Source/Drain Isolation Layout for Lower-Area Flip-Flop Routing
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Solution Overview
Problem
The miniaturization of integrated circuits (ICs) has led to increased complexity in design and manufacturing, with existing technologies struggling 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 reduction or elimination of metal segments by creating separate electrical paths, thereby reducing costs and area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal segments are used to create electrical paths in ICs, then electrical connectivity is achieved, but area usage and cost increase
Solution Approach 1:
The patent divides the electrical path into segmented portions: metal segments for long-distance connections and isolation structures with embedded conductive regions for short-distance connections. This segmentation allows elimination of continuous metal segments in favor of discrete, smaller conductive regions embedded in isolation structures, thereby reducing overall area usage while maintaining connectivity.
Solution Approach 2:
The isolation structure acts as an intermediary between metal segments, providing embedded conductive regions that serve as connection points. This intermediary approach allows electrical paths to be formed through the isolation structure itself rather than requiring additional metal segments, reducing area usage and metal consumption.
2Reliability
If metal segments are used to create electrical paths in ICs, then electrical connectivity is achieved, but cost increases
Solution Approach 1:
The patent merges the isolation structure function with the electrical connection function by embedding conductive regions within the isolation structures. This combination eliminates the need for separate metal segments for certain connections, reducing metal usage and associated costs while maintaining electrical connectivity.
Solution Approach 2:
The patent extracts the electrical connection function from the metal segment layer and relocates it to the isolation structure layer through embedded conductive regions. This extraction reduces dependency on metal segments and their associated manufacturing costs.
3Area of stationary object
If isolation structures are introduced to reduce metal segments, then area usage and cost decrease, but device complexity increases
Solution Approach 1:
The isolation structures are designed to serve multiple functions: electrical isolation between active regions and embedded electrical connection through conductive regions. This multi-functionality reduces the need for separate structures, simplifying the overall device architecture despite the added complexity within individual isolation structures.
Data Source
AI summary
An integrated circuit (IC) structure includes a first transistor including a first gate structure adjacent to first and second portions of a first active area positioned in a semiconductor substrate, a second transistor including a second gate structure adjacent to the second portion of the first active area and a third portion of the first active area, an isolation structure overlying the second portion of the first active area, and first through third metal-like defined (MD) segments overlying the respective first through third portions of the first active area. The first and third MD segments are electrically connected to the respective first and third portions of the first active area, and the second MD segment is electrically isolated from the second portion of the first active area by the isolation structure.