In most of ADCs (for instabce AD9600) you can use an external reference voltage (Vref) My question is how samll can this Vref be?
For exampl in a GPS receiver you have to put a lot if GAIN in IF (>40dB). If I could work with very low Vref for the ADC (say 0.05v), then I can get rid of a lot of gain prior to the ADC. Is this feasible/possible?
If yes, how am I going to obtain a clean and stable 0.05v reference voltage source?