Multiwire Differential Circuit Grounding for In-Phase Noise Suppression
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Solution Overview
Problem
Multiwire differential transmission systems face challenges with in-phase noise suppression, as conventional noise suppression technologies are inadequate for systems with three or more transmission lines, leading to signal quality disturbances and electromagnetic interference.
Innovation Solution
An in-phase noise suppression device comprising a signal transmitting unit with multiple signal transmitting circuits and a grounding unit, where the signal transmitting unit forms signal transmitting channels for balanced digital signals, and the grounding unit connects to the signal transmitting unit to suppress in-phase noise by coupling noise to the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiwire differential transmission (>2 lines) is used to increase channel capacity and reduce space occupation, then space efficiency and layout simplicity are improved, but in-phase noise generation and matching complexity increase
Solution Approach 1:
The invention divides the multiwire transmission system into multiple differential pairs, where each pair is independently managed with dedicated reference conductors and grounding circuits. This segmentation allows noise suppression to be applied systematically to each differential pair while maintaining the space efficiency of multiwire transmission.
Solution Approach 2:
The invention introduces reference conductors as intermediary elements between signal transmitting circuits and grounding circuits. These reference conductors serve as mediators to provide stable reference potentials and facilitate noise suppression without directly interfering with the differential signal transmission, thus reducing in-phase noise while maintaining transmission integrity.
2Object-affected harmful factors
If conventional two-line in phase filter is used for noise suppression, then in-phase noise filtering is achieved for single data transmission, but it cannot suppress noise in multiwire differential transmission (>2 lines)
Solution Approach 1:
The invention designs a universal noise suppression structure that can be applied to any number of differential pairs (N≥2). Each differential pair is equipped with its own reference conductor and grounding circuit, creating a scalable universal solution that works for both two-line and multiwire differential transmissions, thus achieving adaptability across different transmission configurations.
Solution Approach 2:
The invention extends the conventional two-line noise suppression approach by adding the dimension of multiple differential pairs sharing a common grounding system. This dimensional extension allows the noise suppression mechanism to scale from single-pair to multi-pair transmissions without fundamentally changing the core suppression principle.
3Reliability
If multiple matching characteristics are considered for N-line transmission (N≥3), then signal quality can be maintained, but design complexity and thresholds increase significantly
Solution Approach 1:
The invention applies local quality by ensuring each differential pair has its own dedicated reference conductor with specific impedance matching characteristics. This allows each pair to be optimized independently for signal quality while the overall system complexity is managed through modular repetition of the same local structure across multiple pairs.
Solution Approach 2:
The invention systematically controls impedance parameters of reference conductors and grounding circuits to achieve proper matching. By carefully designing the impedance values and configurations of reference conductors and grounding paths, the invention achieves signal quality optimization without requiring complex multi-variable optimization across all N lines 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
Effectively transmits multiple digital data signals with good signal quality while suppressing in-phase noise, reducing electromagnetic interference and radiation issues in multiwire differential transmission systems.
Implementation Method 1
The signal transmitting unit and the grounding circuit cooperatively constitute a noise suppression device so as to suppress the in-phase noise generated in the signal transmitting circuits
Data Source
AI summary
An in-phase noise suppression device includes a signal transmitting unit and a grounding unit. The signal transmitting unit includes a number (N) of signal transmitting circuits, where N≥3. Each of the signal transmitting circuits has an input terminal and an output terminal, receives a level signal at the input terminal thereof, and outputs the level signal at the output terminal thereof. The grounding unit includes a grounding circuit that is connected to the signal transmitting unit. The level signals respectively received by the signal transmitting circuits at the input terminals thereof, when being respectively transmitted along the signal transmitting circuits, generate at least two balanced digital signals and in-phase noise. The signal transmitting unit and the grounding circuit cooperatively constitute a noise suppression device so as to suppress the in-phase noise generated in the signal transmitting circuits.