IC Package Substrate Cutouts for Flip-Chip Signal Integrity
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Solution Overview
Problem
Conventional IC packaging using wire bonding faces challenges in maintaining signal integrity and scalability for high-speed transceiver applications, as it occupies a large area footprint and is susceptible to cross-talk and IR drop, making it unsuitable for packaging multiple chips within optical transceiver modules.
Innovation Solution
The use of strategically placed cavities and cutouts on substrates and printed circuit boards allows for improved signal and power integrity through flip chip techniques, reducing the size of the IC package and enabling more efficient multi-chip integration by leveraging established packaging methods like die attach and soldering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonding is used for IC packaging, then electrical connections can be established, but the area footprint increases and signal integrity deteriorates due to cross-talk and IR drop
Solution Approach 1:
The patent extracts the harmful wire bonding interconnect structure from the packaging system and replaces it with direct flip-chip bonding. This removes the source of cross-talk and IR drop issues while reducing the area occupied by bonding wires and associated routing structures.
Solution Approach 2:
The patent substitutes the mechanical wire bonding process with a direct semiconductor-to-substrate bonding approach using flip-chip technology. This replacement eliminates the need for wire bonds and their associated electrical and mechanical problems while achieving more efficient electrical interconnection.
2Adaptability or versatility
If multiple chips are packaged using conventional wire bonding, then functional integration is achieved, but manufacturing complexity increases and productivity decreases
Solution Approach 1:
The patent applies preliminary action by pre-attaching multiple semiconductor chips to the substrate in their final positions before substrate mounting. This allows parallel processing and eliminates sequential wire bonding operations, significantly improving manufacturing efficiency for multi-chip packages.
Solution Approach 2:
The patent merges multiple chip attachment operations into a single integrated packaging process. By combining chip mounting, bonding, and substrate attachment into one cohesive workflow using flip-chip technology, the manufacturing process becomes more efficient and scalable.
3Reliability
If conventional IC packaging is used, then electrical connections are established, but the package size remains large reducing scalability
Solution Approach 1:
The patent transitions from two-dimensional wire routing on the surface to three-dimensional direct bonding through the substrate. Flip-chip technology allows electrical connections to be made through vertical vias and through-silicon vias, utilizing the third dimension to reduce surface area requirements and overall package volume.
Data Source
AI summary
An integrated circuit (IC) package having multiple ICs is provided. The IC package includes a printed circuit board (PCB) having a cutout region and a substrate disposed above the PCB. The substrate includes a first cavity on a first surface of the substrate. The IC package also includes a first IC disposed on a second surface of the substrate and in the cutout region of the PCB, The IC package further includes a second IC disposed above the substrate, and a first device disposed on the second IC and in the first cavity on the first surface of the substrate.