The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2025
Filed:
Oct. 10, 2023
International Business Machines Corporation, Armonk, NY (US);
Radu Ioan Stoica, Zurich, CH;
Nikolaos Papandreou, Thalwil, CH;
Roman Alexander Pletka, Uster, CH;
Charalampos Pozidis, Thalwil, CH;
International Business Machines Corporation, Armonk, NY (US);
Abstract
The invention relates to a method of operating a memory device comprising memory cells for storing information on N voltage levels separated by N−1 threshold voltages, the method comprising: obtaining a plurality of threshold voltage shift (TVS) patterns, each comprising N−1 TVS reference values representing expected shifts of the threshold voltages of a set of memory cells having a specific physical condition; assigning a matching TVS pattern to the set of memory cells; storing differences between actual TVS values of the memory cells and corresponding TVS reference values of the matching TVS pattern as TVS residual values; upon a reading instruction for a specified memory cell, determining restored TVS values by combining the matching TVS pattern of the corresponding set of memory cells with corresponding TVS residual values; and reading the information from the specified cell using the restored TVS values.