PCB Stitching Vias for Signal Noise Reduction
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Solution Overview
Problem
Existing methods for reducing electrical signal noise in printed circuit boards, such as those involving ground planes and stitching capacitors, are inadequate in effectively mitigating noise emissions, particularly in vehicle environments where they can disrupt other electrical and electronic devices.
Innovation Solution
The implementation of stitching vias near the periphery of a printed circuit board, alternately connected to differential signal conductive planes, which are energized by a differential electrical signal to reduce noise emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If stitching capacitors are introduced between conductive and ground planes for noise reduction, then electrical signal noise is reduced, but device complexity increases
Solution Approach 1:
The patent extracts the noise reduction function from complex stitching capacitor arrangements and implements it through a simpler via structure. The via is configured to couple between a signal-bearing conductive plane and a ground plane, providing noise reduction without requiring complex capacitor networks. This extraction of the essential function (noise reduction) while removing unnecessary complexity (capacitor stitching) directly resolves the technical contradiction.
Solution Approach 2:
The patent changes the structural parameters of the via configuration. Instead of using capacitors connected between multiple planes, the invention uses a via with specific geometric parameters (positioning, coupling orientation) to achieve noise reduction. The via is positioned to couple specific planes and oriented to minimize interference, transforming the noise reduction mechanism from electrical parameter-based (capacitance values) to geometric parameter-based (via position and orientation).
2Object-affected harmful factors
If ground planes are stitched together at the periphery using closely spaced vias to reduce radiated EMI, then radiated EMI is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent inverts the conventional ground plane stitching approach. Instead of stitching ground planes together with closely spaced vias to reduce radiated EMI, the invention uses a single via to couple a signal-bearing plane to a ground plane. This inversion of the problem-solving approach (from stitching multiple ground planes to coupling signal and ground planes) maintains EMI reduction effectiveness while dramatically reducing manufacturing precision requirements, as only one via needs to be positioned accurately rather than multiple closely spaced vias.
3Ease of operation
If vias are used to provide electrical connections between layers, then connectivity is improved, but noise problems increase
Solution Approach 1:
The patent introduces a ground plane as an intermediary element in the via configuration. The via couples a signal-bearing conductive plane to a ground plane, using the ground plane as a reference and shielding intermediary. This intermediary ground plane helps contain the electromagnetic fields generated by the via, preventing noise propagation to other signal paths while maintaining the necessary electrical connectivity between layers. The ground plane acts as a mediator that enables connectivity without generating harmful noise effects.
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 electrical noise emissions by creating a voltage differential between conductive planes and vias, thereby minimizing interference with other vehicle electrical systems.
Implementation Method 1
A differential electrical signal is connectable to the conductive planes so that the vias are alternately energized by the differential electrical signal when the differential electrical signal is connected to the conductive planes
Data Source
AI summary
A printed circuit board having at least two spaced apart conductive planes. A plurality of vias extend between the two spaced apart conductive planes with the vias being electrically connected to a selected one of the two conductive planes in an alternating pattern. A differential electrical signal is connectable to the conductive planes so that the vias are alternately energized by the differential electrical signal when the differential electrical signal is connected to the conductive planes.