How to decide of number of layers

1. How to decide of number of layers

Could anyone tell me how to decide the number of layers?

:) •

2. Re: How to decide of number of layers

For low frequencies two will work. For higher frequencies four is the minimum to pass EMI tests. From there it is the number of interconnects. Once you get into the ECL range and use differential pairs, you put them on inner layers between two ground planes. 3. Re: How to decide of number of layers

It really depende on the application, the cost restriction and complexity involved and of course the frequency wether it is Analog or Digital or mixed circuit.

If you specify more maybe we can help with suggestions •

4. Re: How to decide of number of layers Originally Posted by gam
It really depende on the application, the cost restriction and complexity involved and of course the frequency wether it is Analog or Digital or mixed circuit.

If you specify more maybe we can help with suggestions
My PCB is for 200MHz and digital circuit only.
Thankz~~ •

5. How to decide of number of layers

for 200MHz u should go for atleast 4 layer, and may add up depending upon the net density. 6. Re: How to decide of number of layers

Contact firms who will make your PCBs and ask them how many layers they can make so thats max num of layers which you can apply.

In my country its 2 layers max.

Mr.Cube 7. Re: How to decide of number of layers Originally Posted by mrcube_ns
Contact firms who will make your PCBs and ask them how many layers they can make so thats max num of layers which you can apply.

In my country its 2 layers max.

Mr.Cube
8O only two layers. so how u do highspeed design ckts

binu g •

8. How to decide of number of layers

signal speed, ref layers need, and crosstalk... etc. 9. Re: How to decide of number of layers

I guess it's tightly depend on your voltage levels used.
If the most of voltage levels are the same one, you can use 4layers.
And if you need wire a lot of transmission lines to compensate impedence, maybe you need 6 layers. You can try and error.
Good Luck. 10. Re: How to decide of number of layers

The number of layers in a circuit board are determined by:

1. Are you going to control impedance? If so, then you need a continuous reference plane adjacent to the controlled impedance signal layer.
2. The number of layers should be even, and the core and prepreg dielectric thicknesses should be balanced. Odd number of layers, or unbalances thicknesses, in a stackup generally result in warping and/or cupping in the finished board.
3. Are there critical traces that need to be isolated from other signals? If so, you may need to dedicate a layer to them.
4. Are there multiple power supplies? If so, you may want to include a split power plane to distribute the power. The split plane should be adjacent to a continuous ground reference plane. High speed/critical signal traces should not be adjacent to the splits, because the return path will be interrupted.
5. Will the frequencies used tend to radiate from the board? If so, you may need to flood the outside layers with grounded copper. The signal layers would then be internal, and you would still need to consider 1-4 above.

As you can see, there is no cookbook answer - it depends on what you are trying to do (this is also called "engineering"). --[[ ]]--