Memory Read Offset Calibration Using Charge Migration Proxies
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Solution Overview
Problem
Existing memory devices face challenges in accurately reading data due to charge loss phenomena such as slow charge loss, intrinsic charge loss, and lateral charge migration, leading to significant threshold voltage shifts and increased resource intensity in corrective read operations, which can delay data transmission and reduce reliability.
Innovation Solution
Implementing self-optimizing corrective read offsets through lateral charge migration proxies, using level information as a proxy for charge migration effects, to minimize complexity and maintain high accuracy in read operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional corrective read operations are used to compensate for charge loss, then data reading accuracy can be maintained, but the complexity of read operations increases and data transmission is delayed
Solution Approach 1:
The patent performs corrective read offset calibration in advance during manufacturing or initialization, storing the calibration results for later use. This preliminary action eliminates the need for complex real-time corrections during actual read operations, thereby maintaining data reading accuracy while reducing operational complexity and transmission delays
Solution Approach 2:
The patent creates a proxy model of charge migration effects based on calibration data, using this copy to predict and compensate for charge loss during read operations. Instead of performing complex real-time charge migration simulations, the system uses the pre-created proxy model to quickly determine corrective offsets, reducing computational complexity while maintaining accuracy
2Measurement precision
If real-time charge migration compensation is implemented, then reading accuracy improves, but resource consumption and operational complexity increase
Solution Approach 1:
The system performs energy-intensive charge migration calibration and characterization during manufacturing or initialization phases, storing the results for reuse. This preliminary energy investment creates a lookup table or calibration data that enables fast, low-energy corrections during actual read operations, significantly reducing real-time resource consumption while maintaining high reading accuracy
Solution Approach 2:
The patent changes the operational parameters from real-time complex charge migration simulations to simple offset additions based on pre-calibrated values. By transforming the problem from dynamic simulation to static parameter application, the system achieves the same accuracy with dramatically reduced computational resources and energy consumption during read operations
3Reliability
If comprehensive corrective measures for all charge loss phenomena are applied, then reliability improves, but device complexity and processing time increase
Solution Approach 1:
The patent performs comprehensive calibration for all charge loss phenomena (slow charge loss, intrinsic charge loss, lateral charge migration) during initialization, storing the corrective offsets for rapid application during read operations. This preliminary comprehensive analysis ensures high reliability through complete charge loss compensation while enabling fast read operations using pre-computed correction values, thus reducing actual data transmission time
Solution Approach 2:
The system dynamically selects the appropriate corrective offset based on the specific read conditions and cell state, using pre-calibrated data structures that enable rapid lookup and application. This dynamic selection approach maintains comprehensive reliability coverage while minimizing processing time by only applying necessary corrections rather than performing full re-analysis for each read operation
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
Improves memory performance and reliability by compensating for charge movement due to retention time, P/E cycles, and wordline group variability, reducing complexity while maintaining accuracy, akin to an infinite wordline aggressor implementation without increased complexity.
Implementation Method 1
charge loss phenomena such as slow charge loss, intrinsic charge loss, and lateral charge migration
Data Source
AI summary
A memory sub-system with a memory device having a plurality of cells, and the plurality of cells having a set of cells, and a processing device operatively coupled to the memory device, the processing device to perform operations of determining a level information associated with the set of cells, where the set of cells comprise a target cell associated with a read operation, identifying a read level offset for the target cell based on the level information, and performing the read operation in accordance with the read level offset.