Stand-Alone Feed-Through Via Layout for Lower RC Delay in IC Routing
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Solution Overview
Problem
Existing integrated circuit (IC) devices face challenges in reducing signal delays due to resistance-capacitance (RC) delays, particularly in the routing connections on the front- and back-sides of the substrate.
Innovation Solution
The implementation of stand-alone feed-through vias (FTVs) that electrically connect features on the front and back sides of the substrate, reducing the need for additional metal layers in the front-side routing and optimizing the layout to overlap with functional circuit cells, thereby minimizing RC delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If embedded FTVs are used in functional circuit cells, then routing connections can be made on the front side, but front-side routing resistance increases due to additional metal layers required
Solution Approach 1:
The patent extracts the FTV function from the functional circuit cells, creating separate stand-alone FTV cells. This separation eliminates the need for additional front-side metal layers, reducing routing resistance while maintaining manufacturing ease through standardized cell structures.
Solution Approach 2:
The patent moves FTV connections from the front side to the back side of the substrate, changing the spatial dimension of routing. Back-side routing through stand-alone FTV cells reduces front-side routing complexity and resistance without compromising signal quality.
2Reliability
If stand-alone FTV cells are used with back-side routing, then front-side routing resistance is reduced, but routing connection complexity increases
Solution Approach 1:
The patent segments the circuit into functional circuit cells and stand-alone FTV cells, allowing independent optimization of each. This segmentation simplifies the overall routing structure by separating signal generation from signal transmission through the substrate.
Solution Approach 2:
The stand-alone FTV cells serve as universal connection points for multiple functional circuits. Each FTV cell can connect to multiple front-side cells, reducing the need for dedicated routing structures and simplifying the overall connection architecture.
3Ease of manufacture
If additional metal layers are added on the front side for embedded FTVs, then routing connections are enabled, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the FTV function from front-side metal layers and implements it through separate stand-alone cells on the back side. This eliminates the need for additional front-side metal layers, reducing manufacturing complexity while maintaining routing connectivity.
Data Source
AI summary
A semiconductor device includes a circuit having a first pin; a first conductor extending in a first direction, the first circuit being between a second conductor and a first side of the first conductor; a circuit having a second pin; and a connection to couple a signal between the first pin and the second pin, the connection including: a first conductive element extending in a second direction, the first conductive element connected to the first pin on the first side of the first conductor; a first via structure connecting the first conductive element to a back of the substrate, including a first feed-through via (FTV) on a second side of the first conductor; a second via structure to provide the signal to a front of the substrate, the second via structure including a second FTV; and a second conductive element connected to the second via structure and the second pin.