MRAM Layout Pattern Reducing Chip Area and Power
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Solution Overview
Problem
Current magnetoresistive random access memory (MRAM) devices face issues such as high chip area, high cost, high power consumption, and sensitivity to temperature variations, limiting their performance and efficiency.
Innovation Solution
A layout pattern for MRAM devices is designed with specific diffusion regions, gate patterns, and contact plugs on a semiconductor substrate, optimizing the arrangement to reduce cell size and improve process window, incorporating shallow trench isolation and metal interconnections with MTJs to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional MRAM layout is used, then data storage function is achieved, but chip area is large
Solution Approach 1:
The patent transitions from a planar two-dimensional layout to a three-dimensional vertical structure by stacking diffusion regions, gate patterns, and contact plugs in multiple layers. This vertical stacking enables multiple memory cells to share common structures, significantly reducing the chip area while maintaining full data storage functionality through the third dimension.
Solution Approach 2:
The patent implements nested structures where smaller components are positioned within or between larger structures. Specifically, contact plugs are positioned within or between stacked diffusion regions and gate patterns, allowing multiple functional elements to occupy overlapping or interleaved spatial positions, thereby maximizing space utilization and reducing overall chip area.
2Use of energy by moving object
If conventional MRAM layout is used, then data storage is achieved, but power consumption is high
Solution Approach 1:
The patent merges multiple memory cell structures by sharing common diffusion regions, gate patterns, and contact plugs between adjacent cells. This consolidation reduces the total number of independent components, thereby decreasing the overall power consumption while maintaining data storage capability through the shared structures that serve multiple functions.
Solution Approach 2:
The stacked diffusion regions and gate patterns serve multiple functions simultaneously - acting as both storage elements and access control structures for different memory cells. This multi-functionality reduces redundant components and lowers power consumption by eliminating the need for separate dedicated structures for each function.
3Reliability
If conventional MRAM layout is used, then basic operation is achieved, but sensitivity to temperature variation is high
Solution Approach 1:
The patent introduces shallow trench isolation structures positioned locally between adjacent diffusion regions and contact plugs. These isolation structures create localized thermal barriers that reduce heat transfer between neighboring components, thereby reducing temperature sensitivity at critical interfaces without requiring a complete redesign of the overall layout structure.
Solution Approach 2:
The shallow trench isolation acts as an intermediary thermal barrier between adjacent active components. This intermediate structure mediates heat transfer by providing thermal insulation, thereby reducing the sensitivity to temperature variations while maintaining the compact stacked architecture.
Data Source
AI summary
A layout pattern of a magnetoresistive random access memory (MRAM) includes a first diffusion region and a second diffusion region extending along a first direction on a substrate, a first contact plug extending along a second direction from the first diffusion region to the second diffusion region on the substrate, a first gate pattern and a second gate pattern extending along the second direction adjacent to one side of the first contact plug, and a third gate pattern and a fourth gate pattern extending along the second direction adjacent to another side of the first contact plug.