Surface Mount Connector Ground Routing for Signal Integrity
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Solution Overview
Problem
The challenge is to achieve high channel density with low manufacturing costs while maintaining signal integrity in microelectronic devices, particularly in scenarios where available PCB real estate is limited and high-speed connections are required, such as in networking chip configurations.
Innovation Solution
A surface mount connector design with a matrix arrangement of signal and ground sites, where signal sites are surrounded by ground sites for electrical shielding, and ground vias are selectively used to maximize PCB real estate for routing, allowing for shorter connections and reduced noise, while using low-cost metallization techniques for trace formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If interconnection density is increased to support more parallel channels, then channel capacity improves, but signal integrity deteriorates due to crowding and interference
Solution Approach 1:
The connector is divided into multiple independent signal sites, each surrounded by its own ground sites. This segmentation isolates each signal channel from others, preventing crosstalk while maintaining high density. Each signal site operates independently with dedicated shielding, resolving the conflict between close spacing and signal integrity.
Solution Approach 2:
Ground sites are introduced as intermediary elements between signal sites. These ground sites act as electromagnetic shields that mediate the interaction between adjacent signal channels, blocking interference while allowing the signal sites to remain closely spaced for high density.
2Reliability
If more ground sites are added to shield signal sites, then signal integrity improves, but manufacturing cost increases due to higher via density
Solution Approach 1:
Ground vias are selectively placed only at critical locations where electromagnetic interference is most severe, rather than uniformly distributing them across all ground sites. This local quality approach provides shielding where needed while reducing overall via count and manufacturing complexity.
Solution Approach 2:
Instead of providing complete ground via coverage for all ground sites, the invention uses partial action by selecting only certain ground sites for via implementation. This partial coverage is sufficient to achieve the required signal integrity while significantly reducing manufacturing cost and complexity.
3Area of stationary object
If PCB area is reduced to save real estate, then device footprint improves, but routing capability deteriorates due to limited space for traces and vias
Solution Approach 1:
The invention merges the functions of ground sites and routing space by using the same PCB real estate for both purposes. The ground sites are positioned such that they provide shielding while simultaneously defining the boundaries of routing regions, eliminating the need for separate dedicated routing corridors.
Solution Approach 2:
The connector utilizes a two-dimensional matrix arrangement of signal and ground sites, efficiently packing connections in both horizontal and vertical dimensions. This dimensional optimization allows high channel density within a minimal footprint while maintaining adequate space for routing through strategic via placement.
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 configuration enhances signal integrity by reducing crosstalk and signal loss, improves noise cancellation, and allows for cost-effective manufacturing by enabling wider traces and relaxed pitch, thus supporting high-speed data transmission at 32Gb/s+ with reduced manufacturing costs.
Implementation Method 1
signal sites substantially surrounded by a number of ground sites
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Electronic devices and associated methods are shown including a connector mounted to a printed circuit board (PCB). Examples shown include a number of ground vias passing through the PCB to a second side of the PCB, wherein the number of ground vias is smaller than a number of ground sites. Selected examples include an optoelectronic connector mounted using surface mount technology.