Memory Slot Pin Layout for DDR Crosstalk Isolation
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Solution Overview
Problem
In DDR memory systems, signal crosstalk between consecutive signal pins in memory slots is significant due to the arrangement of pins and PCB pads, affecting signal integrity and transmission efficiency.
Innovation Solution
A chip slot design with symmetrically disposed metal sheets on opposite inner side walls, featuring bending pins that extend outside the slot and are alternately arranged in opposite directions between adjacent terminal groups, increasing spacing and reducing electrical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If signal pins and ground pins are arranged in a staggering manner in the memory module, then anti-crosstalk effect is good, but in the memory slot terminal preparation process, consecutive signal pins are arranged together resulting in large signal crosstalk
Solution Approach 1:
The patent applies asymmetry by making bending pins of metal sheets in adjacent terminal groups extend in opposite directions (e.g., left vs. right). This asymmetric arrangement increases the spacing between bending pins of consecutive signal pins, reducing electromagnetic coupling and signal crosstalk while maintaining a relatively simple terminal group structure.
2Ease of manufacture
If bending pins of metal sheets in adjacent terminal groups extend in the same direction, then terminal structure is simple, but spacing between bending pins is small resulting in poor electrical isolation
Solution Approach 1:
The patent makes bending pins of metal sheets in adjacent terminal groups extend in opposite directions rather than the same direction. This asymmetric configuration increases the spacing between bending pins, improving electrical isolation and reducing electromagnetic interference while maintaining manufacturing feasibility.
3Quantity of substance
If spacing between bending pins is small, then terminal group density is high, but electrical isolation between bending pins is poor resulting in signal crosstalk
Solution Approach 1:
The patent resolves this contradiction by making bending pins of adjacent terminal groups extend in opposite directions. This asymmetric arrangement effectively doubles the spacing between bending pins of consecutive signal pins compared to same-direction arrangement, significantly reducing signal crosstalk while maintaining high terminal group density through optimized space utilization.
Data Source
AI summary
A chip slot is disclosed, which includes a slot, where a plurality of terminal groups are disposed in the slot, terminals in each terminal group include metal sheets that are symmetrically disposed on two opposite inner side walls of the slot, and each metal sheet has a bending pin that extends outside the slot; bending directions of bending pins on the terminals in each terminal group are same; and for any row of metal sheets in any two adjacent terminal groups, along an arrangement direction of the row of metal sheets, bending pins of the metal sheets in the adjacent terminal groups are alternately arranged on both sides of the row of metal sheets. The bending pins of the row of metal sheets are bent toward two different directions.