CEA Assigned Patent

Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA), Paris, France, has been assigned a patent (10,755,754) developed by La Barbera, Selina, Castellani, Niccolo, Navarro, Gabriele, and Vianello, Elisa, Grenoble, France, for a “analog method for programming a phase change memory cell by means of identical electrical pulses.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A method for programming a phase change memory cell placed in an initial crystalline state, the memory cell being called of taking a plurality of resistance values belonging to a range of values called “programming window”, the method including parameterizing a lower limit of the programming window by applying to the memory cell a single gradual writing voltage pulse or a first series of identical gradual writing voltage pulses, progressively adjusting the resistance value of the memory cell by the following operations: a gradual erasing operation during which a series of identical gradual erasing voltage pulses is applied to the memory cell, a gradual writing operation during which a second series of identical gradual writing voltage pulses is applied to the memory cell, the gradual writing and gradual erasing voltage pulses have a width less than 50 ns.”

The patent application was filed on March 8, 2019 (16/296,834).