Memory Cell Calibration with QLC Charge-Loss Proxy Tracking

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Solution Overview

Problem

Conventional methods for tracking and calculating charge loss in memory cells require separate measurement circuits and dedicated resources for each type of memory cell, leading to inefficiencies and increased resource utilization.

Innovation Solution

A calibration mechanism that leverages the charge loss characteristics of higher density memory cells (QLCs) to estimate and track the charge loss of lower density cells (TLCs) using a translation mechanism, eliminating the need for separate resources by utilizing existing circuits and routines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If separate measurement circuits and dedicated resources are used for each type of memory cell, then measurement precision is improved, but device complexity and resource requirements increase

Engineering Contradiction:

Improvecharge loss measurement precisionVSAvoidmeasurement circuit complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a single measurement circuit that can measure charge loss for multiple types of memory cells (QLCs, TLCs, MLCs, SLCs) through a unified calibration mechanism. The system uses a general-purpose measurement circuit combined with translation mechanisms and calibration data structures to handle different cell types, eliminating the need for separate dedicated measurement circuits for each cell type while maintaining measurement precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces translation mechanisms as intermediaries that convert charge loss measurements from one memory cell type to another. The calibration mechanism uses translation tables and algorithms to map charge loss characteristics from reference cells to target cells, enabling indirect measurement and reducing the need for direct measurement circuits for every cell type.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If dedicated resources are allocated for each memory cell type, then measurement precision is improved, but loss of time and productivity decrease

Engineering Contradiction:

Improvecharge loss tracking precisionVSAvoidcalibration time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent implements preliminary action through advance calibration procedures where charge loss characteristics are measured and stored in calibration data structures before actual operation. The system performs calibration measurements in advance, creates translation tables mapping different cell types, and stores this information for rapid lookup during operation, eliminating the need for time-consuming real-time calibration for each cell type.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses copying by creating virtual representations of charge loss characteristics through translation mechanisms. Instead of directly measuring every cell type, the system copies charge loss data from reference cells and uses translation algorithms to generate equivalent representations for other cell types, significantly reducing measurement time while maintaining precision.

Inventive Principle:

Principle #26Copying

3Measurement precision

If multiple separate measurement circuits are used for different memory cell types, then measurement precision is improved, but use of energy increases

Engineering Contradiction:

Improvecharge loss measurement accuracyVSAvoidenergy consumption of measurement circuits

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent merges multiple separate measurement circuit functions into a single unified measurement circuit. By combining the measurement capabilities for different cell types into one shared circuit, the system reduces the total number of active circuits and their associated energy consumption while maintaining measurement precision through the translation and calibration mechanisms.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies universality by designing a single measurement circuit that serves multiple purposes across different memory cell types. This multi-functional circuit performs charge loss measurements for QLCs, TLCs, MLCs, and SLCs using the same hardware, thereby reducing overall energy consumption compared to having separate dedicated circuits for each cell type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250315180A1Apparatus with memory cell calibration mechanism and methods for operating the same

Publication Date: 2025.10.09 MICRON TECHNOLOGY INC

AI summary

Methods, apparatuses and systems related to tracking charge loss are described. An apparatus may include a tracking mechanism configured to make direct measurements for tracking charge loss in first-type cells. The apparatus may be configured to designate a set of the first-type cells as proxy for modeling charge loss at second-type cells having a different storage density than the first-type cells. The apparatus may use the tracking mechanism to make measurements on the proxy set of the first-type cells and translate the measurement to account for the charge loss at the second-type cells.