Volatile Memory Device Complementary Bit Line Relocation
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Solution Overview
Problem
Volatile memory devices with an open bit line structure face inefficiencies due to unnecessary space and reduced integration density, limiting their performance and capacity.
Innovation Solution
The design incorporates a row decoder and column decoder with a memory cell array, featuring a sense amplifier and complementary bit lines, where the complementary bit lines are embedded in peripheral circuits rather than the cell region, reducing area and enhancing density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an open bit line structure is used in volatile memory devices, then the bit line can be simply structured, but unnecessary mat space is created reducing integration density
Solution Approach 1:
The patent extracts the complementary bit line from the cell region and relocates it to the peripheral circuit region. This separation removes the unnecessary mat structure from the cell array area, eliminating the space waste while preserving the open bit line structure's simplicity. The complementary bit line is taken out of the cell region and placed in the peripheral circuit region where it belongs.
Solution Approach 2:
The patent utilizes the vertical dimension by placing the complementary bit line in a different spatial layer or region. Instead of having the complementary bit line occupy horizontal space within the cell array, it is positioned in the peripheral circuit region, effectively using vertical or lateral separation to resolve the space conflict.
2Ease of operation
If complementary bit lines are positioned in the cell region, then the sense amplifier can perform read/write operations, but the area occupied by the memory device increases
Solution Approach 1:
The complementary bit line is extracted from the cell region and relocated to the peripheral circuit region. This extraction maintains the functional connectivity needed for read/write operations while removing the space-occupying element from the cell array, thereby reducing the overall memory device area.
Solution Approach 2:
The patent segments the memory device into distinct functional regions: the cell region containing only necessary bit lines for memory cells, and the peripheral circuit region containing the complementary bit lines and sense amplifiers. This segmentation allows each region to be optimized independently, reducing overall area while maintaining functionality.
Data Source
AI summary
A volatile memory device having a reduced area may include; a row decoder extending in a first direction, a column decoder extending in a second direction, a cell region between the row decoder and the column decoder and including a first sense amplifier and a first bit line connected to the first sense amplifier, and a first peripheral circuit region spaced apart from the cell region in the first direction and including includes a first complementary bit line connected to the first sense amplifier. The first sense amplifier may be configured to perform a read/write operation in relation to a first memory cell connected to the first bit line using the first complementary bit line.