Differential Noise Suppressor That Absorbs Common-Mode Noise
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Solution Overview
Problem
Conventional common-mode noise suppressors reflect noise, causing interference in high-speed digital transmission systems, especially when connected to peripheral modules like wireless transmitters, leading to radiation interference and signal degradation.
Innovation Solution
A noise suppressor comprising a first and second differential-mode transmission module and a common-mode absorption module, which absorbs common-mode noise from the differential signal, reducing interference by directing the common-mode noise to a reference node, thereby minimizing its impact on the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional reflective common-mode noise filters are used to suppress common-mode noise, then common-mode noise is reflected and suppressed, but the reflected common-mode noise flows to peripheral circuit elements and causes interference
Solution Approach 1:
The patent inverts the conventional approach by using absorption instead of reflection. The common-mode noise filter is designed to absorb common-mode noise energy and convert it to heat through resistive elements, rather than reflecting it back. This inversion of the noise handling mechanism eliminates the harmful reflected noise that interferes with peripheral circuits while maintaining effective common-mode noise suppression.
Solution Approach 2:
The patent converts the harmful common-mode noise energy into beneficial heat energy through resistive dissipation. The filter structure includes resistive elements that transform the electromagnetic energy of common-mode noise into thermal energy, which is then dissipated harmlessly. This conversion process turns the harmful noise into a benign form of energy that no longer causes interference to the system.
2Speed
If differential transmission is used in high speed digital transmission systems, then signal transmission is achieved, but signal energy transitions from differential mode to common mode due to asymmetric structures and via elements
Solution Approach 1:
The patent introduces a common-mode noise filter as an intermediary element between the differential transmission lines and peripheral circuits. This filter acts as a mediator that captures and absorbs the common-mode noise generated during high-speed differential transmission, preventing it from propagating to peripheral circuits. The filter includes common-mode chokes and resistive elements that specifically target and absorb common-mode signals while allowing differential signals to pass through unaffected.
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 absorbs common-mode noise, reducing interference and ensuring the differential signal is transmitted without reflection, thus preventing noise leakage to peripheral circuits, as demonstrated by frequency response diagrams showing significant reduction in common-mode noise transmission and reflection across various frequency bands.
Implementation Method 1
The common-mode absorption module is configured to absorb common-mode noise of the differential signal from at least one of the first differential-mode transmission module or the second differential-mode transmission module
Implementation Method 2
a third terminal that is electrically connected to a reference node
Data Source
AI summary
A noise suppressor includes a first differential-mode transmission module, a second differential-mode transmission module and a common-mode absorption module. The first and second differential-mode transmission modules are configured to receive a differential signal at one of the first and second differential-mode transmission modules, and output the differential signal at the other of the same. The common-mode absorption module is electrically connected to a reference node, and is configured to absorb common-mode noise of the differential signal from at least one of the first differential-mode transmission module or the second differential-mode transmission module.