Matching degradation of threshold voltage and gate voltage of NMOSFET after Hot Carrier Injection stress

Abstract

Device degradation modelling is more and more important for reliable circuit design. On MOSFET, the threshold voltage drift in time can lead to circuit performance degradation. In this study, VT shift due to Hot Carrier Injection stress is accelerated on small width devices. VT matching is also degraded during stress as a function of VT deterioration. This width dependence allows explaining gate voltage matching behavior in the sub-threshold area used in low power analog applications.