Multiple layers make it easy for the PCB traces to route by jumping over from one layer to another to complete the path. Hence many complex circuits can be routed easily.
Also the demand for compact electronic devices boosts the need for multiple layers PCB.
In PCBs with 4 or more layers, supply and ground is separated. This offers isolation between supply and ground pins and hence avoids short circuit.
Read More: Multilayer PCB
#PCB Design
I have some PCBs that were wave soldered but the vias still remain open, they are not filled nor plugged form what I can see. I do not see any solder on the annular rings of the vias either. How do they go about doing so?
My EDA software (PCAD, but I guess others do this too) adds thermal reliefs on vias in a copper pour. What’s the use? Vias aren’t soldered.
Recently we are developing a portable device which should be very tiny and light. In terms of PCB design, I am thinking whether it is a good idea to exclude ground plane to minimize the product size.
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