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Comments on Shared ground path vs shared supply path

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Shared ground path vs shared supply path

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Hi. I am just getting into PCB design and I consistently see recommendations to never share return paths between signals. It seems this is to avoid noise due to the shared impedance of the return path. What I understand from this is to ensure that each signal has its own path trace/via/plane to ground. However, I have never seen any mention of sharing or splitting the power path (supply path?). Examples will just show 1 or 2 longer traces that branch out as they go, at various points along the board to supply power to components. Surely the shared supply path would introduce this same noise that a shared ground path would? Why is it so important to separate the ground paths, but when it comes to power, just do whatever? Perhaps I am misinterpreting the guidelines.

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Requesting more context
Nick Alexeev‭ wrote about 8 hours ago · edited about 7 hours ago

Could you please edit your question and add a few things:
. Links to the guides which you’ve read.
. What types of signals and blocks will be on your PCB? What’s the purpose of the PCB? What type of PCB are you’re designing, generally speaking? Advice would be different if you have an op-amp circuit vs discrete transistor circuit, power electronics vs small signal electronics, DC vs high speed.
That would help us answer your question and help you along. Otherwise we risk writing yet another guide like what you’re already grappling with.