Dielectric Block Interconnect Layout for Low-Capacitance Signal Isolation
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Solution Overview
Problem
Existing semiconductor devices face challenges in achieving high-frequency signal transmission due to parasitic capacitance and electromagnetic interference, which limits their switching speeds and increases electronic crosstalk.
Innovation Solution
The interconnect structure incorporates a low-k dielectric block with conductors partially on the sidewalls of vias, and plugs in remaining vias to prevent solder wicking, along with a shielding element to enhance isolation and reduce electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional interconnect structures are used, then manufacturing is simpler, but parasitic capacitance increases and switching speed decreases
Solution Approach 1:
The interconnect structure is segmented into multiple functional components: conductive elements, dielectric blocks with specific k-values, shielding elements, and plug structures. Each segment serves a specific function in reducing parasitic capacitance or electromagnetic interference, thereby enabling faster switching speeds while maintaining manageable complexity through modular design.
Solution Approach 2:
Different regions of the interconnect structure are assigned different dielectric properties (k=3.0, k=2.5, k=2.0 blocks) and shielding configurations based on local requirements. High-frequency signal paths receive enhanced shielding and lower-k dielectric materials, while other areas use standard configurations, optimizing switching speed where needed without unnecessarily complicating the entire structure.
2Object-generated harmful factors
If shielding elements are added to reduce electromagnetic interference, then crosstalk decreases, but device complexity increases
Solution Approach 1:
Shielding elements are introduced as intermediary structures between conductive elements to block electromagnetic interference. These shielding elements act as mediators that prevent direct electromagnetic coupling between adjacent interconnects, reducing crosstalk while maintaining a systematic and manufacturable structure through standardized shielding configurations.
Solution Approach 2:
The interconnect structure employs composite material systems combining conductive materials, dielectric materials with varying k-values, and shielding materials. This composite approach reduces electromagnetic interference and crosstalk by leveraging the complementary properties of different materials, while the composite structure is designed to be compatible with existing manufacturing processes.
3Object-affected harmful factors
If dielectric blocks with different k-values are used, then parasitic capacitance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The dielectric constant (k-value) is varied across different dielectric blocks (k=3.0, k=2.5, k=2.0) to optimize parasitic capacitance reduction. Each k-value is selected to provide progressively better capacitance reduction while remaining achievable with existing manufacturing capabilities. The parameter change approach allows systematic optimization of electrical performance within manufacturing constraints.
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 parasitic capacitance, enables faster switching speeds, and minimizes electronic crosstalk, while maintaining compatibility with existing semiconductor device design rules and manufacturing processes.
Implementation Method 1
This configuration reduces parasitic capacitance, enables faster switching speeds
Implementation Method 2
along with a shielding element to enhance isolation and reduce electromagnetic interference
Data Source
AI summary
An interconnect structure includes a dielectric block, a first conductive plug, a second conductive plug, a substrate, a first conductive line, and a second conductive line. The first conductive plug and the second conductive plug are surrounded by the dielectric block. The substrate surrounds the dielectric block. The first conductive line is connected to the first conductive plug and is in contact with a top surface of the dielectric block. The second conductive line is connected to the second conductive plug.