Source/Drain Isolation Structure for Reduced MD Segment Use
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Solution Overview
Problem
The miniaturization of integrated circuits (ICs) has led to increased complexity in design and manufacturing, where existing technologies struggle to efficiently reduce the use of metal segments in electrical paths, resulting in higher costs and area usage, particularly in flip-flop circuits.
Innovation Solution
Incorporating an isolation structure between the active area and metal segments, allowing for the creation of electrical paths separate from the active area, thereby reducing the need for metal segments and minimizing their usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal segments are used for electrical connectivity in ICs, then electrical paths can be established, but cost and area usage increase
Solution Approach 1:
The patent extracts the electrical connectivity function from metal segments by introducing isolation structures that enable alternative current paths through doped semiconductor regions. The isolation structure with opposite polarity doping creates a conductive path that replaces the need for metal segments, thereby reducing area usage while maintaining electrical connectivity.
Solution Approach 2:
The isolation structure acts as an intermediary element between active areas of opposite polarities. By doped with opposite polarity, it creates a conductive bridge that enables electrical connectivity without requiring metal segments, thus serving as a mediator that eliminates the harmful effect of metal segment usage.
2Reliability
If metal segments are used for electrical paths, then connectivity is achieved, but manufacturing cost increases
Solution Approach 1:
The patent removes the expensive metal segment component by extracting its electrical connectivity function and implementing it through doped semiconductor isolation structures. This substitution eliminates the need for additional metal deposition and patterning steps, reducing manufacturing complexity and cost.
Solution Approach 2:
The isolation structure, formed using standard doping processes already present in CMOS fabrication, serves as a low-cost alternative to metal segments. The doping process is aĉç, low-cost technique that can be integrated into existing manufacturing flows without adding significant expense.
3Area of stationary object
If isolation structures are introduced to reduce metal usage, then area and cost are reduced, but device complexity increases
Solution Approach 1:
The isolation structure serves multiple functions simultaneously: it provides electrical isolation between adjacent transistors, creates electrical connectivity between active areas of opposite polarities, and eliminates the need for metal segments. This multi-functionality reduces overall device complexity by consolidating multiple roles into a single structure.
Solution Approach 2:
The patent merges the isolation function with the electrical connectivity function into a single isolation structure. By combining these two functions that were previously performed by separate elements (isolation oxides and metal segments), the overall device complexity is reduced while achieving the same technical effects.
Data Source
AI summary
An integrated circuit (IC) structure includes first and second active areas extending in a first direction in a semiconductor substrate, first and second gate structures extending in a second direction perpendicular to the first direction, wherein each of the first and second gate structures overlies each of the first and second active areas, a first metal-like defined (MD) segment extending in the second direction between the first and second gate structures and overlying each of the first and second active areas, and an isolation structure positioned between the first MD segment and the first active area. The first MD segment is electrically connected to the second active area and electrically isolated from a portion of the first active area between the first and second gate structures.