Dynamic Threshold Voltage Scan Resolution Control
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Solution Overview
Problem
Existing threshold voltage scan methods consume significant time and processing resources, and often scan unnecessary voltage ranges, particularly in flat regions of voltage distributions, which do not yield relevant data.
Innovation Solution
The method dynamically configures the resolution of the threshold voltage scan based on counter values and terminates the scan when a threshold quantity of memory cells is reached or a specific voltage is detected, reducing resource consumption by decreasing the resolution during flat regions and terminating the scan early.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant high resolution is used for threshold voltage scan, then measurement precision is improved, but loss of time and processing resources increases
Solution Approach 1:
The patent applies dynamics by making the scan resolution variable rather than constant. The resolution is dynamically adjusted based on the detected voltage distribution characteristics - using fine resolution when voltage changes are detected (non-flat regions) and coarse resolution when no voltage changes are detected (flat regions). This resolves the contradiction by adapting the measurement precision to the actual information content at each scan point.
Solution Approach 2:
The patent implements local quality by applying different resolution levels to different regions of the voltage distribution. Instead of uniformly high resolution across the entire scan range, the system uses high resolution only in regions where voltage transitions occur (where information is present) and low resolution in flat regions (where no information is present). This local adaptation reduces overall scan time while maintaining measurement precision where needed.
2Measurement precision
If a constant high resolution is used for threshold voltage scan, then measurement precision is improved, but processing resources consumption increases
Solution Approach 1:
The system dynamically adjusts processing resources allocated to scanning based on the detected voltage distribution. When flat regions are detected (indicating no memory cells at those voltage levels), the system reduces processing resources by using coarser resolution. When voltage transitions are detected, the system allocates full processing resources to maintain high measurement precision. This dynamic resource allocation resolves the contradiction between precision and resource consumption.
Solution Approach 2:
The patent applies local quality by concentrating processing resources only in regions of the voltage distribution where information exists. Instead of uniformly distributing high processing power across the entire voltage range, the system focuses resources on non-flat regions where voltage changes indicate actual memory cell states, thereby reducing overall processing resource consumption while maintaining precision where needed.
3Measurement precision
If the scan covers the entire voltage range, then measurement completeness is improved, but loss of time increases due to scanning flat regions
Solution Approach 1:
The patent extracts and eliminates the harmful portion of the scan process by identifying and skipping flat regions that do not contain useful information. The system detects when consecutive voltage levels produce identical read results (indicating a flat region with no memory cells), and terminates the scan early rather than continuing through these uninformative regions. This extraction of unnecessary scan portions reduces time loss while maintaining measurement completeness for relevant regions.
Solution Approach 2:
The patent applies partial action by performing the scan only over the necessary voltage range rather than the entire possible range. By detecting the actual voltage distribution boundaries and terminating the scan when flat regions are encountered, the system performs just enough scanning to obtain complete information about memory cell states, avoiding excessive action in regions that contribute no additional measurement value.
Data Source
AI summary
Methods, systems, and devices for threshold voltage scans are described. A memory device may receive a configuration for scanning a memory array during a scanning procedure. The memory device may read, during the scanning procedure, one or more memory cells of the memory array using a first voltage value that is indicated by the configuration. The memory device may store, during the scanning procedure, a first value in a first counter in response to reading the one or more memory cells of the memory array. The memory device may determine whether to terminate the scanning procedure in response to one or both of determining that the first quantity of memory cells satisfies a threshold quantity of memory cells or determining that the first voltage value satisfies a threshold voltage value to be scanned.