Multi-Junction Fuse Element for Memory Integration
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Solution Overview
Problem
There is a demand for electronic devices with reduced area and improved integration in memory circuits, particularly in semiconductor memory systems, which require efficient fault tolerance and high reliability, but existing technologies face challenges in achieving these goals.
Innovation Solution
The implementation of a fuse element with three or more junctions, where a dielectric breakdown is independently performed between the gate and each junction, allowing for a polygonal shape gate that overlaps the active region and includes switches for selective coupling and decoupling of memory cells and spare cells, enabling efficient fault tolerance and area reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional fuse structure with two junctions is used, then the structure is simple and easy to manufacture, but the area cannot be reduced and integration cannot be improved
Solution Approach 1:
The fuse structure is segmented into multiple independent breakdown regions by introducing three or more junction regions (first, second, and third junction regions) instead of conventional two junctions. Each junction region can undergo dielectric breakdown independently, allowing selective connection of spare memory cells to replace failed cells. This segmentation enables the fuse to control multiple memory cell connections while maintaining a compact area.
Solution Approach 2:
The fuse structure with three or more junction regions serves multiple functions: it can selectively connect different spare memory cells to replace failed cells, provide redundant protection paths, and enable versatile fault tolerance configurations. The gate electrode can independently control dielectric breakdown at different junction regions, allowing a single fuse structure to perform what would traditionally require multiple separate fuse structures.
2Reliability
If multiple separate fuse structures are used to provide fault tolerance for multiple memory cells, then reliability is improved, but the area increases and integration is reduced
Solution Approach 1:
Multiple fuse functions are merged into a single integrated fuse structure with three or more junction regions. The gate electrode and dielectric layer form a unified structure that can independently control dielectric breakdown at multiple junction regions, replacing what would traditionally require multiple separate fuse structures. This merging reduces the total area while maintaining comprehensive fault tolerance coverage for multiple memory cells.
Solution Approach 2:
The single fuse structure with multiple junction regions provides universal fault tolerance capability, where the gate can selectively induce dielectric breakdown at any combination of junction regions to connect appropriate spare memory cells. This multi-functional design allows one fuse structure to perform the fault tolerance function that would traditionally require multiple separate fuse structures, thereby reducing area while improving or maintaining reliability.
3Adaptability or versatility
If the gate is made to laterally protrude out of the active region, then the coupling capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The gate electrode is designed to laterally protrude out of the active region boundary in plan view, extending into the dielectric layer above the active region. This dimensional extension allows the gate to electrically couple with multiple junction regions that are spatially distributed within the active region, enhancing the coupling capability and enabling selective dielectric breakdown at different junctions while maintaining manufacturability through standard semiconductor fabrication techniques.
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 solution allows for reduced area and improved integration in semiconductor memory systems by enabling efficient fault tolerance and selective coupling of memory cells, enhancing the reliability and performance of memory circuits.
Implementation Method 1
a dielectric breakdown between the gate and each of the first to Nth junction regions is independently performed
Data Source
AI summary
A fuse element includes a gate; first to Nth junction regions disposed in an active region, where N is a natural number of 3 or more; and a dielectric layer interposed between the gate and the first to Nth junction regions, wherein a dielectric breakdown between the gate and each of the first to Nth junction regions is independently performed.