Ethernet Transmitter Filter for EMI Reduction
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Solution Overview
Problem
Existing Ethernet systems face challenges in reducing Electro-Magnetic Interference (EMI) in EMI-sensitive areas like medical and automotive fields without compromising compatibility with existing devices and systems.
Innovation Solution
An Ethernet-compatible device with a filter is introduced to adjust signal output for EMI reduction, utilizing a combination of internal and external cables or a programmable filter to mimic the attenuation characteristics of longer cables, ensuring compatibility and effective EMI mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmit coding schemes are changed to reduce EMI, then EMI performance is improved, but compatibility with existing devices deteriorates
Solution Approach 1:
A filter is introduced as an intermediary component between the transmitter and the cable. This filter mimics the attenuation characteristics of long cables, allowing EMI reduction without changing the transmit coding scheme or existing devices. The filter acts as a mediator that enables EMI-sensitive areas to be accessed while maintaining backward compatibility.
Solution Approach 2:
Instead of changing the coding scheme, the invention changes the physical parameter of signal attenuation by introducing a filter with specific attenuation characteristics. This allows the system to achieve EMI reduction through parameter modification (adding a filter component) rather than changing the fundamental communication protocol.
2Object-affected harmful factors
If cable length is extended beyond 100 meters, then EMI reduction is improved, but signal attenuation increases
Solution Approach 1:
The filter copies the attenuation characteristics of a long cable (100+ meters) without actually extending the physical cable length. By replicating the frequency-dependent attenuation behavior of long cables through the filter's transfer function, the system achieves EMI reduction while avoiding the full signal loss that would occur with actual cable extension.
Solution Approach 2:
The EMI reduction function is segmented from the physical cable length. Instead of requiring the entire cable to be long to reduce EMI, the invention separates the EMI reduction function into a standalone filter component that can be inserted at the transmitter end, allowing shorter cables to achieve the same EMI protection.
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 EMI while maintaining compatibility with existing Ethernet systems, enhancing communication reliability and extending cable lengths without requiring changes to existing devices or coding schemes.
Implementation Method 1
A filter is coupled to the first Ethernet compatible device for adjusting attenuation of a signal outputted by the first Ethernet compatible device for EMI reduction
Data Source
AI summary
A device for Electro-Magnetic Interference (EMI) reduction in an Ethernet system has an Ethernet compatible device. The Ethernet compatible device has a filter for adjusting a signal outputted by the Ethernet compatible device for EMI reduction.