MRAM Layout Pattern With H-Shape Gates to Cut Chip Area
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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, which affect their performance and efficiency.
Innovation Solution
A novel layout pattern for MRAM that integrates dummy magnetic tunneling junctions (MTJs) and diffusion regions into the word line connecting region, eliminating the need for dummy regions and featuring H-shape gate patterns to optimize space usage and reduce leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional MRAM layout is used with separate dummy regions, then device functionality is maintained, but chip area increases
Solution Approach 1:
The patent merges the dummy MTJ regions with the word line connecting region, eliminating the need for separate dummy regions. The gate pattern extends continuously from the first active region through the word line connecting region to the second active region, integrating the connecting function into the existing layout structure. This reduces chip area while maintaining device functionality through the H-shaped gate configuration that provides proper electrical connections.
Solution Approach 2:
The word line connecting region is designed to serve multiple functions: it connects word lines between active regions, provides a pathway for the gate pattern extension, and accommodates dummy MTJs without requiring separate dedicated spaces. This multi-functional design eliminates the need for additional dummy regions while maintaining all necessary device functions.
2Use of energy by moving object
If conventional MRAM layout is used, then device operation is achieved, but power consumption increases due to leakage
Solution Approach 1:
By merging the dummy MTJ regions with the word line connecting region and extending the gate pattern continuously, the patent eliminates isolated regions that would contribute to leakage currents. The H-shaped gate configuration ensures proper electrical connections while reducing parasitic leakage paths, thereby lowering power consumption without affecting device operation.
3Ease of manufacture
If conventional MRAM layout is used, then basic functionality is provided, but manufacturing complexity increases
Solution Approach 1:
The patent simplifies manufacturing by merging multiple functions into a single continuous gate pattern structure. The H-shaped gate extends from the first active region through the word line connecting region to the second active region, eliminating the need for separate dummy regions and reducing the number of fabrication steps. This integrated approach reduces both layout complexity and manufacturing complexity while maintaining all necessary device functions.
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 design significantly reduces chip area, improves performance, and minimizes the impact of temperature variations, leading to more efficient and cost-effective MRAM devices.
Implementation Method 1
Magnetoresistance (MR) effect has been known as a kind of effect caused by altering the resistance of a material through variation of outside magnetic field. The physical definition of such effect is defined as a variation in resistance obtained by dividing a difference in resistance under no magnetic interference by the original resistance.
Implementation Method 2
a gate pattern extending from the first active region to the second active region, in which the gate pattern includes a H-shape according to a top view
Data Source
AI summary
A layout pattern for magnetoresistive random access memory (MRAM) includes a substrate having a first active region, a second active region, and a word line connecting region between the first active region and the second active region, a first gate pattern extending along a first direction from the first active region to the second active region, a second gate pattern extending along the first direction from the first active region to the second active region, a first magnetic tunneling junction (MTJ) between the first gate pattern and the second pattern and within the word line connecting region, and a second MTJ between the first gate pattern and the second gate pattern in the first active region. Preferably, top surfaces of the first MTJ and the second MTJ are coplanar.