Closed-Loop Connector Pins for Low-Crosstalk PCB Compression Links
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Solution Overview
Problem
The existing connector pins in computer systems, particularly in SODIMM connectors, suffer from significant crosstalk due to their length and lack of effective ground shielding, leading to noise and increased error rates as transfer frequencies increase.
Innovation Solution
The implementation of closed loop connector pins that self-contact when compressed, forming a loop within the pin itself, reduces the electrical length of current paths and improves crosstalk by providing a shorter return path closer to ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional long connector pins are used to connect SODIMM to system board, then electrical connection is achieved, but crosstalk and noise increase significantly
Solution Approach 1:
The connector pin is segmented into multiple sections with different functions: a first section for signal transmission, a second section forming a loop structure, and a third section for return path. This segmentation allows each section to optimize its function, reducing overall crosstalk while maintaining electrical connection reliability.
Solution Approach 2:
The loop structure of the second section is nested within the connector pin body, creating a compact configuration that provides ground shielding without increasing overall connector size. The loop encloses the signal path, providing electromagnetic shielding similar to a nested structure.
2Object-generated harmful factors
If more ground pins are introduced to reduce noise, then shielding improves, but pin count and PCB space increase
Solution Approach 1:
The second section of the connector pin serves multiple functions simultaneously: it provides ground shielding, creates a return current path, and reduces crosstalk. This multi-functionality eliminates the need for separate ground pins, maintaining noise reduction benefits while keeping pin count unchanged.
Solution Approach 2:
The ground shielding function is merged into the connector pin structure itself through the loop formation, rather than requiring separate ground pins. The loop structure combines shielding, return path, and signal transmission functions into a single integrated component.
3Length of stationary object
If connector pins are made longer to reach system board, then connection distance is covered, but susceptibility to noise increases
Solution Approach 1:
Different sections of the connector pin have different structural qualities optimized for their specific functions. The first section maintains standard dimensions for signal transmission, while the second section forms a compact loop providing local ground shielding and short return path, reducing noise susceptibility without compromising connection distance.
4Length of stationary object
If bends are introduced to equalize pin length, then physical length is equalized, but manufacturing complexity increases
Solution Approach 1:
The connector pin employs an asymmetric structure where the second section forms a loop on one side of the pin axis rather than symmetric bends. This asymmetric loop configuration achieves length equalization and ground shielding functions with simpler manufacturing processes compared to traditional symmetric bent designs.
Data Source
AI summary
A connector includes connector pins that have a loop of conductor. The connector connects a first printed circuit board (PCB) to a second PCB with compression of the connector pins between the two boards. In response to compression of the connector, the connector pins make electrical contact with themselves through the loop, while also connecting pads of the first PCB to pads of the second PCB.