International Business Machines Corporation
Suppressing outlier drift coefficients while programming phase change memory synapses

Abstract:

A computer-implemented method for suppressing outlier drift of a phase change memory (PCM) device includes programming, by a controller, a conductance of the PCM device, wherein the programming includes configuring the conductance of the PCM device to a first conductance value at a first time-point, the first time-point being a programming time-point. The programming further includes determining, at a first pre-compensation time-point, that the conductance of the PCM device has changed to a second conductance value that differs from a target conductance value by no more than a predetermined threshold. Further, the programming includes, based on the above determination, reprogramming the PCM device to the first conductance value at a second time-point, including measuring said pre-compensation again, but at a second pre-compensation time-point.