Semiconductor Storage Device With Floating Word-Line Verification
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Solution Overview
Problem
Existing storage devices face challenges in accurately storing and outputting data due to defective components, which can lead to data inaccuracies.
Innovation Solution
A semiconductor storage device with a memory cell transistor, bit line, word line, sense amplifier, and control circuit that performs operations to accurately acquire data using current flows and electrical floating states to enhance data storage and output accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional data storage and sensing operations are performed using a single voltage state, then the operation is simple and fast, but data accuracy deteriorates due to defective components
Solution Approach 1:
The control circuit performs a preliminary floating verification operation before the main data sensing operation. This preliminary action detects defective word lines by temporarily floating them, allowing the system to identify and exclude defective components before they can corrupt the actual data storage or sensing operations, thereby improving data accuracy without significantly impacting overall performance
Solution Approach 2:
The control circuit uses the result of the floating verification operation as feedback to determine whether to proceed with normal data operations or to activate alternative handling for defective word lines. This feedback mechanism allows the system to adapt its operation based on the detected component quality, ensuring high data accuracy while maintaining efficient operation for non-defective components
2Reliability
If floating verification operations are performed to detect defective word lines, then data storage accuracy is improved, but the operation time increases
Solution Approach 1:
The floating verification operation is performed selectively and partially - only on word lines that need to be verified before data operations, and only to the extent necessary to detect defective lines. The control circuit integrates this verification into the existing data sensing timing, performing the floating operation during periods when no actual data storage is occurring, thus improving reliability while minimizing time loss
Solution Approach 2:
The floating verification is performed periodically at specific intervals during the data sensing operation rather than continuously. The control circuit schedules the floating verification to occur at optimal moments in the operation cycle, ensuring defective word lines are detected without unnecessarily extending the overall operation time
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
The device achieves high-accuracy data storage and output by utilizing a control circuit to execute operations that enhance data sensing and verification, mitigating the impact of defective components.
Implementation Method 1
acquiring first data based on a first current flowing to a bit line while a first voltage is applied to a word line
Implementation Method 2
acquiring second data based on a second current flowing to the bit line while the word line is placed in an electrically floating state
Data Source
AI summary
A semiconductor storage device that stores data with high accuracy is provided. The semiconductor storage device includes a memory cell transistor, a bit line connected to the memory cell transistor, a word line connected to the memory cell transistor, a sense amplifier connected to the memory cell transistor, and a control circuit configured to execute a first operation. The first operation includes acquiring first data using the sense amplifier based on a first current flowing to the bit line while a first voltage is applied to the word line, and then acquiring second data using the sense amplifier based on a second current flowing to the bit line while the word line is placed in an electrically floating state.