Continuous Dummy Gate Electrodes for Interconnect Pitch Reduction
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Solution Overview
Problem
The increasing complexity and density of integrated circuits in VLSI technology pose challenges in efficiently interconnecting cells, leading to a need for reduced metal line usage and pitch between adjacent cells, while maintaining signal transmission efficiency.
Innovation Solution
The use of continuous, electrically conductive dummy gate electrodes that span across multiple cells, allowing for signal transmission instead of traditional metal lines, thereby reducing the number of metal lines required and minimizing pitch between cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional metal lines are used to interconnect cells, then signal transmission is achieved, but the amount of metal lines increases and pitch between cells increases
Solution Approach 1:
The gate electrode structure is designed to serve dual functions: as the control electrode for the transistor and as an interconnect for signal transmission between cells. This eliminates the need for separate metal lines for interconnection, directly reducing the quantity of metal lines while maintaining signal transmission capability.
Solution Approach 2:
The patent combines the gate electrode with the interconnect function by making the gate electrode continuous across cell boundaries. This merging of functions allows the same structural element to perform both transistor control and signal routing, thereby reducing the overall amount of metal material needed.
2Quantity of substance
If continuous dummy gate electrodes are used to span across multiple cells, then the amount of metal lines is reduced, but the device complexity increases
Solution Approach 1:
The continuous gate electrode structure is divided into functional segments corresponding to individual transistors, where each segment serves as a gate for its respective transistor. This segmentation allows the continuous structure to be manufactured using standard patterning processes while maintaining the simplicity of the overall design.
3Productivity
If the pitch between adjacent cells is minimized, then circuit density is improved, but manufacturing precision requirements increase
Solution Approach 1:
The continuous gate electrode creates an equipotential structure that extends across cell boundaries, eliminating the need for additional alignment margins between cells. This approach allows cells to be placed closer together without compromising manufacturing yield, as the continuous structure is less sensitive to minor alignment variations.
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 approach effectively reduces the amount of metal lines needed for interconnecting cells, allowing for more compact and efficient integrated circuit designs while maintaining signal integrity.
Implementation Method 1
The use of continuous, electrically conductive dummy gate electrodes that span across multiple cells, allowing for signal transmission
Data Source
AI summary
A layout includes a plurality of cells and at least one dummy gate electrode continuously extends across the cells. Since the dummy gate electrode is electrically conductive, the dummy gate electrode can be utilized for interconnecting the cells. That is, some signals may travel through the dummy gate electrode rather than through a metal one line or a metal two line. Therefore, an amount of metal one lines and/or metal two lines for interconnecting the cells can be reduced.