Non-volatile Memory Cell with Redundant Signal Pathways
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Solution Overview
Problem
Existing non-volatile data storage devices lack redundancy in signal pathways, making them vulnerable to failure when primary access pathways are inoperable, and conventional fabrication methods occupy more real estate due to discrete diffusion layers and additional protective structures.
Innovation Solution
A non-volatile memory cell with multiple redundant signal pathways and a continuous diffusion layer region for efficient connection, utilizing NMOSFETs and antifuse transistors to ensure access to data even if primary pathways fail, and eliminating the need for poly over diffusion edge devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple redundant signal pathways are implemented, then reliability of data access is improved, but device complexity increases
Solution Approach 1:
The memory cell is divided into multiple independent signal pathways (first signal pathway and second signal pathway), each capable of independently accessing the antifuse. This segmentation allows redundancy without requiring a completely separate backup structure, as each pathway is a simplified version of the access route.
Solution Approach 2:
Multiple signal pathways are merged into a single memory cell structure, sharing common elements such as the antifuse and portions of the diffusion layer. This merging reduces the overall complexity compared to having completely separate redundant structures, while still providing multiple access routes.
2Area of stationary object
If continuous diffusion layer region is used, then area occupied by memory cell is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The first and second diffusion layers are merged into a single continuous diffusion layer region that serves both signal pathways. This eliminates the need for separate discrete diffusion layers and their associated protective structures, reducing the overall area while the continuous nature simplifies manufacturing by reducing the number of alignment-critical interfaces.
Solution Approach 2:
The patent extracts and eliminates the poly over diffusion edge protective structures from the design. By removing these additional structures, the manufacturing process is simplified and the area occupied by each memory cell is reduced, while the continuous diffusion layer provides sufficient structural integrity without requiring extra protective layers.
3Ease of manufacture
If discrete diffusion layers with protective structures are used, then manufacturing robustness is improved, but area occupied by memory cell increases
Solution Approach 1:
Multiple discrete diffusion layers and their protective structures are merged into a single continuous diffusion layer region. This consolidation maintains manufacturing robustness by providing a unified structure that is easier to fabricate without the complexity of aligning multiple discrete layers, while simultaneously reducing the total area occupied by the memory cell.
Solution Approach 2:
The patent extracts and removes the poly over diffusion edge protective structures from the memory cell design. This elimination reduces the area occupied by each memory cell while the continuous diffusion layer provides sufficient structural integrity for manufacturing without requiring these additional protective elements.
Data Source
AI summary
A non-volatile memory cell, having an antifuse for storing data, is disclosed for use in a non-volatile data storage device. The non-volatile memory cell includes multiple redundant signal pathways to provide redundant access to the antifuse. During operation, the non-volatile memory cell can access the antifuse using a first signal pathway from among the multiple redundant signal pathways. However, when the first signal pathway is inoperable, the non-volatile memory cell is able to access the antifuse using a second signal pathway from among the multiple redundant signal pathways. The non-volatile memory cell is fabricated using a continuous region of one or more diffusion layers to allow efficient connection to other non-volatile memory cells to form an array of memory cells for the non-volatile data storage device.