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I've tried routing before and after pouring a GND on the bottom layer. I get many GND traces running on the top layer for no apparent reason? Tried without a GND layer, added it after the auto-router - but it did not help.

Any idea what would be the best way to make sure the router puts a via near SMD components that should connect to GND on the bottom side and not run traces?

TonyM
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user733606
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1 Answers1

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Tried without a GND layer, added it after the auto-router - but it did not help.

It's simple; don't use an auto-router. The details in your question clearly indicate that your auto-router is stupid so, don't use it. If you insist on using your auto-router then manually connect GND tracks to the ground-plane with vias and delete the offending track.

In all my history of designing PCBs, I've never used an auto-router and I don't intend to start any time soon.

Neil_UK
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Andy aka
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    You'd think that auto-routing would be a solved problem by now - at least for not too complex boards, but despite advances in AI and processing power of seems like we're still not there... – brhans Oct 17 '21 at 12:23
  • Apparently, for those designing backplanes, it's useful @brhans. Probably because connector positions are a fixed thing mechanically. – Andy aka Oct 17 '21 at 12:24
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    This is absolutely the correct answer. – DerStrom8 Oct 17 '21 at 12:25