Patent ID: 8332416
Filing Date: 2012-12-11
Classification: G05B,H01L,Y02P

Abstract:
1. A specification establishing method for controlling semiconductor process, comprising the steps of: providing a database and choosing a population from the database; sampling a plurality of sample groups from the population, each sample group being a non-normal distribution and having a plurality of samples; filtering the sample groups; summarizing the filtered sample groups to form a non-normal distribution diagram; getting a value-at-risk and a median by calculating from the non-normal distribution diagram; getting a critical value by calculating the value-at-risk and the median with a critical formula; getting a plurality of state values by calculating the filtered sample groups with a proportion formula; and getting an index value by calculating the non-normal distribution diagram with the proportion formula; thereby the state values present the states of the sample groups are abnormal or not by comparing the state values to the index value, wherein the critical formula is VaR is the value-at-risk, M is the median and V cri is the critical value.