I mean the ic work in multiple supply power.
If the common mode voltage is fixed voltage, it wil not fit for the power supply variation.
But if the common mode voltage is variable (like the vdd/2), i want to know how to generator. I think the
resistor divider is not fit for it , as the power supply is interfered by the noist spike of digital part.
On the other hand , the vdd/2 may be not the best selection for the SNR and DR. I want to know whether there are other ways for suring the performance with the varing power supply.