AGND and DVDD connection on pcb

mindisgodmindisgod
in Cyton
Hello there!

I have a question about one specific place on the pcb of OpenBCI. Here it is:

image

The green lines indicate AGND net and the blue one is for DVDD. I wonder, shouldn`t we connect these nets only through decoupling capacitors (as below on the picture)?

I think, we should, concerning the schematic. Or am I wrong?

Comments

  • biomurphbiomurph Brooklyn, NY
    It looks like you are referring to the skinny red line that is 'connecting' the DVDD and AGND.
    This line is an artifact in Design Spark. It defines the shape of the copper pour area, and it is not converted into the manufacturing output plot (gerber). Notice the line that is just above the ADS1299 pin row in your picture. This line is also not rendered in the gerbers.

  • mindisgodmindisgod
    I see, thanks! It`s really quite indistinct.

    But the AGND pour areas do have connection on 3 layer, don`t they?

    image


  • biomurphbiomurph Brooklyn, NY
    Yes. AGND is ground the board around!

    The 'separation' of the grounds is done in order to separate the analog and digital signals. However, the ground needs to be connected somewhere. It's called 'star grounding', where all of the different grounds (if there are more than two) are connected at one point.
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