Seal Ring Return Path for IC Transmission Lines
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Solution Overview
Problem
Integrated circuit devices require significant chip area for coplanar waveguides due to the need for additional parameters like return lines, which is not efficiently managed by microstrip transmission lines, leading to space constraints and performance limitations.
Innovation Solution
The use of seal rings as a return path for current flowing through the signal line in integrated circuit devices, reducing the required chip area by forming transmission lines with seal rings and signal lines, where the seal rings can be configured to provide a return path and shield the active area from noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coplanar waveguide is used for transmission line, then transmission performance is improved, but chip area required increases significantly
Solution Approach 1:
The patent merges the seal ring structure with the transmission line return path, combining two previously separate functions (sealing and electrical return) into a single integrated structure. This eliminates the need for separate return lines while maintaining transmission performance.
Solution Approach 2:
The seal ring is given multiple functions: it continues to provide sealing protection for the active area while simultaneously serving as the return path for the transmission line. This multi-functionality reduces the overall chip area required.
2Area of stationary object
If microstrip transmission line is used, then chip area is reduced, but transmission performance and tunability are limited
Solution Approach 1:
The patent combines the advantages of both microstrip and coplanar waveguide by using the seal ring as a grounded return path similar to microstrip, while maintaining the tunable parameters of coplanar designs through signal line positioning and geometry optimization.
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 configuration reduces the chip area needed for transmission lines while maintaining performance by utilizing seal rings to act as both a return path and a shield, optimizing the layout and reducing noise interference.
Implementation Method 1
The seal rings and the signal line form a transmission line. The seal rings provides a return path for current flowing through the signal line.
Data Source
AI summary
An integrated circuit device includes a semiconductor body, active components formed over the semiconductor body, one or more seal rings surrounding the active components, and a signal line. One or more of the seal rings are configured to provide the primary return path for current flowing through the signal line.