Patent ID: 7521952
Filing Date: 2009-04-21
Classification: G01R

Abstract:
1. A method for electromigration stress testing, the method comprising: providing an array of a plurality of multilink test sets, each multilink test set including a plurality of metal lines positioned within a dielectric material and connected in a serial configuration, each multilink test set being connected in a parallel configuration with the other multilink test sets, the parallel configuration including a first electrical connection to a cathode end of a first metal line in each multilink test set and a second electrical connection to an anode end of a last metal line in each multilink test set, wherein the providing further includes providing the array with N number of metal lines wired in the serial configuration in each multilink test set and M number of the multilink test sets connected in the parallel configuration; stressing the metal lines and assuming a failure when a single metal line fails; converting cumulative distribution function (CDF) values of each array to a corresponding CDF value of a single metal line; and fitting the CDF values and failure times of the array to a failure distribution to determine the statistical parameters of a single metal line, wherein a failure distribution is a lognormal failure distribution.