Patent Document ID: 20090292386
Application ID: 12207706
Patent Flag: 0

Claim One:
1. A system for automatic virtual metrology (AVM), comprising: a first process apparatus having a plurality of sets of historical process data and a set of first process data, wherein said first process apparatus produces a first workpiece in accordance with said set of first process data; a first metrology equipment having a plurality of historical measurement values and a first actual measurement value of said first workpiece, wherein said historical measurement values are the actual metrology data of the workpieces respectively produced by using said sets of historical process data; a first AVM server used for collecting said sets of historical process data and said historical measurement values; a model-creation server used for building a set of VM (Virtual Metrology) models by using said sets of historical process data and said historical measurement values; a second process apparatus used for producing a second workpiece in accordance with a set of second process data; a second metrology equipment used for measuring a second actual measurement value of said second workpiece; and a second AVM server used for conducting virtual metrology on said second workpiece by using said set of VM models, wherein said second AVM server is used for retraining or tuning said set of VM models therein by using said set of second process data and said second actual measurement value to replace the oldest data in said sets of historical process data and said historical measurement value.