Small Form Factor Interposer for High-Density Signal Routing
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Solution Overview
Problem
Signal traces in printed circuit boards often fail to provide the necessary signal density and integrity for transmitting high-speed signals, such as those above 25 GHz, between components mounted in the midboard and connectors or other components at the periphery of the PCB.
Innovation Solution
A midboard cable termination assembly is used, which includes a frame, a lid, and an interposer, allowing for the termination of multiple cables and providing a compact, high-density connection between the paddle card and the printed circuit board, with the interposer having a small form factor and high contact density to ensure reliable signal routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal traces in printed circuit boards are used to transmit high-speed signals, then the system structure is simple and cost-effective, but signal density and integrity deteriorate at distances where signal propagation results in unacceptable losses
Solution Approach 1:
The patent introduces an interposer as an intermediary component between the paddle card and the printed circuit board. This interposer provides a dedicated high-speed signal path that acts as a mediator, allowing signals to bypass the lossy PCB traces for critical high-speed connections while the PCB itself remains structurally simple. The interposer contains embedded cables or conductors that provide low-loss signal transmission paths.
Solution Approach 2:
The patent segments the signal transmission path into two distinct parts: the PCB traces for general-purpose connections and the interposer for high-speed signal paths. This segmentation allows each component to be optimized for its specific function - the PCB maintains structural simplicity while the interposer provides high-integrity signal transmission for distance-critical connections.
2Reliability
If conventional connectors are used to connect components at the periphery of the PCB, then the connection method is simple and cost-effective, but signal density is insufficient for high-speed signals above 25 GHz
Solution Approach 1:
The patent implements a nested structure where the interposer is positioned between the paddle card and the PCB, creating a layered connection architecture. The interposer contains cables or conductors that are essentially nested within the connection interface, providing high-density signal paths without increasing the overall footprint of the connection system.
Solution Approach 2:
The patent transitions from two-dimensional PCB trace routing to three-dimensional signal paths by introducing vertical stacking through the interposer. This dimensional change allows multiple high-speed signal channels to be packed into a compact space, dramatically increasing signal density without expanding the planar area of the connection interface.
3Reliability
If cables are used to route signals from the I/O connector to the processor assembly, then signal integrity is maintained, but the device size and complexity increase
Solution Approach 1:
The patent embeds the cables within the interposer structure, nesting them in a compact arrangement between the paddle card and PCB. This nesting approach allows multiple cables to be packed into a small volume, maintaining signal integrity through dedicated cable paths while minimizing the overall device size increase.
Solution Approach 2:
The patent merges the cable routing function with the interposer structure itself. Rather than adding separate cable management components, the interposer integrates cable holders, alignment features, and structural support into a single combined component, reducing overall device complexity and volume.
Data Source
AI summary
A short, high density interposer. The interposer has multiple contacts, with upwards and downwards-facing contact surfaces. Each of the contacts may be formed as a beam stamped from a sheet of metal. Two sheets of metal may be used in forming the interposer. A first sheet may be stamped with upwards facing contacts. A second sheet may be stamped with downwards facing contacts. Bases of the beams on the first sheet may be fused with bases of the beams on the second sheet, creating a conducting path through the interposer, with compliant contacts at each end. The joined contacts may be separated from the sheets from which they are stamped and held together with an insulative base of the interposer. Beams shaped to form contacts in the interposer may be closely spaced when stamped in a sheet of metal and may have a low height.