Backside Power Switch Layout for IC Routing and EMI Reduction
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Solution Overview
Problem
Existing integrated circuit (IC) packages face challenges with power switches (PWS) being on the front side, which consumes chip area and limits routing resources, leading to inefficient power delivery and increased electromagnetic interference.
Innovation Solution
Implementing power switches and power delivery networks on the backside of the semiconductor substrate, allowing for independent fabrication from front-side logic circuitry, optimizing switching efficiency and freeing up front-side area for other circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power switches are placed on the front side of the semiconductor substrate, then routing control is simplified, but chip area is consumed and routing resources are limited
Solution Approach 1:
The patent moves the power delivery network from the front side (two-dimensional plane) to the back side of the semiconductor substrate, utilizing the third dimension (depth/thickness) of the substrate. This spatial relocation allows power switches to be positioned on the opposite face, freeing up front-side area for logic circuitry while maintaining routing control through vertical interconnect structures.
Solution Approach 2:
The patent divides the semiconductor substrate into functionally separate regions: the front side houses logic circuitry while the back side houses the power delivery network including power switches. This segmentation allows each side to be independently optimized and fabricated, with interconnect structures (such as through-silicon vias) providing the necessary electrical coupling between the segmented regions.
2Device complexity
If power switches are placed on the front side, then integration is simpler, but electromagnetic interference increases
Solution Approach 1:
By relocating the power delivery network to the back side of the substrate, the patent creates physical separation between high-current power switches and sensitive logic circuitry on the front side. This spatial isolation in the vertical dimension reduces electromagnetic coupling and interference while maintaining integration through controlled interconnect structures.
Solution Approach 2:
The patent extracts the power delivery network components (power switches, power rails) from the front side and places them on the back side. This extraction removes the source of electromagnetic interference from proximity to sensitive logic circuits, thereby reducing harmful electromagnetic effects while maintaining functional integration.
3Ease of manufacture
If power switches are placed on the front side, then fabrication is more straightforward, but manufacturing flexibility is reduced
Solution Approach 1:
The patent segments the fabrication process into independent front-side and back-side processing stages. This allows each side to be fabricated separately with optimized process parameters, and the segments are subsequently integrated through interconnect formation. This segmentation enhances manufacturing flexibility by enabling independent process optimization and defect isolation.
Solution Approach 2:
By utilizing the back side of the substrate for power delivery, the patent enables independent fabrication processes on each face. This dimensional approach allows manufacturers to apply different process technologies and parameters to the front and back sides, thereby increasing manufacturing flexibility and adaptability to different design requirements.
Data Source
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AI summary
Semiconductor dies having backside power switch components and related methods are disclosed herein. An example semiconductor die includes a semiconductor substrate defining a front side and a backside. A signal network is provided on the front side. The signal network includes a plurality of first transistors. A power delivery network is provided on the backside. The power delivery network includes a power switch provided on the backside. The power switch includes a plurality of second transistors. The power switch is to cause operation of the first transistors to switch between a first operating state and a second operating state.