2-層PCB is enough to route any circuitry, at least in theory. One layer for vertical tracks, the other for horizontal tracks, connect them with via’s.
If you need route high-speed signals on the PCB, such as RF circuitry, switched-mode power supplies, and long digital buses, 4-レイヤー are required. They are widely applied in modern datasheets, high-performance semiconductors, switched-mode PSU, heat-rejecting devices.
Price of a 4 layer PCB is roughly 3x-4x higher than that of a 2-layer one. しかしながら, ほとんどの時間 2 layer is not a viable option.
続きを読む: 2層PCBまたは1層PCBを使用する必要があります?
#PCB設計
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