i had 2 separate designs so far for the front-end. one of the design considerations was i needed variable gain to accomodate different voltage input ranges from 0-150V. my first design used a simple voltage divider to divide the input by 30, then the variable inamp would raise it to a +/-5V reference. that way, i also get a 10M input impedance which i was looking forward to. the inamp was made with TC913 op-amps. the second design had variable division voltage divider at the front, and a fixed gain=1 inamp, the INA217. I'm not familiar with noise analysis calculations, could you give me some insight to that? Currently, the prototype and testing is being done on breadboard with decoupling of 10u electrolytic with .1u mylar at each power supply. what is the purpose of the anti-aliasing filter? let me know if you need to know more about the parts chosen or values