I have created the 4 bit schematic, with a smaller value for Ain at the comparator input. It now only ranges from 0-1.2V, where the last bit seems to have issues.
For Ain=1.1, these are my results, which is not expected, since I should be getting 1110 instead of 1111:
For Ain=1.1, these are my results, which is not expected, since I should be getting 1110 instead of 1111:
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