Methodology for the statistical evaluation of the effect of random telegraph noise (RTN) on RRAM characteristics

Abstract

We introduce a figure of merit (FoM) to quantify RRAM read current instability, a complex multi-level RTN-like signal, generally observed in read current. Log(FoM) follows a normal statistical distribution describing the probability of occurrence of a read current fluctuation of a given amplitude. We demonstrate that peak-to-peak RTN amplitude decreases with the reduction of the read current that enables scaling down RRAM operating currents. The developed statistical model for the read instability allows to estimate the maximum size and minimum operating current for reliable operations of high density RRAM array.