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I used op-amp for my project and supplied with +12 and -12 volts. My PCB will have 4 layers which are TOP (signal layer), POWER (internal plane), GROUND (internal plane), BOTTOM (signal layer). When I split the power plane for supply voltages such as +12V, +5V , +3.3V . I'm confused where to set my -12V power for op-amp supply.

Should I set -12V to POWER plane or GROUND plane and why?

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In the vast majority of applications -12V is a power net, while GND is, well, GND.

For a design with many different power rails it's better practice to just run power traces on the power layer, rather than trying to split it up into different pours.

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Thank you so much. I also found that e-book which has the same suggestion.

enter image description here

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