Multilayer PCBs A single piece of fibreglass can be coated on the front and back with copper – this is a 2-layer PCB For more layers boards can be made separately and laminated together This gives more layers that tracks can be mounted on Often whole layers are selected as ground layers which improves noise performance Vias connect between the different layers 4 and 6 layer boards are common, can go up to around 38 layers
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