4 Layers PCB - Cover with Ground Polygon

For a 4 layers PCB, is it necessary to cover with ground polygon on Layer 1&4 necessary?

9/29/2016 2:37:52 PM

4 layers pcb multilayer pcb

I will cover all the empty spaces in the layout with Ground in simple single or doubled layer PCB. The stackup of my 4 layers PCB is as fllowing: Layer 1: top signal Layer 2: Ground plane Layer 3: Power plane Layer 4: bottom signal Since now I already got a dedicated Ground plane (Layer 2), my question is: After finished all the routing, for Layer 1 & 4, should I still cover all the emptied space with Ground as well?

rownickijan

12/17/2016 8:12:32 PM

Provide Ground Planes into the Top layer, and Bottom Layer is good. If you can't accommodate in the Top and Bottom layers, you need to make sure that you make a Top-Bottom Via which connects in the internal plane. This reduces the current return paths.

anjenkuhn

11/2/2016 12:13:17 AM

Yes, it is necessary if you can. It won't harm anyway.

ozkan

10/10/2016 4:06:06 AM

You have a few obvious options with any of the supply rails, including ground, or nothing. Since you have a bunch of supply rails a power pour would get complex.

For a 4 layers PCB, is it necessary to cover with ground polygon on Layer 1&4 necessary?

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