General > General Technical Chat

"Grounding" according to Analog Devices

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JohanH:
Here's a list of literature that Rick Hartley recommends:

https://resources.altium.com/p/reading-list-emi-noise-control



JohanH:
To be noted that @RobertFeranec on Youtube has many sessions and interviews with Rick Hartley.

exe:
I quickly skimmed through the article and I don't see horrors that you guys suggest. Their example of adding slits makes perfect sense to me: to prevent high currents going through sensitive analog part where space is at premium and relocating components away from current paths is not an option ("due to the realities of the mechanical design").

I guess what we are talking here is that modern best practice is to have an uninterrupted ground plane, use of 4+ layers pcb, route digital signals on adjacent to gnd layer, and minimize interference between components by carefully placing them so their "return" paths do not overlap.

wraper:

--- Quote from: exe on February 18, 2023, 09:15:59 am ---I quickly skimmed through the article and I don't see horrors that you guys suggest. Their example of adding slits makes perfect sense to me: to prevent high currents going through sensitive analog part where space is at premium and relocating components away from current paths is not an option ("due to the realities of the mechanical design").

I guess what we are talking here is that modern best practice is to have an uninterrupted ground plane, use of 4+ layers pcb, route digital signals on adjacent to gnd layer, and minimize interference between components by carefully placing them so their "return" paths do not overlap.

--- End quote ---
The thing is that return path at high frequencies go only right under the traces if there is a solid ground plane, so they will not travel to somewhere far away into the analog part. And if you have traces which go over a slit in the ground plane, you create more problems than you solve as energy somehow needs to travel in the return path and it won't go over remote connection between analog and digital grounds. Note that frequency is not a frequency of digital signals but a rise time.



exe:

--- Quote from: wraper on February 18, 2023, 09:27:46 am ---The thing is that return path at high frequencies go only right under the traces if there is a solid ground plane, so they will not travel to somewhere far away into the analog part.

--- End quote ---

For digital signals yes, but that doesn't apply to low frequency analog signals. So no digital traces should go between analog parts, right?

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