Package Grounding System With Noise-Mitigation Stitching Connector
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current noise mitigation techniques between analog and digital blocks on a package or die, such as splitting ground planes or adding layers, often result in signal integrity weakness and high inductance, which can compromise the robustness of the ground plane connection and increase return path inductance.
Innovation Solution
The implementation of a noise-mitigation stitching connector that electrically couples a first ground to an analog block and a second, physically separate ground to a digital block, preserving signal integrity by employing local isolation without global package layer isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ground planes are split or additional layers are added to mitigate noise between analog and digital blocks, then noise coupling is reduced, but signal integrity weakens and inductance increases
Solution Approach 1:
The ground plane is segmented into separate analog ground and digital ground regions that are physically distinct but electrically connected through controlled impedance paths. This segmentation allows noise isolation while maintaining signal integrity by providing dedicated return paths for each signal type without requiring global layer isolation.
Solution Approach 2:
Different ground connection strategies are applied to different regions of the package. Analog blocks connect to analog ground through low-inductance paths, while digital blocks connect to digital ground through controlled impedance paths. The stitching connector provides localized noise mitigation at critical interfaces without affecting the overall signal integrity of the package.
2Object-affected harmful factors
If ground planes are split or additional layers are added to mitigate noise between analog and digital blocks, then noise coupling is reduced, but inductance increases
Solution Approach 1:
The ground system is segmented into multiple connection points and paths rather than relying on a single ground plane. The stitching connector creates multiple localized ground connections that collectively provide robust noise mitigation without requiring a continuous ground plane, thereby reducing inductance while maintaining connection strength.
Solution Approach 2:
The grounding strategy transitions from a two-dimensional ground plane approach to a three-dimensional stitching connector implementation. The stitching connector provides vertical and lateral ground connections that reduce current loop area and inductance, offering robust ground plane connections without the drawbacks of traditional planar grounding methods.
3Object-affected harmful factors
If global package layer isolation is used to mitigate noise, then noise coupling is reduced, but device complexity increases
Solution Approach 1:
Instead of implementing global package layer isolation, the solution segments the ground connections at specific locations where noise mitigation is most critical. The stitching connector creates localized ground separations that provide noise isolation without requiring complex multi-layer package structures, thereby reducing device complexity while maintaining effectiveness.
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 effectively reduces noise coupling between analog and digital blocks, maintaining signal integrity and reducing transfer impedance and clock jitter, while avoiding the weaknesses of traditional methods.
Implementation Method 1
a noise-mitigation stitching connector that has a first end connected to the first ground and a second end connected to the second ground
Data Source
AI summary
A system including an analog block and a digital block. The analog block and the digital block are arranged on a package. The package includes a first ground coupled to the analog block and a second ground coupled to the digital block. The second ground is physically separate from the first ground. The package also includes a noise-mitigation stitching connector that has a first end connected to the first ground and a second end connected to the second ground.