Read threshold estimation system using polynomial regression based calculations

By optimizing the read threshold voltage using a polynomial regression calculation method, the problem of high read error rate in memory systems was solved, resulting in more efficient data reading and improved reliability of memory systems.

CN116230031BActive Publication Date: 2026-07-10SK HYNIX INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SK HYNIX INC
Filing Date
2022-11-28
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies have problems with high read error rates and inability to effectively adjust them when determining the read threshold voltage in a memory system. This is especially true in multi-layer cell memories, where distortion and overlap of threshold voltage distribution lead to read failures.

Method used

A calculation method based on multinomial regression is adopted. Through mathematical modeling and multiple calculations, the optimal reading threshold voltage for the next reading operation is estimated. The selection of the reading threshold is optimized by using the product and normalization operation between the input and output matrices.

Benefits of technology

It improves the accuracy and efficiency of read operations, reduces read errors, and enhances the reliability and data access performance of the memory system.

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Abstract

A memory system and an operating method thereof are disclosed. The memory system includes a memory device and a controller. The controller determines, for each read operation, a mathematical model by using a) a function of a set of read threshold voltage among a plurality of read threshold voltages and b) a set of checksum values, determines a polynomial regression model based on the mathematical model, determines a set of parameters using a plurality of calculations between an input matrix and an output matrix based on the polynomial regression model, and estimates a next read threshold voltage for a next read operation based on the set of parameters. The controller calculates a mathematical operation algorithm to replace a normal multiplication operation, a normal division operation, and a normal multiplication-division operation.
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