2-PCB a strati 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-strati 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. però, most of the time 2 layer is not a viable option.
Leggi di più: Dovrei usare PCB a doppio strato o PCB a strato singolo?
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