Consider the following circuit with a fully-differential amplifier (incorporating internal common-mode feedback) driving a perfect bipolar analog-to-digital converter (ADC). The ADC has bits.

The ADC operates with an input differential signal (as indicated in the figure) in all the dynamic range, i.e. the range of its power-supply from to , with . It also allows common-mode voltages within this range, but each signal and must be limited to this input range.

The differential signal is obtained from a sinusoidal voltage according to the gain that provides .

Assuming , obtain the signal-to-noise ratio, SNR(dB), at output of the converter.

Note: The ADC input filter circuitry only removes unwanted high-frequency noise, it does not affect the input signal.