Circuit Board Ground Shields for Crosstalk Reduction
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Solution Overview
Problem
In high-performance electronic systems, crosstalk between electrical wires mounted on circuit boards is a significant issue due to interference at the wire mount area, leading to signal path errors.
Innovation Solution
A circuit board with an internal ground plane and mounted ground shields that extend over electrical wires, electrically connecting to the ground plane and providing shielding between adjacent signal conductors to reduce crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical wires are mounted close together on the circuit board to increase density, then the productivity and compactness of the electronic system is improved, but crosstalk between adjacent wires increases causing signal errors
Solution Approach 1:
Ground shields are introduced as intermediary elements between adjacent electrical wires. These shields extend from the top surface through the substrate to the bottom surface of the circuit board, creating physical and electrical separation between signal conductors. The ground shields act as mediators that block electromagnetic coupling between adjacent wires, thereby reducing crosstalk while allowing high wire mounting density.
Solution Approach 2:
The circuit board structure is segmented into distinct regions separated by ground shields. Each signal conductor is effectively isolated in its own segment by the ground shields, preventing interference between segments. This segmentation allows wires to be mounted closely together while maintaining signal integrity through the dividing ground shield structures.
2Reliability
If ground shields are added to reduce crosstalk, then signal integrity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The ground shields are merged with the circuit board substrate structure. The shields extend continuously from the top surface through the substrate to the bottom surface, integrating the shielding function into the board itself rather than adding separate discrete components. This merging reduces assembly steps and simplifies manufacturing while maintaining the crosstalk reduction benefit.
Solution Approach 2:
The ground shields serve multiple functions simultaneously: they provide electromagnetic shielding between adjacent wires, establish reference ground planes for signal conductors, and structurally organize the wire mounting layout. This multi-functionality reduces the need for additional separate components, thereby reducing overall device complexity despite the added shielding capability.
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
The solution effectively minimizes crosstalk between electrical wires terminated on the same side of the circuit board, enhancing signal integrity and reducing errors in high-speed electronic systems.
Implementation Method 1
Ground shields are mounted to the mounting region of the circuit board and include electrically conductive bodies that are configured to extend over corresponding electrical wires along the mounting region of the circuit board. The bodies of the ground shields include side segments that are configured to extend between the signal conductors of adjacent electrical wires
Data Source
AI summary
An electrical connector includes a circuit board having an internal ground plane that defines at least a portion of an internal layer of the circuit board. The circuit board has an exterior side that includes a mounting region and includes electrical contacts arranged on the exterior side within the mounting region for making electrical connection with corresponding signal conductors of electrical wires. Ground shields are mounted to the mounting region of the circuit board and include electrically conductive bodies that are configured to extend over corresponding electrical wires along the mounting region of the circuit board. The bodies of the ground shields include side segments that are configured to extend between the signal conductors of adjacent electrical wires along the mounting region of the circuit board. The bodies are engaged with the internal ground plane of the circuit board to electrically connect the ground shields to the internal ground plane.