I'm experimenting with this AD design. It's clear why we are using RLD here but why do we tap at the gain resistors for the CMV signal and why do we use 10x amplification here? As far as I know CMV value can be volts so such amplification would saturate the driver opamp. In other designs the electrode signals were first buffered then averaged before inverting. It's not quite clear what signal we get tapping at the gain resistors of the inamp. Thank you in advance.