Semiconductor Fill Cells Without Cut Patterns for Layout Uniformity
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Solution Overview
Problem
As semiconductor technology scales, the process window shrinks, making it increasingly challenging to manufacture semiconductor devices due to stricter process limitations, particularly in maintaining the uniformity and completeness of integrated circuit layouts with the placement and routing of function cells and fill cells.
Innovation Solution
The use of fill cells without cut patterns is introduced to fill empty regions between function cells, ensuring that the semiconductor device layout adheres to process limitation rules and maintains structural uniformity by matching gate widths and threshold voltages with adjacent function cells, thus avoiding violations of process limitations and satisfying placing and routing requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If technology scaling is pursued to improve device performance, then device functionality is enhanced, but process window shrinks making manufacturing more difficult
Solution Approach 1:
Empty regions are introduced as intermediary elements between function cells to serve as buffer zones that maintain process compliance. These empty regions act as mediators that allow the layout to satisfy manufacturing process requirements while accommodating scaled device designs, thereby resolving the contradiction between device performance and manufacturing precision.
2Productivity
If function cells are densely packed to improve area utilization, then productivity increases, but process limitation rules are violated
Solution Approach 1:
The layout is segmented into function cells and empty regions, where empty regions are specifically allocated to satisfy process limitation rules. This segmentation allows dense packing of function cells for high productivity while ensuring that process compliance requirements are met through the intervening empty spaces.
Solution Approach 2:
Empty regions serve as intermediary elements that are strategically placed between function cells to maintain compliance with process limitation rules. These intermediaries enable dense function cell arrangement without violating manufacturing constraints, thus resolving the contradiction between productivity and reliability.
3Device complexity
If empty regions are left unfilled to maintain layout simplicity, then device complexity is reduced, but process limitation rules are violated
Solution Approach 1:
Empty regions are used as simple intermediary elements that maintain layout simplicity while ensuring process limitation compliance. Rather than introducing complex fill patterns or modifying function cells, the patent uses straightforward empty region allocation to satisfy manufacturing rules, thus resolving the contradiction between device complexity and reliability.
4Reliability
If fill cells with cut patterns are used to fill empty regions, then process limitation compliance is improved, but layout uniformity deteriorates
Solution Approach 1:
The cut pattern element is extracted from the fill cell design. Instead of using fill cells with cut patterns that would disrupt layout uniformity, the patent takes out the cut pattern requirement and satisfies process limitation compliance through empty regions, thereby maintaining layout uniformity while ensuring reliability.
Solution Approach 2:
The layout maintains homogeneity by using empty regions rather than fill cells with cut patterns. This approach ensures that all regions of the layout have uniform characteristics without the disruptions caused by cut patterns, thus resolving the contradiction between process limitation compliance and layout uniformity.
Data Source
AI summary
A layout method is disclosed that includes: placing function cells in a layout, corresponding to at least one design file, of an integrated circuit; and inserting at least one fill cell that is configured without cut pattern to fill at least one empty region between the function cells each comprising at least one cut pattern on at least one edge abutting the at least one empty region.