Non-Volatile Memory Cell Self-Annealing for Defect Recovery
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Solution Overview
Problem
The useful life of non-volatile solid-state memory cells is shorter than the devices themselves due to progressive degeneration from program/erase cycles, leading to increased bit errors and wear-out, which existing technologies fail to effectively extend without additional heating.
Innovation Solution
Implementing a self-annealing process that transfers memory cells to a temporary list where they experience the same or lower temperature as active cells, allowing defects to reduce over time without additional heat, using the Arrhenius equation to determine optimal annealing time, and transferring them back when a decrease in bit error rate is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If memory cells are continuously operated in the active list, then accessibility and operational availability are maintained, but bit error rate increases and useful life decreases due to progressive degeneration
Solution Approach 1:
The patent applies preliminary action by transferring memory cells to a temporary list before they completely fail, allowing annealing to occur while they are still functional. This preventive maintenance approach reduces bit error rates by treating interfacial defects early in the degradation process, extending the operational life of memory cells without requiring replacement
Solution Approach 2:
The patent implements self-service by using the memory device's own operational temperature to anneal interfacial defects in memory cells. The natural heat generated during normal operation is utilized to reduce bit error rates, eliminating the need for external heating systems or additional energy input while maintaining data reliability
2Reliability
If traditional annealing methods are used to reduce bit error rates, then reliability improves, but additional heating mechanisms and device complexity increase
Solution Approach 1:
The patent uses the memory device's own operational temperature to anneal interfacial defects, eliminating the need for external heating mechanisms. The natural heat generated during normal read/write operations is sufficient to reduce bit error rates, simplifying the device architecture while maintaining reliability
Solution Approach 2:
The patent converts the harmful heat that could accelerate degradation into a beneficial annealing effect. The operational temperature, which could potentially increase bit error rates through thermal stress, is instead utilized to reduce interfacial defects and improve data reliability, turning a potential harm into a benefit
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method extends the life expectancy of memory cells by reducing bit error rates and maintaining data reliability, providing a longer operational life for memory devices without the need for additional heating, thus enhancing the overall performance and longevity of non-volatile memory devices.
Implementation Method 1
the memory cells included in the temporary list are maintained at a temperature that is substantially the same as or lower than that of memory cells included in the active list
Data Source
AI summary
A group of non-volatile, solid state memory cells are transferred from an active list that includes memory cells accessible to a host to a temporary list that includes memory cells temporarily inaccessible to the host. The memory cells included in the temporary list are maintained at a temperature that is substantially the same as or lower than that of memory cells included in the active list. The memory cells are transferred from the temporary list to the active list in response to satisfaction of a trigger condition.