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Copper Pour Around Vias

therrm266

I'm trying to perform a copper pour around a via but it appears to be acting oddly.

image

I would expect the copper pour to wrap around the via, making a circle with a clearance set by my DRC options.

 

This becomes a bigger problem when getting a power pour under a BGA with vias; the hexagon shapes waste space.

image

 

Does anybody know why it is creating a hexagon shape instead? I have tried adjusting my DRC, changing width of poly, and some other options, but I haven't had any luck.

 

Any suggestions would be greatly appreciated!

 

Thanks!

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  • 0

    Hi,

    ...

    after rereading:

    are the shapes all with round ending switched on, or rectangle?

    Your image seems that they have rectangle ending.

    image

     

    ---

     

     

     

    Hi,

    It seems that something happens in the layers, e.g. keepout, restrict, 1-16; something invisible that makes this shape.

    Cadsoft liked all in octagonal shapes. Your image shows octagonal shapes, not hexagonal.image

     

    image

    I've changed the pad shape of the resistor for you to round (it comes from the standard rcl.lbr with octagon shape)

    Thus, the roundness of the copper pour is also "correct" calculated as almost rounded.

    Almost rounded because the calculator draws lines beside lines on grid or off grid. Then it can be happening of rounding errors.

    Look for the knee of N$1 - there is a typical rounding error on the pour of the inside arch.

    / This picture has some small spikes. This is because the image is a png file, a compressed image.

     

    Regards,

    Gerald

    ---

Reply
  • 0

    Hi,

    ...

    after rereading:

    are the shapes all with round ending switched on, or rectangle?

    Your image seems that they have rectangle ending.

    image

     

    ---

     

     

     

    Hi,

    It seems that something happens in the layers, e.g. keepout, restrict, 1-16; something invisible that makes this shape.

    Cadsoft liked all in octagonal shapes. Your image shows octagonal shapes, not hexagonal.image

     

    image

    I've changed the pad shape of the resistor for you to round (it comes from the standard rcl.lbr with octagon shape)

    Thus, the roundness of the copper pour is also "correct" calculated as almost rounded.

    Almost rounded because the calculator draws lines beside lines on grid or off grid. Then it can be happening of rounding errors.

    Look for the knee of N$1 - there is a typical rounding error on the pour of the inside arch.

    / This picture has some small spikes. This is because the image is a png file, a compressed image.

     

    Regards,

    Gerald

    ---

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