Differential Port Phase Offset for EMI Reduction
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Solution Overview
Problem
Multi-port network devices face challenges in reducing electromagnetic interference (EMI) due to increased system power, number of ports, and operating frequency, with existing solutions like shielding and absorption being costly and difficult to implement effectively.
Innovation Solution
The implementation of differential ports, where adjacent optical module ports are configured to operate at different phases, either by adjusting trace lengths or electrical parameters, to reduce electromagnetic interference without significant cost increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding and absorption methods are used to reduce EMI, then EMI reduction is achieved, but cost and implementation difficulty increase
Solution Approach 1:
The patent changes the electrical parameters of the transmission lines by adjusting trace lengths to create phase differences between adjacent ports. This parameter modification causes EMI signals to destructively interfere, reducing overall EMI without requiring additional shielding materials or complex absorption structures, thereby maintaining ease of manufacture while achieving EMI reduction
2Object-affected harmful factors
If shielding and absorption methods are used to reduce EMI, then EMI reduction is achieved, but cost increases
Solution Approach 1:
The invention modifies existing transmission line parameters (trace lengths) to achieve phase-based EMI cancellation. This approach eliminates the need for expensive shielding materials, absorption components, or additional hardware, reducing cost while maintaining effective EMI reduction through intelligent signal phase management
3Productivity
If more ports are added to increase system capability, then system performance improves, but EMI increases
Solution Approach 1:
The patent applies different trace length configurations to adjacent ports, creating local phase differences that cause EMI signals from multiple ports to destructively interfere. This localized parameter variation at each port allows the system to accommodate more ports and increase overall capability while the phase-based cancellation mechanism continuously reduces the cumulative EMI generated by the increased port count
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 approach effectively reduces EMI by approximately 1-6 dB across various frequencies and port configurations, improving electromagnetic compatibility without additional design or manufacturing costs.
Implementation Method 1
Communication of signals from the physical layer device to the optical module ports is configured such that the signals received at the optical module ports adjacent to one another are at different phases to reduce electromagnetic interference associated with the optical module ports
Data Source
AI summary
In one embodiment, an apparatus includes a plurality of optical module ports in communication with a physical layer device in a network device. Communication of signals from the physical layer device to the optical module ports is configured such that the signals received at the optical module ports adjacent to one another are at different phases to reduce electromagnetic interference associated with the optical module ports.