PCB科技 - PCB工程師需要注意的問題

什麼 印刷電路板 engineers need to pay attention to
Many 印刷電路板 工程師經常繪製電腦主機板，並且非常精通allegro等優秀工具. 然而, 遺憾的是，他們很少知道如何控制阻抗以及如何使用工具進行信號完整性分析. 對於IBIS模型, 我想是真的 印刷電路板 master應為信號完整性專家, 不僅僅停留在連接線和通孔上. 佈置一塊木板很容易, 但很難找到一個好的.
確定功率數後, 地面和訊號層, 它們的相對排列是每個 印刷電路板工程師 cannot avoid;
The general principle of the arrangement of the veneer 層:
The bottom of the component surface (the second layer) is the ground plane, which provides the device shielding layer and the reference plane for the top layer wiring;
All signal layers are as close as possible to the ground plane;
Try to avoid two signal layers directly adjacent;

The main power source is as close as possible to it correspondingly;
takes into account the symmetry of the laminated structure.
用於主機板的層佈局, 現有的主機板很難控制並行長距離佈線. For the board-level operating frequency above 50MHZ (refer to the case below 50MHZ, please relax appropriately), it is recommended to arrange the principle:
The component surface and the welding surface are a complete ground plane (shield);
No adjacent parallel wiring layers;'
All signal layers are as close as possible to the ground plane;
The key signal is adjacent to the ground and does not cross the partition.
注意：設定特定 印刷電路板層, 應靈活掌握上述原則. 基於對上述原則的理解, 根據單板的實際要求, 如：是否有關鍵佈線層, 電源設備, 需要劃分地平面, 等., 確定各層的佈置, 不要直接照搬, 或者堅持住.
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