Dynamic Sense Current Adjustment for Memory Leakage
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Solution Overview
Problem
Resistance variable memory devices face issues with leakage current due to degradation and wear, leading to erroneous data sensing and reduced performance and lifetime, especially in high-density memory arrays.
Innovation Solution
The solution involves dynamically increasing the sense current magnitude when a threshold count of program operations is reached or when a high error rate is detected, allowing for accurate distinction between data states by compensating for leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory cell density is increased, then memory capacity is improved, but leakage current increases leading to erroneous data sensing
Solution Approach 1:
The patent applies dynamics by making the sense current magnitude adjustable rather than fixed. The sense current is dynamically increased when degradation is detected, allowing the system to adapt to changing conditions. This resolves the contradiction by enabling high density operation while maintaining sensing accuracy through adaptive current adjustment.
Solution Approach 2:
The patent changes the parameter of sense current magnitude in response to detected degradation. By monitoring program operation counts or error rates and adjusting the sense current accordingly, the system compensates for increased leakage current in high-density arrays, thereby maintaining data sensing accuracy despite higher cell density.
2Measurement precision
If sense current magnitude is increased to compensate for leakage, then data sensing accuracy is improved, but power consumption increases
Solution Approach 1:
The sense current magnitude is dynamically adjusted based on detected degradation levels rather than being constantly high. The system starts with a lower current and increases it only when program operation counts or error rates indicate degradation, thereby maintaining accuracy while minimizing unnecessary power consumption during early device life.
Solution Approach 2:
The patent applies partial action by increasing the sense current only to the extent necessary to compensate for detected leakage current. Rather than using a consistently high current, the system adjusts the current magnitude proportionally to the degradation level, achieving sufficient sensing accuracy with minimal excess power consumption.
3Productivity
If program operations are performed to store data, then memory functionality is improved, but degradation and wear increase leading to higher leakage current
Solution Approach 1:
The patent implements feedback by monitoring program operation counts or error rates and using this information to adjust the sense current magnitude. This closed-loop approach allows the system to compensate for degradation caused by program operations, maintaining reliable data sensing even as wear and leakage current increase with continued use.
Solution Approach 2:
The system performs preliminary monitoring of program operation counts or error rates to detect degradation trends before they severely impact performance. By proactively adjusting the sense current based on accumulated program operation counts, the system prevents sensing errors before they occur, maintaining reliability throughout the device lifecycle.
Data Source
AI summary
The present disclosure includes apparatuses, methods, and systems for increase of a sense current in memory. An embodiment includes a memory having a plurality of memory cells, and circuitry configured to count a number of program operations performed on the memory cells of the memory during operation of the memory, and increase a magnitude of a current used to sense a data state of the memory cells of the memory upon the count of the number of program operations reaching a threshold count.