Absorbing Termination in PCB Interconnects
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Solution Overview
Problem
Conventional resistive terminations for reducing reflected noise signals in printed circuit boards are difficult to implement effectively, as they are time-consuming and costly, and often ineffective in high-speed and high-frequency applications.
Innovation Solution
The use of absorbing materials with a dielectric loss tangent greater than one and a dielectric constant inversely proportional to frequency is employed to create absorbing terminators that can be easily integrated into printed circuit boards, providing effective signal absorption and termination without the need for permanent components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistive termination is used to reduce reflected noise signals, then signal reflection is reduced, but implementation becomes time-consuming and costly
Solution Approach 1:
The patent extracts the termination function from separate resistive components and integrates it directly into the connector structure itself. The connector housing incorporates lossy material that provides termination functionality without requiring external resistors or separate termination components, thereby reducing implementation time and complexity while maintaining signal reflection reduction effectiveness.
Solution Approach 2:
The patent merges the connector structure with the termination function by integrating lossy material directly into the connector housing. This combination eliminates the need for separate resistive termination components and their associated installation steps, resolving the contradiction between achieving signal reflection reduction and minimizing implementation time.
2Reliability
If resistive termination is used to reduce reflected noise signals, then signal reflection is reduced, but cost increases
Solution Approach 1:
The patent combines the connector housing with termination functionality by incorporating lossy material directly into the connector structure. This integration eliminates the need for separate resistive termination components, reducing part counts, assembly steps, and overall manufacturing cost while maintaining effective signal reflection reduction.
Solution Approach 2:
The patent extracts the termination function from expensive separate resistive components and embeds it directly into the connector housing using cost-effective lossy material. This approach reduces manufacturing cost by eliminating additional components and assembly operations while achieving the same signal reflection reduction performance.
3Reliability
If resistive termination is used to reduce reflected noise signals, then signal reflection is reduced, but effectiveness decreases in high-speed and high-frequency applications
Solution Approach 1:
The patent changes the material parameter from conventional resistive material to lossy material with specific electromagnetic properties optimized for high-frequency operation. This parameter change enables effective signal absorption and termination in high-speed and high-frequency applications where traditional resistive termination fails, while maintaining ease of integration into the connector structure.
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 solution offers flexible and robust termination capabilities, particularly in high-speed and high-frequency regions, reducing inter-symbol interference and timing jitter, and is more effective than resistive terminations in broadband and narrowband measurements.
Implementation Method 1
an absorbing material that is disposed to be in direct contact with at least a portion of the connecting component to at least partially absorb a portion of the electrical signal
Data Source
AI summary
Embodiments of the present disclosure are directed toward techniques and configurations for electrical signal absorption in an interconnect disposed in a printed circuit board (PCB) assembly. In one instance, a PCB assembly may comprise a substrate, and an interconnect formed in the substrate to route an electrical signal within the PCB. The interconnect may be coupled with a connecting component that is disposed on a surface of the PCB. An absorbing material may be disposed on the PCB to be in direct contact with at least a portion of the connecting component to at least partially absorb a portion of the electrical signal. Other embodiments may be described and/or claimed.