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I have to design simple PCB that will measure current by shunt resistor(R7, R8, R9) and voltage by divider. Board has 3xin and 3xout for different voltage/current specifications. I have the following questions:

  1. Can I use the same signal GND for all inputs and outputs? For me it is obvious to use the same, but I see some other design, that I a little bit inspired by and there he separate GND of inputs from outputs.
  2. Should I create polygon of GND an top layer?
  3. Should I add some capacitors to current sensing tracks, beacause there are 3 pairs of current sensing traces and they go to header and goes to ADC on the other board.

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I attached pcb layout and altium files.

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