Kill the PCB board

Almost all electronic devices, the PCB board is the cornerstone of various components, and it will not form a complete system, but now, researchers are studying how to kill the PCB board. IEEE SPECTRUM magazine recently published the latest results of Puneet Gupta, Subramanian Iyer, California, Los Angeles, with Silicon-Interconnect Fabric / Si-IF, can use silicon material instead of the current PCB board, thus Smaller, more lightweight or other dimensional devices, can also integrate the calculation performance of dozens of servers on a silicon wafer in a plate size. At the same time, there is a new silicon interconnection, and the chip manufacturer can get rid of relatively large, complex, difficult to manufacture, only a group of small, simple, easy manufacturing, close interconnected chips (chiplet). Semiconductor companies such as Intel, AMD, NVIDIA are doing small chips, but they still have to solve scalability, packaging, interconnect, and silicon interconnect networks are considered more ideal. Specifically, the researchers envisaged a thin thickness of only 500 microns to 1 mm, processor, memory, simulation, and radio frequency chip, voltage module, and even capacitors, resistors, can be placed. It is on, and a three-fold copper column can be placed on the silicon substrate to replace the conventional welding bridge convex. This can form a connection between copper and copper, far more reliable than conventional soldering, and less material, more important, the size of the chip I / O input and output ports can be reduced from 500 microns to about 10 microns, integrated density Can increase 2500 times, while also improving heat dissipation. In a server design study, if a silicon-free-free unpackable processor is used, the performance can be doubled than the conventional processor, and the original 1000 square centimeter PCB panel area is reduced to 400 square centimeter silicon wafers, weight also Reduce from 20 grams to 8 grams. Unfortunately, the researchers did not publish any design or schematic.

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