EMI Cancellation via Common-Mode Signal Extraction in Ethernet Transceivers
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Solution Overview
Problem
High-speed Ethernet networks face reliability issues due to insufficient immunity to electromagnetic interference (EMI), which can cause link failures, especially in higher frequency systems where EMI characteristics are unpredictable and difficult to suppress, especially during data transmission.
Innovation Solution
A method and apparatus that extract and process common-mode signals from conductors to reduce EMI by summing them with received signals, using notch filtering or slicer error feedback, enabling effective cancellation of EMI in Ethernet transceivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional EMI protection methods (shielding, differential transmission, analog-front end filtering) are used, then basic EMI immunity is provided, but reliability under unpredictable EMI conditions deteriorates
Solution Approach 1:
The system performs preliminary action by continuously monitoring and detecting EMI characteristics before they cause link failure. The EMI detector proactively identifies interference patterns and enables the canceller to prepare countermeasures in advance, rather than waiting for link failure to occur.
Solution Approach 2:
The system implements feedback by using the detected EMI characteristics to dynamically adjust the cancellation process. The EMI detector provides continuous feedback about interference conditions to the canceller, which adjusts its cancellation strategy in real-time based on this feedback loop.
2Duration of action of moving object
If EMI suppression is attempted during data transmission, then link continuity is maintained, but detection and cancellation speed must increase dramatically
Solution Approach 1:
The system segments the signal processing into distinct functional components: the EMI detector separately identifies interference characteristics, while the canceller separately executes cancellation operations. This segmentation allows each component to specialize and operate independently, improving overall detection and response speed during data transmission.
Solution Approach 2:
The system introduces an intermediary EMI detector that acts as a mediator between the received signal and the cancellation process. This intermediary component analyzes EMI characteristics and provides processed information to the canceller, simplifying the detection task and enabling faster response during active transmission.
3Reliability
If real-time EMI cancellation is implemented, then link reliability improves, but processing complexity increases
Solution Approach 1:
The system extracts EMI characteristics as a separate identifiable component from the overall received signal. By isolating and extracting the EMI portion through dedicated detection, the complex task of cancellation is simplified into a matter of subtracting the extracted interference from the original signal.
Solution Approach 2:
The system changes parameters by using the detected EMI characteristics (frequency, amplitude, phase) to dynamically adjust cancellation parameters. Rather than implementing complex adaptive algorithms, the system simply applies parameter changes based on detected EMI properties, reducing processing complexity while maintaining effectiveness.
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 solution effectively reduces electromagnetic interference in Ethernet systems, ensuring reliable link operation by detecting and canceling EMI characteristics in real-time, even during data transmission, thereby enhancing the stability of high-speed Ethernet networks.
Implementation Method 1
A common-mode signal is extracted from the at least two conductors
Implementation Method 2
The common-mode signal is processed and summed with the received signal, thereby reducing electromagnetic interference of the received signal
Implementation Method 3
Electromagnetic interference of the received signal is reduced using notch filtering, wherein the notch filtering is based at least in part on the processed common-mode signal
Implementation Method 4
Electromagnetic interference of the received signal is reduced using slicer error feedback, wherein the slicer-error feedback filtering is based at least in part on the processed common-mode signal
Data Source
AI summary
Embodiments of methods and apparatus for reducing electromagnetic interference of a received signal are disclosed. One method includes receiving a signal over at least two conductors, extracting a common-mode signal from the at least two conductors, processing the common-mode signal, and reducing electromagnetic interference of the received signal by summing the processed common-mode signal with the received signal.