Differential Connector Layout for Common Mode Noise Suppression
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Solution Overview
Problem
Existing connectors face challenges in simultaneously addressing common mode noise and impedance matching, as they either increase common mode impedance at the cost of decreasing differential impedance or vice versa.
Innovation Solution
A connector design featuring a pair of terminals with a low-dielectric constant portion interposed between coupling portions, which reduces differential signal skew and increases common mode impedance, while maintaining impedance matching by adjusting the spacing between coupling and connecting portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the outer terminal and inner terminal are brought close to each other to increase common mode impedance, then common mode noise propagation is suppressed, but differential impedance decreases
Solution Approach 1:
The patent applies local quality by introducing a low-dielectric constant portion only at the coupling portion between terminals, while other portions maintain the original dielectric material. This localized modification increases common mode impedance at the coupling region without significantly affecting the overall differential impedance, thus suppressing common mode noise while maintaining signal transmission quality.
Solution Approach 2:
The patent changes the dielectric constant parameter locally at the coupling portion by introducing a low-dielectric constant portion. This parameter change increases the common mode impedance at the coupling region, effectively suppressing common mode noise propagation, while the overall differential impedance remains within acceptable ranges due to the localized nature of the modification.
2Loss of time
If the spacing between coupling portions is reduced to reduce differential signal skew, then signal transmission timing is improved, but common mode impedance decreases
Solution Approach 1:
The patent applies local quality by placing a low-dielectric constant portion specifically at the coupling portion where terminals are spaced apart. This localized modification compensates for the increased electrical path length caused by larger spacing, maintaining signal timing while simultaneously increasing common mode impedance to suppress noise at the coupling region.
Solution Approach 2:
The low-dielectric constant portion acts as an intermediary element between the coupling portions of terminals. It mediates the electrical interaction by providing a controlled impedance environment that reduces signal skew while also increasing common mode impedance, thus addressing both timing and noise concerns simultaneously.
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
The connector effectively suppresses common mode noise propagation and achieves impedance matching by optimizing the dielectric constant and spacing configurations, enhancing signal transmission quality.
Implementation Method 1
a low-dielectric constant portion having a relative dielectric constant set to be lower than that of the dielectric portion is interposed between a coupling portion of the one of the terminals and a coupling portion of the other of the terminals
Implementation Method 2
it is possible to increase a common mode impedance at the coupling portions of the pair of terminals as compared with a configuration in which the interval between the coupling portion of the one of the terminals and the coupling portion of the other of the terminals is set outside the above range
Data Source
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AI summary
A board connector includes a pair of inner terminals. The board connector includes a terminal body. Further, the board connector includes a low-dielectric constant portion having a relative dielectric constant set to be lower than that of the terminal body and interposed between the intermediate extending portion of one of the inner terminals and the intermediate extending portion of the other one of the inner terminals. An spacing between the intermediate extending portion of the one inner terminal and the intermediate extending portion of the other inner terminal is set to be smaller than at least one of an spacing between the fitting-side extending portion of the one inner terminal and the fitting-side extending portion of the other inner terminal or an spacing between the board-side extending portion of the one inner terminal and the board-side extending portion of the other inner terminal.