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Old 03 December 2019, 13:56   #4
Mick
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Join Date: Jan 2004
Location: Yorkshire
Posts: 558
Does the walled off area on the bottom connect to the walled off area on the left via a thick trace?

I'm only going by what I've learned in the last 6 months or so but it looks to me like they've partitioned the ground plane to keep digital noise out of the analogue ground areas, the walled off area on the bottom is audio components and I'd guess that it connects to the walled off area on the left and then connects to the normal (digital) ground at the audio connectors, the video components area has a u shaped wall around it so that digital noise won't go through and pollute the video components' analogue ground area.

On my A1200 design I've struggled to auto route it to 4 layers so I've done it 6 layers and I have two different ground layers, one for analogue and one for digital.

Last edited by Mick; 03 December 2019 at 15:02.
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