いつ選択すればよいですか 2 層PCBまたは 4 層PCB?

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.

• It can ensure the signal integrity, even though the return path for the signal currents is too long and the loop impedance is too high.
• The radiated EMI will be steady so as to pass CE/FCC.
• ensure that the device won’t emit too much radiation and would be robust against interference.

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