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Autodesk EAGLE
EAGLE User Chat (English) Creating a ground plane
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Related

Creating a ground plane

autodeskguest
autodeskguest over 15 years ago

I have finished creating the board layout except all the GND wires.

What I want is that all the free place on the board will be part of the GND

ground plane.

How should I do that?

 

Harry

 

 

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  • autodeskguest
    autodeskguest over 15 years ago

    "Harry H. Arends" <info@time-tech.eu> wrote in message

    news:hj9ail$3p3$1@cheetah.cadsoft.de...

    I have finished creating the board layout except all the GND wires.

    What I want is that all the free place on the board will be part of the

    GND ground plane.

    How should I do that?

     

    Draw a polygon around the edges of the board. Then name it "gnd". Press

    ratsnest to fill it.

     

     

     

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  • autodeskguest
    autodeskguest over 15 years ago

     

    "Morten Leikvoll" <mleikvol@yahoo.nospam> schreef in bericht

    news:hj9b64$6ef$1@cheetah.cadsoft.de...

    "Harry H. Arends" <info@time-tech.eu> wrote in message

    news:hj9ail$3p3$1@cheetah.cadsoft.de...

    I have finished creating the board layout except all the GND wires.

    What I want is that all the free place on the board will be part of the

    GND ground plane.

    How should I do that?

     

    Draw a polygon around the edges of the board. Then name it "gnd". Press

    ratsnest to fill it.

     

    That works, but where do I determinate the distance between the polygon and

    its surrounding tracks and pads.

    If I draw a polygon around text will it leave that area not filled?

     

     

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  • autodeskguest
    autodeskguest over 15 years ago

     

    "Harry H. Arends" <info@time-tech.eu> wrote in message

    news:hj9dsa$hon$1@cheetah.cadsoft.de...

    That works, but where do I determinate the distance between the polygon

    and its surrounding tracks and pads.

    If I draw a polygon around text will it leave that area not filled?

     

    Global settings is in the DRC window (clearance tab, wire-via/ wire-wire

    number (Polygon is a wire-fill)). Rerun ratsnest after changing DRC

    settings.

    If you need a bigger clearance for a single polygon, look in the polygon

    properties. Here you can select isolate, but it has to be greater than DRC

    clearance setting, orelse DRC settings will be used.

    Read help/manual a bit on polygons. There are other issues you need to know

    about if you have overlapping polygons, and wire width of polygons also

    matter in how it is filled.

     

     

     

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  • autodeskguest
    autodeskguest over 15 years ago

    "Morten Leikvoll" <mleikvol@yahoo.nospam> schreef in bericht

    news:hj9ial$81r$1@cheetah.cadsoft.de...

     

    "Harry H. Arends" <info@time-tech.eu> wrote in message

    news:hj9dsa$hon$1@cheetah.cadsoft.de...

    That works, but where do I determinate the distance between the polygon

    and its surrounding tracks and pads.

    If I draw a polygon around text will it leave that area not filled?

     

    Global settings is in the DRC window (clearance tab, wire-via/ wire-wire

    number (Polygon is a wire-fill)). Rerun ratsnest after changing DRC

    settings.

    If you need a bigger clearance for a single polygon, look in the polygon

    properties. Here you can select isolate, but it has to be greater than DRC

    clearance setting, orelse DRC settings will be used.

    Read help/manual a bit on polygons. There are other issues you need to

    know about if you have overlapping polygons, and wire width of polygons

    also matter in how it is filled.

     

    Next problem, I have text on the bottom where the ground plane should come.

    How can I create a clear rectangle around that text. If I create a poly

    around the board the text is still there but completely enclosed.

     

     

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  • autodeskguest
    autodeskguest over 15 years ago

    Harry H. Arends wrote:

    "Morten Leikvoll" <mleikvol@yahoo.nospam> schreef in bericht

    news:hj9ial$81r$1@cheetah.cadsoft.de...

     

    "Harry H. Arends" <info@time-tech.eu> wrote in message

    news:hj9dsa$hon$1@cheetah.cadsoft.de...

    That works, but where do I determinate the distance between the

    polygon and its surrounding tracks and pads.

    If I draw a polygon around text will it leave that area not filled?

     

    Global settings is in the DRC window (clearance tab, wire-via/

    wire-wire number (Polygon is a wire-fill)). Rerun ratsnest after

    changing DRC settings.

    If you need a bigger clearance for a single polygon, look in the

    polygon properties. Here you can select isolate, but it has to be

    greater than DRC clearance setting, orelse DRC settings will be used.

    Read help/manual a bit on polygons. There are other issues you need to

    know about if you have overlapping polygons, and wire width of

    polygons also matter in how it is filled.

     

    Next problem, I have text on the bottom where the ground plane should come.

    How can I create a clear rectangle around that text. If I create a poly

    around the board the text is still there but completely enclosed.

     

    It depends on what layer you put the text in and how your CAM job

    outputs.    If the layer that the text is in is output as part of the

    bottom silkscreen then it will not interfere w/ the pour since the

    silkscreen will be printed on top of the metalization.

     

    If you are trying to put text into the same layer as the ground pour

    then the letters in the text will automatically be isolated from the

    plane just like vias, pads, etc.

     

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  • dukepro
    dukepro over 15 years ago

    On 01/21/2010 10:39 AM, Jim Littlefield wrote:

    Harry H. Arends wrote:

    "Morten Leikvoll" <mleikvol@yahoo.nospam> schreef in bericht

    news:hj9ial$81r$1@cheetah.cadsoft.de...

     

    Next problem, I have text on the bottom where the ground plane should

    come.

    How can I create a clear rectangle around that text. If I create a

    poly around the board the text is still there but completely enclosed.

     

    It depends on what layer you put the text in and how your CAM job

    outputs.    If the layer that the text is in is output as part of the

    bottom silkscreen then it will not interfere w/ the pour since the

    silkscreen will be printed on top of the metalization.

     

    If you are trying to put text into the same layer as the ground pour

    then the letters in the text will automatically be isolated from the

    plane just like vias, pads, etc.

     

    If you want a nice rectangle around the text, you can draw draw a

    rectangle on the bRestrict layer that encloses the area occupied by the

    text to prevent the copper pour from filling that area.  This will

    produce DRC errors since the text itself is within the bRestrict area.

    Once these errors are marked as approved DRC will not bother you again.

     

    Enjoy,

        - Chuck

     

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  • autodeskguest
    autodeskguest over 15 years ago

    or you can put the letters (vector font) into the bRestrict layer and

    they will be copper free in the poly.

     

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  • autodeskguest
    autodeskguest over 15 years ago

    "Harry H. Arends" <info@time-tech.eu> wrote in message

    news:hj9s3i$s5g$1@cheetah.cadsoft.de...

    Next problem, I have text on the bottom where the ground plane should

    come.

    How can I create a clear rectangle around that text. If I create a poly

    around the board the text is still there but completely enclosed.

     

    This is a bit different from porpotional fonts and vector fonts.

    Propotional fonts seem to make a nice square window, but that only shows up

    if you print (not plot) the layer.

    Vector fonts does add spacing around the text, but not in a window. You can

    draw a square (using wires) in the restrict layer close around the text. You

    may get fills inside it if the window is much bigger than the text and

    orhphans=on on the polygon. Play with it a bit and do ratsnest each time to

    change something.

     

     

     

     

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  • autodeskguest
    autodeskguest over 15 years ago

     

    "Morten Leikvoll" <mleikvol@yahoo.nospam> schreef in bericht

    news:hjc7bi$baa$1@cheetah.cadsoft.de...

    "Harry H. Arends" <info@time-tech.eu> wrote in message

    news:hj9s3i$s5g$1@cheetah.cadsoft.de...

    Next problem, I have text on the bottom where the ground plane should

    come.

    How can I create a clear rectangle around that text. If I create a poly

    around the board the text is still there but completely enclosed.

     

    This is a bit different from porpotional fonts and vector fonts.

    Propotional fonts seem to make a nice square window, but that only shows

    up if you print (not plot) the layer.

    Vector fonts does add spacing around the text, but not in a window. You

    can draw a square (using wires) in the restrict layer close around the

    text. You may get fills inside it if the window is much bigger than the

    text and orhphans=on on the polygon. Play with it a bit and do ratsnest

    each time to change something.

     

    Solved the problem by placing a restrict on the text that is slightly

    smaller.

    After a ratnest it places a nice square around the text.

     

     

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