Variability analysis for sub-100 nm PD/SOI CMOS SRAM cell

We have studied the impacts of floating body effect, device leakage, and gate oxide tunneling leakage on the read and write stability of a PD/SOI CMOS SRAM cell under Vt, L and W variations in sub-100 nm technology for the first time. The floating body effect is shown to degrade the read stability while improving the write stability. On the other hand, the gate-to-body tunneling current improves the read stability while degrading the write stability. It is also shown that the use of high-Vt cell transistors can improve the read and write stability without causing significant performance degradation.