Nonvolatile Memory Management Cells Suppress Bitline Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional nonvolatile semiconductor memory devices face challenges in achieving high-speed read operations without operational errors due to noise interference from adjacent bit lines, which affects the accuracy and speed of data retrieval.
Innovation Solution
The implementation of a nonvolatile semiconductor memory device with a management memory and main memory integrated on the same chip, where dummy memory cell arrays are placed on both sides of operational memory cell arrays to minimize noise interference by keeping adjacent bit lines at a ground level, allowing for high-speed read operations without errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of memory cells arranged in a matrix is increased to store more information, then the storage capacity is improved, but the noise interference from adjacent bit lines during read operations increases
Solution Approach 1:
The patent extracts and removes the dummy memory cell arrays from the operational memory array, placing them in separate regions. This separation allows the dummy cells to be selectively activated to suppress noise without interfering with the operational memory cells' data storage function, thus resolving the contradiction between high storage capacity and noise interference.
Solution Approach 2:
The dummy memory cell arrays act as an intermediary element between adjacent bit lines. When activated, these dummy cells create a noise-suppressing effect that mediates the harmful noise interference between operational memory cells, allowing high-density storage while maintaining read operation accuracy.
2Reliability
If dummy memory cell arrays are added to suppress noise interference, then the read operation accuracy is improved, but the device complexity increases
Solution Approach 1:
The dummy memory cell arrays are designed to serve multiple functions: they suppress noise interference during read operations, maintain the bit line voltage levels, and can be selectively activated without affecting operational memory cells. This multi-functionality reduces the need for separate dedicated noise suppression circuits, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the noise suppression function with the existing memory cell structure by using dummy memory cells that are part of the same array architecture. This integration allows the noise suppression mechanism to be implemented within the existing device framework rather than adding completely separate systems, thus minimizing the increase in device complexity.
3Object-affected harmful factors
If dummy memory cell arrays are placed on both sides of operational memory cell arrays, then the noise interference from adjacent bit lines is minimized, but the manufacturing process complexity increases
Solution Approach 1:
The patent segments the memory device into distinct operational memory cell arrays and dummy memory cell arrays. This segmentation allows for modular manufacturing where each region can be processed independently, and the dummy arrays can be added as separate structures on both sides of the operational arrays, simplifying the overall manufacturing process compared to a monolithic design.
Solution Approach 2:
The dummy memory cell arrays are placed locally at specific positions on both sides of the operational memory cell arrays where noise interference is most prominent. This localized placement targets the noise suppression function to where it is most needed, rather than uniformly distributing complexity throughout the entire device, thus ease of manufacture.
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 configuration enables high-speed read operations with minimized noise interference, ensuring accurate and efficient data retrieval by preventing adjacent bit lines from affecting each other, thus enhancing the overall performance of the memory device.
Implementation Method 1
a coupling capacitance 22 between bit lines represents a line capacitance of adjacent bit lines between cell arrays forming 1 bit respectively
Data Source
AI summary
A nonvolatile semiconductor memory device has a high read output and is not affected by a noise of adjacent bit lines. The memory device is capable of performing high speed read operations. Each bit of a memory as formed by a plurality of memory cells. The memory cells each have the same structure as the structure of a memory cell of the main memory. During a read operation, the bit line is selected and proximate bit lines proximate to the selected bit line are not selected. The nonvolatile semiconductor memory device is formed together with the main memory on one chip by the same process.