Package Substrate Dk Region Layout for Mixed Signal Routing
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Solution Overview
Problem
Existing package substrates compromise signal performance due to conflicting routing demands for different segments, as they typically use uniform dielectric materials across layers, failing to optimize signal routing for both single-ended and differential I/O interfaces.
Innovation Solution
Implementing package substrates with distinct dielectric constant (Dk) regions, where single-ended routing traces are surrounded by high Dk materials and differential traces by low Dk materials, optimizing signal routing performance by controlling Dk in specific regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform dielectric material is used across all routing segments, then manufacturing simplicity is maintained, but signal performance is compromised due to conflicting routing demands
Solution Approach 1:
The patent applies local quality by implementing different dielectric materials with different dielectric constants (Dk values) in different regions of the package substrate. Specifically, breakout routing segments use a first dielectric material with a first Dk value, while main routing segments use a second dielectric material with a second Dk value. This allows each routing segment to have optimized signal performance characteristics tailored to its specific requirements, resolving the contradiction between manufacturing simplicity and signal performance.
Solution Approach 2:
The patent segments the package substrate into different routing regions (breakout routing and main routing) with distinct dielectric materials. This segmentation allows independent optimization of dielectric properties for each routing type, enabling the breakout routing to have one Dk value optimized for its signal characteristics while the main routing has another Dk value optimized for its requirements, thereby improving overall signal performance without excessive manufacturing complexity.
2Reliability
If different dielectric materials are used for breakout and main routing segments, then signal performance is optimized, but device complexity increases
Solution Approach 1:
The patent implements local quality by assigning different dielectric materials to specific routing segments (breakout vs. main routing) based on their signal performance requirements. The first dielectric material with first Dk value is used in breakout routing regions, while the second dielectric material with second Dk value is used in main routing regions. This localized differentiation optimizes signal performance for each segment while maintaining a manageable overall structure through systematic material assignment.
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 enhances signal routing by reducing loss and impedance mismatch, enabling higher bandwidth and facilitating future bandwidth scaling for high-speed signaling.
Implementation Method 1
different dielectric constant (Dk) regions within a single dielectric layer... high Dk regions surround single-ended routing traces and low Dk regions surround differential routing traces, optimizing signal routing by controlling Dk values in specific regions to reduce routing loss and impedance mismatch
Data Source
Figure 1
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AI summary
Embodiments include semiconductor packages and methods of forming the semiconductor packages.