Yield measurement tests sites

The IBM East Fishkill Facility uniquely utilizes the yield management test sites (YMTSs) as the basis for all of its accelerated yield learning. The author reviews the evolution of the YMTS to the improvements required to ensure rapid root-cause analysis and timely corrective actions. The YMTS data analysis, which reveals a high correlation between the predicted and the actual product final test yields, and the design criteria that helped achieve it are discussed. The success of the YMTS in predicting the job-by-job final test yields of the product has been demonstrated. A few design and model enhancements are identified as the pivotal contributors to this success. The current state of the art in test site design is also briefly introduced.<>