1. The problem statement, all variables and given/known data A simplified model of ADC noise refers the noise to a noisy source resistance Rn while assuming the rest of the signal path to be noiseless. Figure 3 represents a particular 18-bit ADC that has a 10 V input voltage range. The ADC has a bandwidth of 1 MHz. Calculate the maximum value of Rn if the resolution of the ADC is not to be adversely affected by thermal noise. Assume the ADC operates at 25 degrees C. [N.b. The voltage resolution of an ADC is equal to its overall voltage measurement range divided by the number of discrete values possible on its output.] FIG. 3 2. Relevant equations 3. The attempt at a solution The issue of resolution has totally thrown me off but here is what I'm thinking. Rn = (Vn \ 4kTRB), where k is the Boltzmann constant. Vn = ? I'm not sure whether Vn = resolution or full scale voltage. It's all I got for now, please help!