Verifying first PCB design

Discussion in 'The Projects Forum' started by eb123, Jul 31, 2018.

  1. eb123

    Thread Starter Member

    Jul 3, 2017
    74
    2
    So, the pins are automatically isolated from GND? Do the parameters set in the net classes only apply to autorouting? Will I have to re-trace everything?
     
  2. eb123

    Thread Starter Member

    Jul 3, 2017
    74
    2
    Here are the top and bottom layers, re-routed using your parameters (all in mil). I've also going to scatter more vias around the board, to get a better connection. I've noticed that large parts of the board are unfilled (appear blue), but I'm going to assume that's fine and just the clearance setting.

    What parameters do you recommend for vias? I assume they don't need any clearance if they are connecting grounds?
     
  3. SLK001

    Senior Member

    Nov 29, 2011
    1,179
    439
    For signal integrity, always make efforts to flood ground between adjacent signals. You can do this with a ground via between them, or moving the traces farther apart. When I place vias, I will set them in a pattern, like 0.25" apart, with adjacent rows offset by 0.125" (diagonal rows). There is no reason for this other than it looks good. I then will sprinkle in extra ground vias where they are needed. Every via that connects top gnd with bot gnd effectively lowers the impedance of your ground. As for clearance of your vias, they CAN sometimes violate your DRC rules. You have to examine each violation and check "OK" to allow the violation (it's usually a trivial violation).

    Your board looks pretty good now, and will look even better if you address the above concerns.

    You also need to uncheck THERMALS for your bottom layer.
     
  4. Colinbenton

    New Member

    Jul 19, 2018
    9
    0
    Do you have gerber viewer to have a brieft check ?
    The design seems good after correction .
     
  5. eb123

    Thread Starter Member

    Jul 3, 2017
    74
    2
    Thanks, I'll get those vias in. I've added one between the signals as you suggested, and it has filled in the area. Out of interest, why wasn't this already filled, like most areas of the board?
     
  6. SLK001

    Senior Member

    Nov 29, 2011
    1,179
    439
    There is a setting called "ORPHANS" that is checked off. An orphan is a part of a ground plane that isn't connected to any other part. Normally, you don't want the orphans.
     
  7. Kjeldgaard

    Member

    Apr 7, 2016
    295
    110
    I have seen the setting called "Dead Copper Removal".
     
  8. SLK001

    Senior Member

    Nov 29, 2011
    1,179
    439
    He's using Eagle. In my version (6.5) it is called ORPHANS.
     
  9. eb123

    Thread Starter Member

    Jul 3, 2017
    74
    2
    Thanks for you help! I'll post the finished layers, and Gerber files once I've finished the rest of the board. Cheers.
     
  10. Colinbenton

    New Member

    Jul 19, 2018
    9
    0
    Great, do you have any idea where you are going to order the PCBs then ?
    I recommend ALLPCB and PCBWAY, the price should be reasonable for your design.
     
  11. patrick stone

    New Member

    Aug 9, 2018
    1
    0
    PCBWAY seems bigger than ALLPCB, and the price is quite different for these two fab.
     
  12. Colinbenton

    New Member

    Jul 19, 2018
    9
    0
    While, I enjoy the shipping discount from ALLPCB, and this is a very point I may consider for there are times of modifcation before we finalize our designs,and shipping cost is expensive for international business, At the same time ,the 24H lead time is attractive for me ,When I order on Monday, I got the tracking number on Tuesday, and receive them on weekend time ! I can test them and see if the boards perform well !
     
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