Ground Via Placement for Clock Signal Interference Reduction
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Solution Overview
Problem
High-density circuit boards experience significant interference between clock signals due to electromagnetic fields, particularly when clock components with similar harmonic frequencies interact, leading to phase noise violations and component malfunctions.
Innovation Solution
The strategic placement of ground vias on a circuit board, positioned outside the region between clock vias, reduces cross-talk coupling by creating virtual grounds and shielding electromagnetic interference, thereby improving clock signal integrity without the need for extensive physical ground via placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more clock components are positioned on a circuit board to increase density, then the computing system becomes more compact and powerful, but electromagnetic interference between clock signals increases causing phase noise violations and component malfunctions
Solution Approach 1:
The patent introduces ground vias as intermediary elements positioned between adjacent clock vias on the circuit board. These ground vias act as mediators that provide electromagnetic shielding and create virtual ground regions, thereby reducing cross-talk coupling and interference between clock signals while allowing high-density component placement.
Solution Approach 2:
The patent extracts the harmful electromagnetic fields generated by clock vias by introducing ground vias that create virtual ground regions. These virtual grounds separate and isolate the electromagnetic fields of adjacent clock signals, preventing them from interfering with each other while maintaining compact board layout.
2Object-affected harmful factors
If ground vias are placed between clock vias to reduce interference, then electromagnetic shielding improves, but manufacturing complexity and cost increase due to extensive physical ground via placement
Solution Approach 1:
The patent applies local quality by creating virtual ground regions through strategic ground via placement only in critical areas between adjacent clock vias, rather than uniformly across the entire board. This localized approach provides necessary electromagnetic shielding where interference occurs most frequently while reducing overall manufacturing complexity.
Solution Approach 2:
The patent uses the concept of virtual grounds created by ground vias to replicate shielding effects without requiring extensive physical ground via placement throughout the board. The virtual ground regions effectively copy the shielding function of physical ground structures in a more efficient manner.
3Area of stationary object
If clock signals with similar harmonic frequencies are placed adjacent to each other, then board space is optimized, but cross-talk coupling produces spurs that violate phase noise specifications
Solution Approach 1:
The patent introduces ground vias as intermediary elements between adjacent clock vias carrying signals with similar harmonic frequencies. These ground vias create virtual ground regions that act as electromagnetic barriers, preventing cross-talk coupling and the generation of spurs that would violate phase noise specifications while allowing close spacing of clock components.
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 minimizes phase noise spurs, ensuring clock signals meet specifications and maintaining component functionality, even on high-density boards, while reducing manufacturing costs and enhancing noise performance.
Implementation Method 1
An electromagnetic field generated by a signal carried by one component may result in interference in signals carried by nearby components
Implementation Method 2
creating a first virtual ground between first and second adjacent clock vias on a circuit board by transmitting a differential clock signal through the first and second clock vias
Data Source
AI summary
An apparatus for reducing interference between clock signals may include a circuit board and a first set of clock vias coupled to the circuit board. The apparatus may also include a second set of clock vias coupled to the circuit board in a linear pattern adjacent to the first set of clock vias. The first set of clock vias may transmit a first clock signal and the second set of clock vias may transmit a second clock signal with a frequency that is different from the first clock signal. The system may further include a ground via coupled to the circuit board in line with the second set of clock vias. Each ground via coupled to the circuit board may be positioned outside any region of the circuit board located between the first and second sets of clock vias. Various other apparatuses, systems, and methods are also disclosed.