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Wafer Yield Estimation Using Support Vector Machines
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Industrial Applications
Wafer Yield Estimation Using Support Vector Machines
Lei-Ting Chen1 , David Lin2, Dan Muuniz2 and Chia-Jiu Wang2 
| (1) |
School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China |
| (2) |
Department of Electrical and Computer Engineering, University of Colorado at Colorado Springs, Colorado Springs, CO, USA |
Abstract
Wafer yield estimation is a very complicated nonlinear problem due to many variations in fabrication processes at different
silicon foundries. The purpose of this paper is to use Support Vector Machines (SVMs) to analyze and predict electrical test
data, which are traditionally captured by probing each chip on the wafer. The predicted data produced by the support vector
machines is then compared with the known measured data to determine the accuracy. Once the SVM has captured nonlinear relationship
between fabrication processes and wafer yields, it can be used to predict wafer yield in other lots fabricated by the same
silicon foundry. The advantage of using this approach is to save time due to probing hardware constraints, predict wafer yield
across the same fabrication process and give an alternative method of device simulation. Our experiments show that the SVMs
predict more accurate than classical device physics equations and in some cases SPICE simulation software in comparison with
the actual measured electrical data. Electrical data used for this research include threshold voltages, saturation currents,
and leakage currents.
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