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I have noticed that professionally done board always fill top and bottom with GROUND planes. As i have been making PCB board myself i find that having the top layer POWER fill and bottom layer a GROUND fill.On 2 Layer PCB what are differences between using POWER and GROUND fills as opposed to GROUND and GROUND fills?

Further more for Multi-Layer PCBs I have noticed that the stacked seems to be like SIGNAL GROUND POWER SIGNAL. why is that? wont filling the outer most layer with ground/power protect the signal traces more?

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  • \$\begingroup\$ Does this answer your question? The best stack-up possible with a four-layer PCB? \$\endgroup\$ – Justme May 28 '20 at 4:08
  • \$\begingroup\$ I have noticed that professionally done board always fill top and bottom with GROUND planes - that would be very unusual if not downright wrong in 99% of jobs. You are probably mistaken. \$\endgroup\$ – Andy aka May 28 '20 at 8:50
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    \$\begingroup\$ The biggest thing for a ground-plane is for it to be unbroken - you don't want a bunch of islands where return current has to travel a huge path-length to actually return. That's why internal layers are often desirable, they're just a solid, continuous flood of copper with no traces, just vias coming down through it. \$\endgroup\$ – Orotavia May 28 '20 at 13:25
  • \$\begingroup\$ @Justme partially though, how about the 2 layer pcb? what would be the difference PWR-GND to GND-GND \$\endgroup\$ – DrakeJest May 28 '20 at 17:27
  • \$\begingroup\$ @Andyaka true, i cant even tell if the board is even professionally or not made. It more like an observation i made that GND-GND fill is what seems to be popular or what is see most of the time. \$\endgroup\$ – DrakeJest May 28 '20 at 17:29

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