Backside Inductor Layout for Higher-Density Semiconductor Dies
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Solution Overview
Problem
Existing semiconductor devices face challenges in efficiently forming power and signal connections to transistors, which can lead to increased size and complexity of the semiconductor dies.
Innovation Solution
The integration of a backside inductor at the backside of a semiconductor substrate, which is electrically connected to the transistors, allowing for inductive coupling of power and signals, thereby reducing the footprint and wiring complexity at the frontend of the die.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional power and signal connections are used at the frontend of the semiconductor die, then reliable electrical connectivity is achieved, but the die footprint and wiring complexity increase
Solution Approach 1:
The patent moves the inductor from the traditional frontend plane to the backend of the semiconductor die, utilizing the third dimension (depth/stacking) to resolve the contradiction. By placing the inductor on the backend and using through-silicon vias (TSVs) for vertical interconnection, the design eliminates the need for large frontend wiring areas while maintaining electrical connectivity. This dimensional transition from 2D planar layout to 3D stacked architecture directly reduces die footprint and simplifies frontend wiring complexity.
2Productivity
If more transistors are integrated to increase device functionality, then device capability improves, but interconnect complexity and space requirements increase
Solution Approach 1:
The patent segments the semiconductor device into distinct functional layers: frontend for transistor circuitry, backend for inductor and passive components, and vertical interconnect layers using TSVs. This segmentation allows high-density transistor integration on the frontend without requiring complex interconnect routing, as connections are established through simplified vertical pathways to the backend. The segmentation enables independent optimization of each layer, thereby increasing transistor density while managing interconnect complexity.
Solution Approach 2:
The invention transitions from planar 2D interconnect routing to 3D vertical interconnection using TSVs. This dimensional change allows signals and power to be routed vertically through the substrate rather than laterally across the die, dramatically reducing the interconnect area required and enabling higher transistor density on the frontend without proportionally increasing interconnect complexity.
3Use of energy by moving object
If inductive coupling is implemented on the backend, then power and signal transmission efficiency improves, but manufacturing process complexity increases
Solution Approach 1:
The patent incorporates the inductor formation into the existing backend processing steps of standard semiconductor manufacturing flows. The inductor is formed using conventional metallization and patterning processes that are already part of the manufacturing sequence, rather than requiring entirely new process equipment or techniques. This preliminary integration of the inductive coupling structure into established manufacturing steps improves power transmission efficiency while minimizing the increase in manufacturing process complexity.
Solution Approach 2:
The patent uses through-silicon vias (TSVs) as intermediary structures to connect the backend inductor to the frontend transistor circuitry. These TSVs serve as mediators that enable the inductive coupling architecture without requiring direct lateral connections, thereby achieving efficient power and signal transmission while utilizing standard vertical via formation processes that add minimal complexity to the manufacturing flow.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient power and signal transmission, reduces the die footprint, and allows for higher transistor densities by simplifying the interconnect layers and improving space utilization.
Implementation Method 1
a backside inductor at a backside of the semiconductor substrate... allowing for inductive coupling of power and signals
Data Source
AI summary
A semiconductor die is disclosed, including circuitry comprising a transistor at a frontside of a semiconductor substrate, and a backside inductor at a backside of the semiconductor substrate. The backside inductor is electrically connected to the transistor of the circuitry.