Printed Wiring Board Power Noise Suppression
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Solution Overview
Problem
Existing printed wiring boards fail to sufficiently reduce power supply noise, leading to electromagnetic wave radiation due to the spread of noise across power supply and ground layers.
Innovation Solution
A printed wiring board design featuring isolated electrically-conductive power supply and ground layers with contoured islands and connecting pieces that narrow the current path, along with capacitors to capture noise, enhancing interlayer capacitance and electrostatic coupling to suppress noise and radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply and ground layers are connected through vias to bypass capacitors, then the bypass capacitor can reduce power supply noise, but the noise spreads over the entire power supply and ground layers and cannot be sufficiently reduced
Solution Approach 1:
The power supply layer and ground layer are segmented into multiple isolated islands rather than continuous layers. Each island is separately contoured based on the projected image of electronic circuit elements, creating discrete power supply and ground regions that prevent noise from spreading across the entire layer.
Solution Approach 2:
The patent applies different electrical connectivity characteristics to different regions of the power supply and ground layers. By creating isolated islands with specific contoured shapes matched to circuit element projections, each region provides localized noise containment while maintaining necessary electrical connections through conductive pieces.
2Power
If the path of electric current between power supply layers is widened, then current flow is improved, but noise can spread more easily across the layers
Solution Approach 1:
The conductive pieces are designed with locally optimized properties - they provide sufficient cross-sectional area for current flow while maintaining narrow dimensions in the direction that would allow noise propagation. This localized control of geometry enables simultaneous achievement of good current conduction and noise containment.
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 reduces power supply noise and prevents electromagnetic wave radiation by forcing noise through conductive pieces into capacitors, ensuring reliable noise suppression and waveform integrity.
Implementation Method 1
a capacitor connected to the first and second electrically-conductive pieces
Implementation Method 2
a first electrically-conductive piece connecting the second electrically-conductive power supply layer to the first electrically-conductive power supply layer
Data Source
AI summary
A first power supply layer spreads over an insulating layer outside an island of a second power supply layer. A first ground layer spreads over an insulating layer outside an island of a second ground layer. First and second electrically-conductive pieces are interposed between the first and second power supply layers as well as between the first and second ground layers. A capacitor is interposed between the first and second electrically-conductive pieces. Power supply noise is forced to inevitably pass through the electrically-conductive pieces. The power supply noise thus reliably flows into the capacitor through the first and second electrically-conductive pieces. A printed wiring board is in this manner allowed to enjoy a sufficient suppression of the power supply noise.