Differential Cable Dielectric Layout for Skew and Signal Integrity
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Solution Overview
Problem
Information handling systems face challenges in efficiently communicating data due to manufacturing tolerances that introduce skew, insertion loss, and signal degradation in differential pairs of conductors, particularly in high-volume manufacturing environments.
Innovation Solution
A data communications cable design that incorporates multiple dielectric materials with different relative permittivities, where a higher permittivity material is used closer to the conductors and a lower permittivity material is used outerly, along with a conductive shield and a drain conductor, to minimize electric field intensity near the outer perimeter and compensate for manufacturing imprecisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single dielectric material is used surrounding the differential pair of conductors, then the cable structure is simple, but manufacturing tolerances introduce skew and signal degradation
Solution Approach 1:
The patent applies local quality by using different dielectric materials with different relative permittivities at different locations around the conductors. The first dielectric material with higher relative permittivity is positioned closer to the conductors, while the second dielectric material with lower relative permittivity is positioned outerly. This spatial variation in material properties compensates for manufacturing tolerances and reduces skew, improving signal integrity without requiring precise manufacturing.
2Reliability
If the distance between differential pair of conductors is tightly controlled, then skew is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the electrical parameters of the dielectric materials by selecting materials with different relative permittivities. The inner dielectric material has a higher relative permittivity than the outer dielectric material. This parameter change allows the cable to achieve better skew control through electromagnetic field distribution rather than through tight mechanical tolerances, reducing manufacturing complexity.
3Reliability
If multiple dielectric materials with different relative permittivities are used, then skew and signal degradation are reduced, but the cable structure becomes more complex
Solution Approach 1:
The patent uses composite materials by combining multiple dielectric materials with different relative permittivities in a single cable structure. The first dielectric material (higher permittivity) and second dielectric material (lower permittivity) work together to optimize signal transmission. This composite approach reduces signal degradation and skew while maintaining a relatively integrated cable structure that does not require complex assembly.
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 design reduces skew and signal degradation, maintaining low impedance and capacitance, even when manufacturing tolerances are high, thereby enhancing data communication efficiency and reliability.
Implementation Method 1
a first dielectric material, associated with a first relative permittivity, surrounding the differential pair of conductors; and a second dielectric material, associated with a second relative permittivity, surrounding the first dielectric material
Data Source
AI summary
A data communications cable may communicatively coupled two components associated with an information handling system. For example, the data communications cable may include: a differential pair of conductors; a first dielectric material, associated with a first relative permittivity, surrounding the differential pair of conductors; and a second dielectric material, associated with a second relative permittivity, surrounding the first dielectric material. For instance, the first relative permittivity may be greater than the second relative permittivity, and a distance between the differential pair of conductors may vary plus or minus an amount with a length of the data communications cable.