Anomalous accelerated negative-bias- instability (NBI) at low drain bias
Kin P. Cheung
We observed at very low drain bias an anomalous acceleration of Negative-bias-instability at room temperature, as if the channel temperature has been raised significantly. The channel width and channel length dependent of this acceleration suggest that in addition to the conventional self-heating effect that raises the lattice temperature, there is indication that hot holes thermalized at a temperature (Te) higher than the lattice temperature (TL) is the cause of this anomaly. Analysis of the frequency dependent of drain bias modulation, as well as the wave shape dependent of the modulation support this explanation.