PCB Connector Footprint Layout for Signal Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Circuit board layout and design are complicated, especially for high-density electrical connectors, due to the need for reducing the number of layers and routing traces, which is challenging with smaller connector footprints that provide less space for vias and trace routing.
Innovation Solution
A printed circuit board (PCB) with a substrate having a connector surface and a PCB connector footprint defined along longitudinal and lateral axes, subdivided into column grouping footprints, featuring signal vias arranged in pairs with ground vias providing electrical shielding, allowing for efficient termination of high-speed, high-density electrical connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the connector size is reduced to increase density, then the connector density is improved, but the available space for vias and trace routing is reduced
Solution Approach 1:
The patent applies dimensional change by routing signal traces in non-planar paths through multiple PCB layers rather than confined to a single plane. Signal vias connect different layers, allowing traces to traverse vertically through the PCB thickness, effectively adding a third dimension to the routing space and overcoming the limited surface area constraint.
Solution Approach 2:
The connector footprint is segmented into multiple functional zones: signal contact areas, ground contact areas, via locations, and trace routing corridors. This segmentation allows each zone to be optimized independently, maximizing the utilization of limited footprint space while maintaining proper signal integrity and grounding.
2Ease of manufacture
If the number of PCB layers is reduced to lower cost, then the manufacturing cost is improved, but the routing complexity increases
Solution Approach 1:
The patent merges multiple functions into fewer PCB layers by combining power planes, ground planes, and signal routing layers in an optimized stackup. Ground and power layers are strategically positioned to provide both electrical functionality and mechanical support, reducing the total layer count while maintaining routing capability through careful trace placement and via utilization.
3Reliability
If ground vias are arranged around signal vias for shielding, then the electrical shielding is improved, but the space for signal routing is reduced
Solution Approach 1:
The patent implements nested arrangement where ground vias are positioned immediately adjacent to and surrounding signal vias in a concentric or closely-spaced pattern. This nesting provides electromagnetic shielding for the signal vias while minimizing the lateral space consumed, as the ground vias are tucked into the immediate vicinity rather than occupying separate external space.
Data Source
AI summary
A printed circuit board (PCB) includes a substrate and a PCB connector footprint defined along a longitudinal axis and a lateral axis being subdivided into PCB column grouping footprints in columns parallel to the longitudinal axis. The PCB includes signal vias arranged in pairs along a signal pair axis. The pairs of signal vias are aligned in the columns parallel to the longitudinal axis and in rows parallel to the lateral axis. The signal pair axis is non-parallel to the lateral and longitudinal axes. The PCB includes ground vias with at least one ground via arranged between adjacent pairs of signal vias within the PCB column grouping footprints and at least one ground via is arranged between adjacent pairs of signal vias in adjacent PCB column grouping footprints. This orientation is to allow more spacing between the signal vias and some ground vias to enhance signal integrity.