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Medical Device PCB stack up, 6 layers.
, 09-15-2025, 05:42 PM
Hi @Robert Feranec and all. I need opinions about to use all dielectrics using FR-4, and an opinion to use L5 Signal and L6 GND Plane. Thanks in advance. Its so difficult find videos or real information about medical devices PCB design.
Robert Feranec , 09-15-2025, 10:55 PM
usually I would like to use the materials that are used and stocked by PCB manufacturers ... otherwise there are many problems. Also, material will influence what is the minimum track width you can have for example for 50OHM tracks and it inflences how far the GND layer will be from signal layer. So I normally just check what stackups the manufactuerer can build and select the one wich canoffer narrow traces (for high density PCB) or the stackup that has signal layer close to GND reference plane.What problem are you expecting with L5 and L6 layers?
, 09-16-2025, 12:09 AM
Usually on stackup we use GND at L2 and L5 and L1 referenced to L2, and L6 referenced to L5. But, consulting web, using L6 as GND plane we achive a cage faraday in respect to L5 (signal).
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