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Analog and Digital Ground connection

David G

Hi,

 does anyone know how to represent in capture CIS, when you need a digital and an analog GND to connect

on only one point, if I tie both grounds using a wire then orcad makes a short and I lose one of the nets

what I have been doing so far is to just draw a line between both GNDs and on Allegro use the short_net properti

but was wondering if there is a better, or correct = ) way to do this?

 thank you 

  • Khurana

     I don't think this is possible in the schematic tool since "one point" will mean "all points" if two nets are shorted i.e. one net (name) always takes over when the nets are shorted or if two nets with different net names are joined, then check yields an error and therefore netlist cannot be generated.

  • elcokev

    what I do is have a symbol with 2 connections and a foot print with 2 small touching pads this then allows 2 signals to joint at one point.

    hope this helps.

     

    best regards

     elcokev

  • Tanveer

     

    Connect them with zero Ohm resistor.

    Regards

    Tanveer

  • bono

           I have met the problem also, and find the answer on this page.   That's the zero resisitor and "touched" pad.                                       I am  glad to introduce another method,  called "touched" shape.       Say two shapes for digital and analog ground, created as dynamic positive shape , after you finish most layout jobs, first change these two shapes to static shapes , then at the intended connection point,  put the third static shape touched the two adjacent ground shape, assign the shape net as one of them.  Now get two touched shapes.   though DRC error exists,  for the film result in fact the two ground shapes are connected.    

        Regards

        Bono                                      

  • ArturoArias
    I use a ferrite bead... 120 Ohm or higher, and depending on the space I have, I choose the footprint. Remember this: the bigger the footprint, the higher the impedance and the capacity of driving current. Regards. Arturo
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