Multi-PCB Electrical Connector Layout for Crosstalk Compensation
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Solution Overview
Problem
Electrical connectors, particularly RJ45 sockets, face limitations in installation space, restricting the arrangement and design of compensation units to improve NEXT, FEXT, insertion loss, and reflection loss, necessitating additional compensation boards which are insufficient as data rates increase.
Innovation Solution
An electrical connector design featuring three circuit boards electrically connected to contact elements, allowing for strategic compensation unit placement to minimize or eliminate topology-induced crosstalk, optimize insertion loss, and reflection loss, with differential transmission paths and compensation units like inductors and capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single compensation board is used in the electrical connector, then the installation space is saved and the structure is simplified, but the ability to minimize topology-induced crosstalk and optimize transmission characteristics (NEXT, FEXT, insertion loss, reflection loss) is insufficient, especially as data rates increase
Solution Approach 1:
The compensation function is segmented across three separate circuit boards (first, second, and third compensation boards) instead of using a single board. Each board can be independently positioned and designed with specific compensation units, allowing for optimized crosstalk cancellation and transmission characteristic improvement while maintaining manageable structural complexity
Solution Approach 2:
The patent utilizes the third dimension (vertical stacking) by arranging multiple compensation boards at different positions within the connector housing. This spatial arrangement provides additional degrees of freedom for positioning compensation units to optimally cancel crosstalk between adjacent contact elements, transforming a 2D board layout problem into a 3D spatial optimization problem
2Volume of moving object
If the size of the electrical connector is reduced to fit limited installation space, then the connector becomes more compact and easier to install, but the arrangement and design of compensation units is restricted, limiting the ability to improve NEXT, FEXT, insertion loss, and reflection loss
Solution Approach 1:
Multiple compensation boards are nested within the connector housing in a compact stacked arrangement. The first, second, and third compensation boards are positioned at different locations within the limited space, with each board containing compensation units that are precisely arranged to target specific crosstalk paths between contact elements
Solution Approach 2:
Different regions of the connector are assigned different functions with specialized compensation units. Each compensation board targets specific adjacent contact element pairs, with compensation units locally positioned to cancel crosstalk between those specific elements. This localized approach maximizes the effectiveness of each compensation unit within the constrained space
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 design significantly reduces crosstalk, improves transmission characteristics, and enhances insertion and reflection loss performance by providing increased degrees of freedom in board arrangement and compensation unit placement.
Implementation Method 1
The inductance can be implemented as a discrete component or as a meandering structure within a conductor track
Implementation Method 2
The capacitor can be designed as a capacitor, in particular as a plate capacitor or as an interdigital capacitor
Data Source
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AI summary
Electrical connector (1) for a data or communication cable with the following features: - a housing (10), - a first circuit board (20), wherein the first and second contact elements (21, 22) are directly electrically connected to the first circuit board (20), - a second circuit board (30), characterized by the further features: - at least one third circuit board (40), - the first, second and third circuit boards (20, 30, 40) are directly electrically connected to at least one second contact element (22), and - the first, second and third circuit boards (20, 30, 40) are at least partially arranged in the housing.