An efficient statistical analysis methodology and its application to high-density DRAMs

A new approach for the statistical worst case of fall-chip circuit performance and parametric yield prediction, using both the modified-principal component analysis (MPCA) and the gradient method (GM), is proposed and verified. This method enables designers not only to predict the standard deviations of circuit performances but also track the circuit performances associated with the process shift using wafer test structure measurements. This new method is validated experimentally during the development and production of high density DRAMs.