Patent ID: 7383095

Claim:
An integration system for obtaining a set of overlay offset parameters for a first process layer having a first ID number which is going to be formed on a preceding process layer in a first photolithography tool having a third ID number with a first mask having a second ID number, wherein the preceding process layer is formed in a first pre-tool having a fourth ID number, the integration system comprising: means for receiving a set of variables including the first ID number, the second ID number, the third ID number and the fourth ID number from an input terminal; means for storing a process layer overlay offset parameter database in a memory storage media, wherein the process layer overlay offset parameter database comprises a plurality of process layer data pages and each process layer data page comprises: a historic-recorded data group having at least a historic-recorded overlay offset parameter set of a process layer corresponding to the process layer data page, wherein each historic-recorded overlay offset parameter set possesses relative information including a second mask with a fifth ID number, a second photolithography tool with a sixth ID number and a second pre-tool with a seventh ID number; a mask bias data bank having a plurality of mask bias data; a photolithography tool bias data bank having a plurality of photolithography tool bias data; and a pre-tool bias data bank having a plurality of pre-tool bias data; means for tracing a process layer data page by referring to the received first ID number; means for calculating a set of the overlay offset parameters of the first process layer by using a first historic-recorded overlay offset parameter set selected from the historic-recorded data group of the process layer data page and a set of bias data including the mask bias data corresponding to the second ID number and the fifth ID number, the photolithography tool bias data corresponding to the third ID number and the sixth ID number and the pre-tool bias data corresponding to the fourth ID number and the seventh ID number in the process layer data page; and means for refreshing the process layer overlay offset parameter database.