摘要(英) |
ABSTRACT
In this paper, we recalculate the characteristic parameters of wafer maps in different orientations for the classified wafer maps in previous research. We analyze the difference between new parameters and original wafer parameters, and what effect does it have on the randomness test of wafer maps?
In the past, we used Number of Bad Die (NBD) and Number of Contiguous Line (NCL) to generate Boomerang. We propose B-score as a standard for judging wafer maps. At that time, we always fixed the same orientation of wafer maps when calculating NCL. Now, we generate wafer maps in seven different orientations by rotating and flipping the wafer map. In essence, the seven wafers are still the same as the original wafer. However, due to the way NCL is calculated, it may cause numerical changes. Eventually, the randomness test may also be different.
In this paper, we explore whether the seven clones and the original wafer is consistent in the randomness test to ensure that our test is reliable. |
參考文獻 |
參考文獻
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