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why we need power plane in PCB design, suppose i have 6 different supply rails like 1.2v,1.8v, 2.5v, 3.3v and 5v and 12v supply then how much power plane do i need , and how can arrange them Layer stack up

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  • \$\begingroup\$ please give some suggestion .....your suggestion would be very helpful for me ....thanks \$\endgroup\$ – Balram Jatav Dec 8 '17 at 11:14
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    \$\begingroup\$ How many layers have you planned in your PCB? \$\endgroup\$ – FlyerDragon Dec 8 '17 at 11:29
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    \$\begingroup\$ Work out the requirements for each supply individually ... some may be low current or only to a few components; these won't usually need a power plane. You may be able to group all the 2.5V components and their regulator together for example. If you're still in doubt, add this info to the question. \$\endgroup\$ – Brian Drummond Dec 8 '17 at 12:41
  • \$\begingroup\$ i planned for 12 layer. i need at least 8 layer to route my board bcoz high speed routing is involve in board.@flyerdragon. \$\endgroup\$ – Balram Jatav Dec 11 '17 at 4:24
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It depends totally on where you need the power, how much power and on your power integrity requirements.

I have done things like that on a single plane, or on 4 planes, it just depends on what you are about.

I would note that running a split power plane with a closely coupled high speed signal layer is a bad idea from a return current perspective, so some care is advised, but there is nothing inherently wrong with split (even very split) planes if your part placement works with that.

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