Staggered Conductive Structure for PCB Power Delivery
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Solution Overview
Problem
The existing electrically conductive structures in circuit boards face challenges in reducing impedance and increasing low-impedance bandwidth at high frequencies, leading to unsatisfactory power delivery and increased parasitic inductance, which affects the performance of high-speed electronic devices.
Innovation Solution
The proposed electrically conductive structure features a staggered array arrangement of coupling sections in pairs, canceling magnetic flux between adjacent current loops with opposite directions, thereby reducing high-frequency parasitic inductance and increasing the decoupling bandwidth of the embedded planar capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal conductive structures (power wire and ground wire) are used to connect electronic device contacts to power and ground layers, then electrical connection is achieved, but equivalent series inductance (ESL) is formed that increases impedance at high frequencies
Solution Approach 1:
The conductive path is segmented into multiple parallel paths (first conductive structure and second conductive structure) instead of using single wire connections. This segmentation distributes the current flow and reduces the overall parasitic inductance by creating multiple current loops with opposing magnetic flux directions.
Solution Approach 2:
Multiple conductive structures are merged into a unified configuration where the first and second conductive structures work together. The coupling sections are arranged in pairs with staggered positions, combining their effects to cancel magnetic flux and reduce ESL while maintaining electrical connection functionality.
2Reliability
If decoupling capacitors are added to reduce parasitic inductance effects, then power supply stability improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The conductive structures serve multiple functions: they provide electrical connection between contacts and power/ground layers, act as decoupling elements, and function as magnetic flux cancellation structures. This multi-functionality eliminates the need for separate decoupling capacitors, reducing device complexity while maintaining power supply stability.
Solution Approach 2:
The conductive structures themselves provide the decoupling function through their geometric arrangement and magnetic flux cancellation effect, rather than requiring external decoupling components. The structure serves its own need for reducing parasitic inductance through its inherent design.
3Object-affected harmful factors
If coupling sections are arranged in pairs with staggered positions, then magnetic flux cancellation and impedance reduction are achieved, but manufacturing precision requirements increase
Solution Approach 1:
The coupling sections are arranged in asymmetric staggered positions rather than symmetric alignment. This asymmetric arrangement creates current loops with opposite directions that cancel magnetic flux, achieving impedance reduction while the staggered pattern provides manufacturing tolerance compared to precise symmetric alignment requirements.
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 design effectively reduces impedance and enhances the low-impedance bandwidth, providing a stable power supply system for high-speed electronic devices by minimizing parasitic inductance and maintaining stable voltage levels.
Implementation Method 1
canceling magnetic flux between adjacent current loops with opposite directions, thereby reducing high-frequency parasitic inductance
Data Source
AI summary
An electrically conductive structure includes a first conductive structure and a second conductive structure. Each has a conducting section at one end and a coupling section at the other end. The first and second conducting sections are electrically connected to a power and ground contact of an electronic device, respectively. The first and second coupling sections are respectively connected with power and ground layer of a circuit board. The first coupling sections are connected with the first conducting section through first extending sections and the second coupling sections are connected with the second conducting section through second extending sections. At least two coupling sections of the conductive structures are arranged in pairs. The first conductive structure and the second conductive structure are arranged in a staggered array to form two wiring loops having opposite current directions, thereby generating a magnetic flux cancellation effect.