SNR ESTIMATION IN ANALOG MEMORY CELLS

摘要

A method includes programming a group of analog memory cells by writing respective analog values into the memory cells in the group. After programming the group, the analog values are read from the memory cells in the group using a set of read thresholds so as to produce readout results. Respective optimal positions for the read thresholds in the set are identified based on the readout results. A noise level in the readout results is estimated based on the identified optimal positions of the read thresholds.

主权项

1. An apparatus, comprising:
an interface configured to communicate with a memory that includes a plurality of memory cells; and storage circuitry configured to:
store data into a subset of the plurality of memory cells;read stored data from memory cells of the subset using a set of read voltage thresholds to generate a respective set of readout results of a plurality of readout results;assess an information entropy of the plurality of readout results; andestimate a noise level in the plurality of readout results dependent upon the assessed information entropy.