Stacked Board-to-Board Interconnect for Signal Integrity and PCB Density
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Solution Overview
Problem
In compact systems, maintaining signal integrity while maximizing space for high-bandwidth data transmission through embedded transceivers is a challenge due to the limited real estate on printed circuit boards.
Innovation Solution
The assembly involves stacking active devices with a flexible printed wiring board and interfacing members to efficiently transmit signals between boards, using a coupling plate and base to secure the flexible board, allowing for direct electrical coupling and preserving the form factor of the active devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If active devices are densely packed on printed circuit boards to maximize space utilization, then the real estate efficiency is improved, but signal integrity deteriorates due to restricted spaces and interference
Solution Approach 1:
The patent transitions from a two-dimensional board layout to a three-dimensional stacked configuration. Multiple active devices are vertically stacked and interconnected through through-board connections, allowing high-density packaging while maintaining signal integrity through dedicated vertical signal paths that avoid lateral interference on the board surface.
Solution Approach 2:
The patent introduces through-board connectors and interconnection structures as intermediaries between stacked active devices. These intermediaries provide dedicated signal transmission paths that maintain signal integrity by isolating signals from board-level interference while enabling compact vertical stacking of multiple devices.
2Productivity
If embedded transceivers are used for high bandwidth transmission in compact systems, then data transmission capability is improved, but maintaining signal integrity in restricted spaces becomes more difficult
Solution Approach 1:
The patent employs vertical stacking of embedded transceivers with through-board interconnections, moving signal transmission from lateral board traces to vertical paths. This dimensional change enables high-bandwidth transmission while maintaining signal integrity by reducing interference that occurs in restricted two-dimensional board spaces.
Solution Approach 2:
The patent segments the system into multiple stacked modules, each containing embedded transceivers. This segmentation allows each transceiver to have dedicated signal paths through the board, reducing signal interference and maintaining integrity while achieving high aggregate bandwidth across multiple segmented units.
3Quantity of substance
If multiple active devices are stacked and interconnected, then I/O density is improved, but device complexity increases due to additional interfacing members and connection structures
Solution Approach 1:
The patent employs universal through-board connector designs that can accommodate multiple active devices in a stacked configuration. These standardized interfacing members serve multiple functions: providing electrical connections, mechanical support, and signal routing for various devices, thereby reducing overall system complexity despite high I/O density.
Solution Approach 2:
The patent combines multiple functions into integrated interfacing members that simultaneously provide electrical connectivity, mechanical alignment, and structural support for stacked active devices. This merging reduces the number of separate components needed, lowering complexity while maintaining high I/O density through vertical stacking.
Data Source
AI summary
A method and assembly for board to board connection of active devices are described herein. The assembly comprises first and second superposed active devices, a first interfacing member electrically coupled to the first active device, and a flexible printed wiring board having a first end and a second end, the first end electrically coupled to the first interfacing member.