Random telegraph noise in flash memories - model and technology scaling

This paper presents the first statistical model of Vt fluctuation (ΔVt<sub>cell</sub>) in a floating-gate flash memory due to random telegraph noise. It considers current-path percolation, which generates a large-amplitude-noise tail, caused by dopant induced surface potential non-uniformity It concludes that the impact of scaling is weaker than the widely-accepted 1/L<sub>eff</sub>W<sub>eff</sub> trend. 3-σ ΔVt<sub>cell</sub> is estimated to increase by 1.8x rather than ≫10x from 90 nm to 20 nm technology nodes.