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

2016/9/29 14:37:52

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?


2016/12/17 20:12:32

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.


2016/11/2 0:13:17

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


2016/10/10 4:06:06

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.

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Daniel Gilbert

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