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EAGLE User Support (English) how to define non-signal (ground) layer in v7.2
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  • signal
  • 7.2
  • plane
  • non
  • ground
  • layer
Related

how to define non-signal (ground) layer in v7.2

Former Member
Former Member over 10 years ago

Using the standard version, with a top/bottom and 3 other routing inner layers, a very split power plane layer, how do I define a non-signal inner ground layer that can be polygon poured and get anti-pads around non-ground signal vias during ratsnest?

Stackup will be with only 6 signal layers (if you count the power plane):

1) Top with SMT, low frequency traces, and some high speed routing traces

2) desired inner ground layer

3) inner low frequency routing layer

4) Power plane

5) a 2nd copy of the inner ground layer

6) inner high frequency routing layer

7) inner high frequency routing layer

8) Bottom with SMT components...

Note that I'm going to be using TH vias rather than buried or blind vias, as well as some TH connectors

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  • autodeskguest
    0 autodeskguest over 10 years ago in reply to Former Member

    Bruce Mellen wrote on Thu, 30 April 2015 18:45

    I apparently misinterpreted, but Eagle could have been (or be)

    implemented as such:  Not allowing routing of signals on layers other

    than 6 chosen would effectively limit the software to 6 signal layers and

    additional desired supply layers (poured power and ground planes) that

    one can afford to have manufactured.

     

    So, if you can afford to have these kinds of multi-layer boards

    manufactured, it would seem to me you could afford the ~$800 to upgrade to

    the Professional version of EAGLE...

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

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  • Former Member
    0 Former Member over 10 years ago in reply to autodeskguest

    Sadly not.  Perhaps someday with more experience and time, but it is just my very part time semi-retirement hobby that I'm getting into at this point, and a further upgrade is substantially beyond my budget.  I need what funds I have to prototype my experiments.  My experiments/prototypes will now have to experience the consequences of a lack of a pair of ground planes that would have been coupled to high speed routing layers and the power plane in the originally proposed question stackup.  From my reading, an 8 layer board is the first one that can do high speed routing and coupling correctly, while limiting EMI.

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  • autodeskguest
    0 autodeskguest over 10 years ago in reply to Former Member

    Bruce Mellen prodded the keyboard with:

     

    From my reading, an 8 layer board is the

    first one that can do high speed routing and coupling correctly,

    while limiting EMI.

     

    Prior to retirement, I used to happily use three and four layer boards

    at 10 Ghz.

     

    --

    Best Regards:

                          Baron.

     

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  • Former Member
    0 Former Member over 10 years ago in reply to autodeskguest

    My present ambitious goal involves a 1mm pitch 484 ball BGA, ddr3, and some high speed connectors to other  2/4 layer boards that do other things.  I feel the need to minimize all noise possible, given connectors to other things.

     

    Are you still doing anything related - just for fun?

    Feel free to contact me directly if more curious.

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  • autodeskguest
    0 autodeskguest over 10 years ago in reply to Former Member

    Bruce Mellen prodded the keyboard with:

     

    My present ambitious goal involves a 1mm pitch 484 ball BGA, ddr3,

    and some high speed connectors to other  2/4 layer boards that do

    other things.  I feel the need to minimize all noise possible, given

    connectors to other things.

     

    With those sort of high density bga you might struggle with 6 layers.

    Crosstalk could also be an issue.

     

    Are you still doing anything related - just for fun?

    Feel free to contact me directly if more curious.

     

    No. I'm much happier not having to think about circuit design

    nowadays.  Wandering around europe is far nicer image

    Thanks for the invite anyway.

     

    --

    To view any images and attachments in this post, visit:

    http://www.element14.com/community/message/148665

     

    --

    Best Regards:

                          Baron.

     

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