Midboard I/O Connector Alignment for High-Frequency Signal Integrity
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Solution Overview
Problem
Existing electrical connectors face challenges in achieving high signal integrity and density, particularly for high-frequency signals, due to variability in the position of contact portions and pads, leading to increased stub lengths and resonances that interfere with operation at high frequencies.
Innovation Solution
The use of conductive elements with tailored tails for direct attachment to a printed circuit board and cables, combined with a cage and alignment members, reduces variability in the position of contact portions, allowing for precise alignment and shorter stub lengths, thereby improving signal integrity and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrical connectors are used with standard contact positioning, then manufacturing is simpler and cost is lower, but signal integrity deteriorates at high frequencies due to variability in contact position and increased stub lengths
Solution Approach 1:
The patent applies preliminary action by pre-positioning alignment members (such as alignment pins or features) on the connector housing and corresponding alignment features on the circuit board before final assembly. This ensures that contacts are accurately positioned relative to pads during assembly, reducing position variability and stub lengths before the actual connection is made, thereby improving signal integrity at high frequencies
Solution Approach 2:
The patent introduces alignment members as intermediary elements between the connector contacts and circuit board pads. These alignment members act as mediators that establish precise geometric relationships and reduce positioning variability, enabling better signal integrity without requiring extremely tight manufacturing tolerances on the contacts themselves
2Quantity of substance
If contact density is increased to improve signal density, then more signals can be transmitted, but position variability increases leading to longer stub lengths and resonances at high frequencies
Solution Approach 1:
The patent applies segmentation by dividing the connector into modular sections with repeated alignment features in each section. This allows high contact density to be achieved through compact, precisely-aligned modular units rather than a single large array, maintaining position accuracy even as overall signal density increases
Solution Approach 2:
Alignment members are pre-installed in each modular section before contacts are positioned, establishing a precise reference framework that enables high-density contact arrangement while maintaining position accuracy and minimizing stub lengths
3Reliability
If stub lengths are reduced to improve signal integrity at high frequencies, then resonances are minimized, but connector design and manufacturing become more complex
Solution Approach 1:
Alignment members serve as intermediary elements that automatically establish optimal contact-to-pad positioning, thereby minimizing stub lengths without requiring complex manual adjustment or design. The alignment features translate a simple mechanical insertion action into precise positioning, reducing stub lengths while keeping the design relatively simple
Solution Approach 2:
The connector design incorporates self-aligning features where the alignment members and corresponding features automatically position contacts correctly during assembly without external intervention. This self-service mechanism minimizes stub lengths through its own geometric design rather than requiring complex external positioning systems
Data Source
AI summary
An I/O connector assembly configured for making a cabled connection to an interior portion of a printed circuit board for signals passing through the connector. The assembly may include a receptacle connector, a cage and cables, terminated to conductive elements of the terminal subassemblies, extending through the cage to the midboard. The terminal subassemblies may have first type conductive elements configured for mounting to the printed circuit board and second type conductive elements configured for terminating cables. Features may be included for precise positioning of the receptacle connector formed with the terminal subassemblies relative to the cage such that connector to connector variation in the positioning of the contact portions of the conductive elements in the terminal subassembly is provided. A mating plug may be designed with low wipe, which improves high frequency performance of the mated connector system.