Investigation of Switching-Time Variations for Nanoscale MOSFETs Using the Effective-Drive-Current Approach

This letter investigates the impacts of random dopant fluctuation (RDF) and line edge roughness (LER) on the switching-time (ST) variation for nanoscale MOSFETs using the effective-drive-current (
1

_eff
) approach that decouples the ST variation into transition-charge (¿
Q
) and
1

_eff
variations. Although the RDF has been recognized as the main variation source to the threshold-voltage variation, this letter indicates that the relative importance of LER increases as the ST variation is considered.