A backplane PCB, also known as a motherboard pcb, is a substrate that carries functional pcbs, including child pcbs or line cards. The main task of the backplane is to carry the sub-pcbs and distribute power to the functional pcbs for electrical connection and signal transmission. Therefore, the system function can be obtained through the cooperation of the backplane and its sub-pcbs.

With the improvement of the integrity of electronic (IC) components and the increase in the number of I/Os and the rapid development of electronic technology assembly, after high-frequency signal transmission and high-speed digitization, the function of the backplane gradually covers the carrying, signal transmission and distribute. To achieve these functions, backplanes must meet higher requirements, including layer count (20 to 60 layers), board thickness (4mm to 12mm), number of vias (30,000 to 100,000), reliability, frequency, and signal transmission.

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