PCB layer stack-up considerations

[srohini]

Hello,

Can anybody tell me what is the main consideration to decide layer stack up?

 

[vinodkumar]

i designed in such a way that all signal layers are guarded by power supply or gnd planes....

example:

1)TOPLAYER
2)GND
3)signal1
4)power1
5)signal2
6)power2
7)signal3
8)bottom layer

 

[srohini]

Thank you for the prompt reply.
but on which criteria we decide that which signal should be on Top layer & which signal should be in Inner layer?
Pl hel me.

 

[john blue]

https://www.semtech.com/images/datasheet/rf_design_guidelines_semtech.pdf

 

[iwpia50s]

Which signals go on which layer is up to you and how difficult it will be to route. Your main consideration is impedance and coupling of high-speed signals. You may need to route a shield around fast signals. You may want to investigate microstrip and strip-line design, your layer stack could possibly be reduced.