool offset; generating an updated device offset of said first device type by adjusting a current device offset of said first device type by a product of said device weight and a sum of said error value and a difference between said first device offset and said current device offset; providing a second workpiece; and performing said fabrication step on said second workpiece using said first tool or a second tool at an updated tool setting, said updated tool setting using at least one of said updated tool offset and said updated device offset, wherein if said first tool is used, said second workpiece is said first device type or a second device type, and if said second tool is used, said second workpiece is said first device type.