Dynamic Zone Voltage Control for 3D Memory Reliability
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Solution Overview
Problem
Conventional nonvolatile memory devices face challenges in optimizing word line biasing due to variations in hole size, leading to deteriorated reliability and differing erase speeds, as they employ fixed zones that do not adapt to operational modes or the relative positioning of word lines.
Innovation Solution
A method and system for configuring word lines into dynamic zones based on zone configuration information, which varies according to operational modes such as program, read, or erase, using a zone controller and voltage generators to apply optimal voltages, allowing for adaptive zone control during operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed zones are used for word line biasing, then device structure is simple, but reliability deteriorates due to hole size variations and erase speed inconsistencies
Solution Approach 1:
The patent applies dynamics by transitioning from fixed zones to dynamic zones that can be reconfigured based on operational modes. The zone configuration information is varied according to program, read, or erase modes, allowing the memory device to adapt its zone structure dynamically. This resolves the contradiction by improving reliability through adaptive zone control while accepting increased device complexity in the form of zone configuration mechanisms.
Solution Approach 2:
The patent utilizes parameter changes by varying zone configuration information based on operational modes. Different zone configurations are applied for program mode, read mode, and erase mode to optimize performance for each specific operation. This approach improves reliability by tailoring zone parameters to operational requirements while introducing complexity through multiple configuration states.
2Productivity
If fixed zones are used, then device structure is simple, but erase speeds differ across zones due to hole size variations
Solution Approach 1:
The patent applies local quality by configuring different zones with specific characteristics suited for their functional requirements. Each zone can be optimized locally for its specific operational mode, allowing erase operations to proceed at consistent speeds across all zones by compensating for hole size variations through targeted zone configuration. This improves erase speed consistency while requiring zone configuration mechanisms.
Solution Approach 2:
The patent uses dynamics to reconfigure zones based on operational modes, allowing the system to adapt zone structures dynamically. During erase operations, zones are configured to account for hole size variations, ensuring consistent erase speeds across the memory device. This dynamic adaptation improves productivity in terms of erase speed consistency while introducing device complexity through configuration control.
3Reliability
If zones are configured dynamically based on operational modes, then reliability improves, but device complexity increases
Solution Approach 1:
The patent implements dynamics through dynamic zone configuration that adapts to operational modes. The zone controller receives zone configuration information varied according to program, read, or erase modes and reconfigures zones accordingly. This dynamic approach improves reliability by optimizing zone characteristics for each operational mode while necessarily increasing device complexity through the zone configuration control mechanism.
Solution Approach 2:
The patent applies parameter changes by varying zone configuration information based on operational modes. The system changes zone parameters dynamically to match operational requirements, improving reliability through mode-specific optimization. This necessarily introduces device complexity in the form of parameter control and configuration management.
4Productivity
If zone configuration information is varied according to operational modes, then performance is optimized, but control complexity increases
Solution Approach 1:
The patent uses dynamics to vary zone configuration information according to operational modes, allowing the system to optimize performance for each mode dynamically. The zone controller adapts zone configurations based on whether the operation is program, read, or erase, improving overall productivity while introducing control complexity through mode-dependent configuration management.
Solution Approach 2:
The patent applies parameter changes by varying zone configuration information based on operational modes. Different parameter sets are applied for program mode, read mode, and erase mode to optimize performance for each operation. This improves productivity through mode-specific optimization while necessarily increasing control complexity through parameter management.
Data Source
AI summary
A method is provided for driving a nonvolatile memory device, including multiple strings, where each string is formed by penetrating plate-shaped word lines stacked on a substrate. The method includes configuring the word lines of a string in multiple zones based on zone configuration information, and applying zone voltages to the zones, respectively. The zone configuration information is varied according to a mode of operation.