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Newbie ground/power plane question

autodeskguest

I  notice on some people's boards that only traces and fiberglass are

visible, while on others, instead of the fiberglass, there's copper

everywhere, except for a small insulating gap between the copper and the

traces.  I assume these copper areas are "pours" and, on 2-layer boards, are

a power plane on one side and ground plane on the other.  Do I have that

right?

 

If so, how do you lay out your board in Eagle so that the autorouter can

rout your traces and create a single, contiguous pour on each side of the

board?

 

Thanks.

 

Karl

 

 

 

  • Karl Lautman wrote:

    I  notice on some people's boards that only traces and fiberglass are

    visible, while on others, instead of the fiberglass, there's copper

    everywhere, except for a small insulating gap between the copper and the

    traces.  I assume these copper areas are "pours" and, on 2-layer boards, are

    a power plane on one side and ground plane on the other.  Do I have that

    right?

     

    If so, how do you lay out your board in Eagle so that the autorouter can

    rout your traces and create a single, contiguous pour on each side of the

    board?

     

    Thanks.

     

    Karl

     

     

    The usual technique is to rout your board then draw a polygon (use the

    "polygon" tool) around the area you want the copper pour to occupy. Then

    connect the polygon to the appropriate net by naming it the same as, for

    instance the ground traces . When you do that the polygon will fill and

    show you where it goes. If there are isolated bits of the polygon, you

    may have to add some sort of trace to connect them.

    John G.