Floating body induced pre-kink excess low-frequency noise in submicron SOI CMOSFET technology

Abstract

The well-known post-kink Lorentzian-like noise overshoot has been empirically correlated to the ac kink effect in the SOI CMOSFET in the past. This work demonstrates the existence of a 1/f/sup 2/ excess noise spectrum (<100 Hz) superimposed upon 1/f noise in partially depleted (PD) floating body SOI CMOS when devices are biased in the pre-kink region (before the dc kink onset voltage). While the impact ionization phenomenon is negligible in the pre-kink region, the new observed pre-kink excess noise provides a new insight into the body voltage instability and current fluctuation in the SOI CMOSFET.