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US 2015/0318037 A1Published application
Snr estimation in analog memory cells
AssigneeApple Inc.
InventorsTomer Ish-Shalom, Ronen Dar
Life of this patent
Estimating the term…
Abstract
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.
Claims20
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;
- and
- estimate a noise level in the plurality of readout results dependent upon the assessed information entropy.
5 more elements
A method, comprising:
- storing data into a subset of a plurality of memory cells;
- reading 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;
- assessing an information entropy of the plurality of readout results;
- and
- estimating a noise level in the plurality of readout results dependent upon the assessed information entropy.
2 more elements
An apparatus, comprising:
- a memory including 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;
- and
- estimate a noise level in the plurality of readout results dependent upon the assessed information entropy.
5 more elements
Dependencies are inferred from the claim text.