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Ground plane slit?

Discussion in 'Electronic Design' started by [email protected], Feb 13, 2009.

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  1. Guest

    I have an analog circuit (A-D and filter) that has to get placed
    relatively close to an FPGA (0.3" between the nearest points on the
    FPGA to the closest component of the filter, generally about 1" for
    most parts). I'm concerned about picking up any noise from the digital
    stuff. My intuition tells me that (in the absence of a proper split
    plane, which isn't doable in this case) it would be useful to put a
    slit in the ground planes between the filter and the fpga.

    Any opinions? Alternatives (can't move either block)?


  2. MooseFET

    MooseFET Guest

    I you are doing an FPGA, it is likely that you have many layers in the
    board. This can let you put an extra ground plane in the board under
    the analog on the comp-side buried trace layer.

    Something like this

    Analog Digital

    Comp copper Comp copper
    Analog Ground Traces
    Ground Ground
    Analog power traces
    Analog ground traces
    Vcc Vcc
    analog ground traces
    solder copper solder copper
  3. Guest

    to the OP

    read all of HJ's books on black magic...the answer is in there..

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