Can I calculate the CMRR of a board?
If yes how?
Usually CMRR refers to a single amplifier not a board (IMHO)
For example I have a board with amplifier chain (4 different amplifiers):
According the datasheets the CMRR range is 80-150 and it dipends from frequency temperature, amplifier.
Can i calculate a unique value for the board?
No.
You can only measure the CMRR for a specific piece of hardware, because there are many parameters you do not know, like the exact CMRR of the amplifiers, and the leakage characteristics of the board. This will change with board layout and PCB material.
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