Horizontal Inductor Array Reduces PCB Noise Coupling
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Solution Overview
Problem
The placement of inductors on printed circuit boards (PCBs) restricts signal routing due to magnetic noise coupling, limiting high-speed signal transmission and increasing PCB size, as conventional vertical inductors require keep-out zones to prevent signal quality degradation.
Innovation Solution
The use of horizontal inductors with coiled wire bodies oriented parallel to the PCB surface, allowing signal lines to be placed closer to the inductor while minimizing noise coupling, and the implementation of horizontal inductor arrays that reduce the footprint and eliminate the need for keep-out zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vertical inductors are used on PCB, then inductor functionality is maintained, but signal routing is restricted due to magnetic noise coupling
Solution Approach 1:
The patent transitions from conventional vertical inductors to horizontal inductors, changing the orientation dimension. This dimensional change allows the inductor's magnetic field to be oriented parallel to the PCB surface rather than perpendicular, enabling signal routing directly beneath the inductor without significant noise coupling, thus resolving the contradiction between signal quality and routing flexibility
2Reliability
If keep-out zones are implemented around inductors, then noise coupling is reduced, but PCB area increases
Solution Approach 1:
By rotating the inductor orientation from vertical to horizontal, the patent eliminates the need for keep-out zones around the inductor. The magnetic field is now oriented parallel to the PCB surface, allowing signal traces to be placed directly beneath the inductor footprint, thereby reducing the overall PCB area while maintaining signal integrity
3Area of stationary object
If inductors are placed close to signal lines, then PCB size is reduced, but noise coupling increases
Solution Approach 1:
The patent changes the spatial dimension of the inductor orientation to horizontal, parallel to the PCB surface. This allows the inductor to be placed close to signal lines without generating significant noise coupling, as the magnetic field is oriented along the surface rather than perpendicular to it, thus reducing PCB size while minimizing harmful electromagnetic interference
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 configuration improves signal integrity for high-speed signals, enables compact PCB layouts, and reduces noise coupling by up to 80%, allowing for more efficient use of PCB space and improved performance in high-speed applications.
Implementation Method 1
the inductor configured to generate magnetic field lines that directionally follow the signal routing lines
Data Source
AI summary
For circuit boards that may be used in computing devices, a horizontal inductor, or an array of such inductors, may be coupled to a circuit board having a plurality of signal routing lines in a second layer from a surface of the circuit board and the horizontal inductor is positioned over these signal routing lines and may generate magnetic field lines that directionally follow the signal routing lines. The horizontal inductor may have a coiled wire with a central axis that is oriented horizontally with the surface of the circuit board. The horizontal inductor, or an array of such inductors, may be coupled to a support board attached to the circuit board.