PCB Resonator Conductor Suppressing Common Mode Noise
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Solution Overview
Problem
Existing print circuit boards face challenges in selectively inhibiting the propagation of common mode signal components in differential transmission lines, leading to reduced yield due to variations in the frequency domain caused by positional deviations in the resonator structure components.
Innovation Solution
A print circuit board design incorporating a ground conductor layer, strip conductors, a resonator conductor, and via holes, where the resonator conductor intersects with the strip conductors in a specific orientation and length, and is connected to the ground conductor layer through dielectric layers, allowing for selective inhibition of common mode signal propagation while maintaining differential signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a resonator structure is coupled to the differential transmission line to inhibit common mode signal propagation, then the common mode noise suppression is improved, but the manufacturing precision deteriorates due to positional deviation between via holes and resonator conductor
Solution Approach 1:
The resonator conductor is designed with an asymmetric structure where one end is open and the other end is short-circuited to the ground conductor layer. This asymmetric configuration creates a unique electromagnetic field distribution that makes the resonator less sensitive to positional deviations of the via holes, thereby maintaining common mode noise suppression effectiveness even when manufacturing precision varies.
Solution Approach 2:
The patent specifies that the line length of the resonator conductor should be 0.4 wavelength or more and 0.6 wavelength or less at the frequency corresponding to the bit rate. By optimizing this parameter range, the resonator achieves effective common mode signal inhibition while tolerating certain positional deviations in via hole placement, thus resolving the contradiction between noise suppression and manufacturing precision.
2Object-affected harmful factors
If the resonator conductor line length is increased to improve common mode signal inhibition, then the noise suppression effectiveness is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes the resonator conductor line length to be within 0.4 to 0.6 wavelength at the operating frequency. This parameter optimization ensures effective common mode signal inhibition while avoiding excessive line lengths that would increase device complexity and occupy unnecessary board space.
Solution Approach 2:
The resonator structure is segmented into distinct functional portions: a first portion extending from one via hole in a first direction, and a second portion extending from the other via hole in a second direction. This segmentation allows for flexible layout and simplifies the overall device structure while maintaining effective noise suppression.
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 design effectively suppresses common mode signal propagation in the desired frequency domain, reducing yield loss and manufacturing costs, while maintaining the integrity of differential signal transmission.
Implementation Method 1
a resonator structure is configured to include a ground conductor layer, a resonator conductor, and a pair of via holes connecting the resonator conductor and the ground conductor layer
Data Source
AI summary
Provided is a print circuit board including: a ground conductor layer; a pair of strip conductors extending along a first orientation; a first resonator conductor three-dimensionally intersecting with the pair of strip conductors along a second orientation; a pair of first via holes connecting the first resonator conductor and the ground conductor layer; and a dielectric layer including the first resonator conductor therein, and being disposed between the ground conductor layer and the pair of the strip conductors. A distance H1 between the pair of strip conductors and the ground conductor layer is twice or more a distance H2 between the pair of strip conductors and the first resonator conductor, and a line length L of the first resonator conductor is 0.4 wavelength or more and 0.6 wavelength or less at a frequency corresponding to the bit rate.