What u need is high resolution to resolve tiny difference at input and high speed to accommodate to the sampling rate. 5 G' R$ g- L& Q8 w% g! o, kSo you need to use comparator making of preamplifiers+latch. Preamplifier has negative exponential response and can amplify the small delta_vin to bigger output which will be developed to Voh thanks to the positive exponential response of the latch. 9 C3 f+ m% A8 i+ q0 ~, u
And you may need several stages of preamplifiers with high bandwidth ones for initial stages.
What u need is high resolution to resolve tiny difference at input and high speed to accommodate to the sampling rate. % g% W9 K% Q. w$ z8 e8 \4 e$ W/ kSo you need to use comparator making of preamplifiers+latch. Preamplifier has negative exponential response and can amplify the small delta_vin to bigger output which will be developed to Voh thanks to the positive exponential response of the latch. 3 Z' l5 X. I: B+ q; r- `# HAnd you may need several stages of preamplifiers with high bandwidth ones for initial stages.