Patent ID: 6150664
Filing Date: 2000-11-21
Classification: G03F,H01L

Abstract:
An apparatus for controlling the processing of a semiconductor wafer, comprising:an imager for obtaining a CD of a target feature on the wafer, the target feature formed using a first process, and for producing a target waveform corresponding to the target feature;a storage medium that stores:the target feature CD and the target waveform; anda plurality of reference waveforms corresponding to a plurality of reference features on a reference semiconductor wafer, the reference features having a CD and a waveform comparable to the target feature CD and target waveforms, each of the reference features respectively associated with a different known set of second process parameter values; anda processor configured to identify the reference waveform that most closely matches the target waveform to obtain the second process parameter values for performing a second process on the wafer.