Patent ID: 6959252
Filing Date: 2005-10-25
Classification: G05B,Y02P

Abstract:
1. A method for analyzing in-line quality control (QC) test parameters, the method being used to analyze a plurality of lots of products, each lot of products comprising a lot number, the products being formed using a plurality of equipments, at least one wafer of each lot of products being tested by at least one in-line QC test item to generate an in-line QC test parameter, the in-line QC test item, and its related sample test item and wafer test item being stored in a database, the database further storing the in-line QC test parameter and data of a plurality of lots of high-yield product stocks, such as test items and test parameters, the method comprising: analyzing the in-line QC test parameter of the wafer to determine whether the in-line QC test parameter corresponds to a predetermined spec or not; searching the database to find out the sample test item or the wafer test item related to the in-line QC test item when the in-line QC test parameter of the wafer does not correspond to the predetermined spec; searching the database to find out the corresponding test parameters in the sample test item or the wafer test item of the high-yield product stocks according to the in-line QC test item and the searched sample test item or the wafer test item; and using the in-line QC test parameter of the wafer and the searched test parameters in the sample test item of the high-yield product stocks to generate a correlation to illustrate the relationship between the in-line QC test item and the sample test item and using the in-line QC test parameter of the wafer and the correlation to predict a test parameter for the wafer in the sample test item, or using the in-line QC test parameter of the wafer and the searched test parameters in the wafer test item of the high-yield product stocks to generate a correction to illustrate the relationship between the in-line QC test item and the wafer test item and using the in-line QC test parameter of the wafer and the correlation to predict a test parameter for the wafer in the wafer test item.