Uncover the diffusion mechanism of atoms during electromigration test using non-stationary noise analysis

A non-stationary signal processing method - smoothed pseudo Wigner-Ville distribution (SPWD) is employed to investigate the frequency exponent variation and frequency characteristic trend of the electromigration noise. Comparison of the results by both the stationary signal processing tool-Fourier transform and SPWD-will be presented. It is found that the non-stationary analysis is more suitable in interpreting the noise of highly dynamic process like electromigration.