Author Topic: how would you connect these power planes  (Read 179 times)

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Offline hsn93

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  • Country: bh
how would you connect these power planes
« on: August 17, 2018, 12:52:31 am »
hello,

how would you connect these planes which are close to each other

VDDIO - 3v3
VDDCORE 1v2



having 4 layers pcb .. (should i consider 6?)
is it ok to have the 3v3 plane on layer 2 , and 1v2 on layer 3 ? or i should put a ground plane in between them ??
like this:

i try my best to put all component in the top layer as well.

suggestions?
 

Offline hsn93

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  • Posts: 38
  • Country: bh
Re: how would you connect these power planes
« Reply #1 on: August 19, 2018, 07:06:48 pm »
hello, i though this is to generic question and thats why nobody answered.

for me i asked because i dont know what is good way to approach this,


so i will put another picture with a specific question:


shown in the picture 3 planes in (top plane red = gnd) - 2nd layer brown (3v3) - 3rd layer cyan (1v2)
not shown (bottom layer blue = gnd)

there is highlighted net which i can route in any layer. i remember that i watch videos of dave "or fedevel academy" saying its good practice to route in one layer as much as possible .. the thing is that this will cut the ground
"long trace = cut the plane"

now what would be the best practice

to route in top layer and place vias between top and bottom ground planes like this?


or to change the layers of the net like this:

 


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