Semiconductor Cell Routing Layout for Dense Pin Placement
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Solution Overview
Problem
The increasing complexity and miniaturization of semiconductor devices lead to manufacturing challenges such as high yield loss, reduced reliability of electrical interconnections, and low testing coverage, necessitating improvements in device structure and manufacturing methods to reduce device size while minimizing manufacturing costs and processing time.
Innovation Solution
The design of a semiconductor cell structure with specifically arranged conductive segments and power rails, allowing for improved placement and routing of input/output pins, which enhances manufacturing flexibility and density, and adheres to design rules to prevent defects like shorting and routing congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conductive segments are placed closer together to increase density, then manufacturing defects such as shorting and routing congestion increase
Solution Approach 1:
The patent utilizes multiple conductive line layers (first conductive line layer, second conductive line layer) stacked vertically to route conductive segments. By transitioning from a single-plane to a multi-layer three-dimensional arrangement, the design achieves higher density while maintaining adequate spacing within each layer to prevent shorting and routing congestion.
Solution Approach 2:
The patent divides the conductive routing into separate segments across different layers. Conductive segments in the first layer are connected to corresponding segments in the second layer through vertical interconnections, creating a segmented pathway that allows dense packing while maintaining reliability through layered separation.
2Area of stationary object
If device size is reduced to increase functional density, then manufacturing complexity increases
Solution Approach 1:
The patent reduces device footprint by stacking conductive line layers vertically, effectively trading horizontal area for vertical height. This multi-layer approach allows more functional elements to be packed into a smaller planar area while using standardized layer-by-layer fabrication processes to manage manufacturing complexity.
Solution Approach 2:
The patent employs universal conductive line layer structures that can serve multiple routing functions. The same layer architecture and material systems are used for different signal and power routes, allowing the design to scale to smaller sizes using proven, repeatable manufacturing processes rather than requiring new complex techniques.
3Adaptability or versatility
If conductive segments are arranged to improve routing flexibility, then area penalty increases
Solution Approach 1:
The patent achieves routing flexibility by allowing conductive segments to transition between layers through vertical interconnections. This three-dimensional routing capability provides adaptable pathways for connecting input/output pins without requiring excessive horizontal space, as routes can switch layers to avoid obstacles and optimize paths.
Solution Approach 2:
The patent nests conductive segments from different layers in a vertical hierarchy, where segments in the first layer are positioned beneath corresponding segments in the second layer. This nested arrangement allows flexible routing options while minimizing the horizontal area required, as multiple routing paths are packed vertically rather than horizontally.
Data Source
AI summary
A semiconductor cell structure includes: a gate electrode extending in a first direction over a substrate; a first and a second power rails extending in a second direction different from the first direction in a first layer over the substrate, wherein the first power rail and the second power rail are disposed on opposite sides of the cell structure; first conductive segments extending in the second direction between the first and second power rails in the first layer; a third power rail extending in the first direction in a second layer over the first layer; and second conductive segments extending in the first direction in the second layer. At least two of the second conductive segments are aligned with a single track line in the cell structure in the first direction and are separated by a spacing substantially equal to or greater than a minimal segment end spacing.