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Problem with 4 layer ground plane
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palimpalim 4 years ago
Hello everyone! I'm designing a 4 layer pcb with a ground plane (AGND) in one of the sandwiched layers. All connections work fine except for the AGND plane. In this net I get incomplete connection errors for every single node attached. ![AGND_NC.jpg](//image.easyeda.com/pullimage/8V15Ya44XBucpuTTghdPreL07lwKnOkxj1HHFcc5.jpeg) As you can see in the following picture, all vias which should connect to AGND seem to be connected while those connected to other nets are not (as expected). ![AGND-NC2.jpg](//image.easyeda.com/pullimage/KbMyqnQnP0FQG6nTeWrQUKaAo5o9Nsrukgt2LzME.jpeg) The AGND net plane connects to a pin header, which also seems to be connected as expected: ![AGND_NC3.jpg](//image.easyeda.com/pullimage/mvwTw150hmAqJzHEkLx08AcGJHcpz6ENat90hpsQ.jpeg) I only get the incomplete connection error for the AGND plane, all other connections seem fine. I also don't get any DRC errors with this layout, so I think I overlooked something trivial here. I would be very grateful for any help, Cheers!
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andyfierman 4 years ago
Your project is private so only you can see all the information that you have available to help us try to diagnose the problem so this is just a guess. I suspec that there is on or more AGND pads or vias that are not connected by copper for some reason. This could be due to the copper area being unable to flood into the area around those pads or vias. The incomplete net flagging in the Design manager just tells you that not all connections on the net are connected by copper. 2 out of 3 pads on the BOO net connected by copper: ![image.png](//image.easyeda.com/pullimage/tyv3uHIH0lFhyGuGHClp2dSQGx5v99ncl025t2zf.png) All 3 pads on the BOO net connected by copper: ![image.png](//image.easyeda.com/pullimage/V9iOtyslTvPQpzvIZcy99Y9CYxBsDivQoxTWhzce.png)
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palimpalim 4 years ago
Thanks for your answer, I've made the project public now. I don't think that it's a loose connection, I double and tripple checked. I can't be 100% sure though, so a critical check from your side would certainly help. Thanks for taking your time!
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andyfierman 4 years ago
And as requested in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a) the url to the project is?
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palimpalim 4 years ago
Oh, sorry! [https://easyeda.com/palimpalim/adc8](https://easyeda.com/palimpalim/adc8)
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andyfierman 4 years ago
Found it. Missing track between via and bottom layer pad: ![image.png](//image.easyeda.com/pullimage/8X92ckxkOEIdxN0EDhMnD1NBO0XBHSiebbIs6uNv.png) You need to use the Design Manager and check every connection until you find the missing one. ![image.png](//image.easyeda.com/pullimage/LqEhi9vWQuEnfjQgPiWeFjO88jgnCKBRchDAddW6.png) Also... Something strange about your schematic: the drawing frame is being seen as a component that is to be converted onto the PCB! ![image.png](//image.easyeda.com/pullimage/OpZfmY81O0YmphMqJOuOHuHcn3VnfHOkLkE3Y5C1.png) ![image.png](//image.easyeda.com/pullimage/oX4oFwvH47CtW9X0iZTOaTeeNkQY73RyJEQOVugh.png) Not usre how you ended up with that but delete it and replace it like this: ![image.png](//image.easyeda.com/pullimage/eBRTumJgd3GYHDWWjtFIyljwqXEYozTFs8tRKu5L.png)
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palimpalim 4 years ago
Thank you so much! Can't believe I didn't see that. I corrected the drawing frame issue as well, guess that might have happened when copy pasting. Thanks again for taking your time!
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jscordero1 4 years ago
I am trying to do the same thing, can someone please tell me the steps to add another layer and connect them to nets?
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andyfierman 4 years ago
@jscordero1, This topic covers a number of issues. Please post you question as a new topic with a clear statement of what you would like hep with. Thanks.
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