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shorting of analog and digital grounds

Discussion in 'Electronic Components' started by anshu, Jan 24, 2006.

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  1. anshu

    anshu Guest

    presently i am working on mixed signal design ,i want to know wich
    component is recommended for shorting analog and digital grounds
    2)zero ohm resistor
    3) diode (schottky)
  2. Pipo

    Pipo Guest

    Shorting grounds? You mean where to connect the grounds?

    This depends on your current paths. Normally I would expect grounds to
    be connected at the power supply. Just connected, no diode, normally
    no inductor too. The inductor is sometimes used to prevent emc into
    the analog parts. But you have to be careful as it may even make
    things worse. The analog and digital part are like 2 independend
    systems, the are connected at the ground.

    It ususally is important that digital currents do not flow through the
    analog ground (and the other way around). That current would lead to
    fluctuations of the ground, and when you do not have a balanced system
    you use the ground as reference.

    Take care at the point where you do the AD conversion. Use a convertor
    with balanced inputs and connect the '-' input to the analog ground,
    NOT the digital ground. When the convertor has only one input and uses
    the GND itself as 0-reference, then this will be the point where the 2
    grounds connect. Make sure nu digital currents flow through it.

    It is not possible to give better info without seeing the schematics
    or setup first. Or without knowing what you want to do: preventing
    disturbances caused by digital currents into the analog part, or
    preventing spikes etc coming from cables from the analog part into the
    digital part.

    Pieter Hoeben
  3. anshu

    anshu Guest

    thanks for info .i can give u some brief idea abt my design
    i am having and adc working at 65Mhz the sampled data is going to
    FPGA(vertix2) .
  4. Quitus

    Quitus Guest

  5. anshu

    anshu Guest

    thanks for the link
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