Patent ID: 7003366
Filing Date: 2006-02-21
Classification: G06N

Abstract:
1. A diagnostic system for a semiconductor process, comprising: means for receiving a set of variables including a tool information of a first tool, a process information with respect to a first process performed by the first tool and at least a set of real-time process parameters of the first tool obtained during the first process is performed by the first tool; means for storing a knowledge database comprising a plurality of sets of historic process performance data, a plurality of sets of historic process parameters, a plurality of sets of historic process parameter membership functions and a plurality of sets of process performance membership functions; means for retrieving a portion of the historic process parameter sets from the knowledge database with reference to the received tool information and the received process information; means for approximately matching the received set of real-time process parameters with the retrieved sets of the historic process parameters to trace a candidate set of the historic process performance data corresponding to the matched set of the historic process parameters; means for fuzzifying each of the received real-time process parameters by using the corresponding sets of the process parameter membership functions to correspondingly generate a set of process parameter fuzzy values; means for applying a set of fuzzy rules corresponding to the first process to the set of process parameter fuzzy values with the candidate set of the historic process performance data and the corresponding sets of the process performance membership functions to generate a plurality of sets of metrology fuzzy sets; and means for defuzzifying the sets of metrology fuzzy sets to generate an alarm index.