Memory Device Isolation Cell Edge Array Layout
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Solution Overview
Problem
In the semiconductor industry, the design of read/write word line segments leads to significant area loss due to necessary blank spaces between memory arrays and logic circuits, resulting in increased product size and manufacturing costs.
Innovation Solution
The use of an isolation cell to separate adjacent memory arrays, with edge cell arrays arranged on the boundaries opposite to the isolation cell, reduces the number of edge cell arrays and blank spaces required, thereby optimizing area efficiency and reducing product size and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If read/write word line segment design is used to separate memory arrays and logic circuits, then isolation and signal integrity are improved, but area loss increases due to necessary blank spaces
Solution Approach 1:
The patent merges the isolation cell functionality with the edge cell array by positioning edge cell arrays at the boundaries opposite to isolation cells. This integration eliminates the need for separate blank spaces between memory arrays and logic circuits, reducing area loss while maintaining signal integrity through the combined isolation and edge structure.
Solution Approach 2:
The edge cell arrays serve dual functions: they act as edge cells for their respective memory arrays while simultaneously providing isolation between adjacent memory arrays. This multi-functionality eliminates the need for dedicated isolation structures and blank spaces, thereby reducing overall chip area while maintaining proper isolation.
2Stability of the object's composition
If multiple edge cell arrays are used to surround memory arrays, then memory array isolation and stability are improved, but the number of edge cell arrays and blank spaces increases, leading to area loss
Solution Approach 1:
The patent combines the isolation function with the edge cell function by positioning edge cell arrays at boundaries opposite to isolation cells. This merging reduces the total number of edge cell arrays needed while maintaining memory array stability through the cooperative isolation-edge structure.
Solution Approach 2:
Instead of placing isolation cells between every adjacent memory array segment, the patent inverts the approach by using edge cell arrays at opposite boundaries to provide isolation. This inverted configuration reduces the number of isolation structures needed while maintaining effective separation.
Data Source
AI summary
A memory device includes a first isolation cell, a first memory array of a first memory segment, a second memory array of a second memory segment, a first decoder cell of the first memory segment and a second decoder cell of the second memory segment. The first isolation cell extends in a first direction. The first memory array of the first memory segment abuts a first boundary of the first isolation cell in a second direction different from the first direction. The second memory array of the second memory segment abuts a second boundary, opposite to the first boundary, of the first isolation cell in the second direction. The first decoder cell of the first memory segment and the second decoder cell of the second memory segment are arranged on opposite sides of the first isolation cell.