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4 layer board vs. 2 layer board layer stack up

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robismyname

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I have a trivial question about board stackups between 4 layers and 2 layers pcb's

All of my training documents use 4 layer boards. Using layer 1: top, layer 2: ground, layer 3: power, layer 4: bottom.

I have a few questions about the board stackup.

1) The top layer is a signal layer?
2) The bottom layer is a signal layer?
3) In my training documents the CAM planes (power and ground) are in the middle. If i were to design a 2 layer board with layer 1: top, layer 2: bottom. Is it ok to make the top layer the signal path and the bottom layer ground? or do I have to add a third layer called bottom and place the ground between the bottom and top?
 

hi robis,

top layer and bottom layer is signal layer if want to design 2 layer top and bottom is enough no need to assign extra layer like ground or power (planes). usually layer are assign
in multiplication of 2 like 2 layer,4 layer, 6 layer because copper material has two side top and bottom,if you used one layer extra ,in manufacturer side copper will be waste.

just check post has already discussed regarding this topic
 

Copper layers have to be in pairs to keep the laminate structure balanced, odd copper layer boards will generally warp quite badly.
 

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