Filler Cell Insulating Isolation for IC Packing Density
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Solution Overview
Problem
As semiconductor manufacturing processes miniaturize, the integration and performance of integrated circuits face challenges due to the decreasing size of standard cells, which affects the layout and reliability of semiconductor devices.
Innovation Solution
The integration of filler cells with insulating isolations between standard cells enhances the layout integration and performance by separating active regions and improving packing density, using insulating isolations to align gate stacks and dummy gate stacks in specific configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If standard cell size is decreased to improve integration, then packing density improves, but manufacturing precision and reliability deteriorate
Solution Approach 1:
The patent introduces filler cells as intermediary structures between standard cells. These filler cells contain insulating isolations that act as mediators to separate active regions, thereby maintaining manufacturing precision and reliability even as standard cell sizes are reduced to improve packing density.
Solution Approach 2:
The patent segments the standard cell structure by introducing insulating isolations within filler cells that divide and separate active regions. This segmentation allows for better control of electrical characteristics and manufacturing precision in miniaturized devices by creating distinct functional zones within the reduced-size cells.
2Area of stationary object
If standard cell size is decreased to improve integration, then area utilization improves, but electrical separation and reliability worsen
Solution Approach 1:
The filler cells serve as intermediary structures that introduce insulating isolations between adjacent standard cells. These insulating isolations act as electrical mediators that ensure proper separation and prevent interference, thereby maintaining reliability even as cell areas are reduced for better integration.
Solution Approach 2:
The patent applies local quality by placing insulating isolations specifically within filler cells at strategic locations between standard cells. This localized approach ensures electrical separation is provided exactly where needed, maintaining reliability in critical areas while allowing overall cell size reduction for improved area utilization.
3Reliability
If insulating isolations are added to separate active regions, then electrical separation improves, but device complexity increases
Solution Approach 1:
The filler cells serve multiple functions: they provide electrical separation through insulating isolations, maintain structural integrity, and enable proper spacing between standard cells. This multi-functionality allows electrical separation to be achieved without proportionally increasing device complexity, as a single structure accomplishes multiple objectives.
Data Source
AI summary
An integrated circuit includes first and second active regions, first and second standard cells on the first active region and the second active region, and a filler cell between the first and second standard cells and including first and second insulating isolations. The filler cell has a one-pitch dimension. The first and second insulating isolations are spaced the one-pitch dimension apart from each other. The first insulating isolation of the filler cell is disposed at a first boundary between the first standard cell and the filler cell. The second insulating isolation of the filler cell is disposed at a second boundary between the second standard cell and the filler cell. The first and second insulating isolations separate at least a part of the first active region, and at least a part of the second active region.