On flash A/D-converters with low-precision comparators

Flash analog-to-digital converters can be built using small (and fast) low-precision comparators with unpredictable thresholds followed by a digital look-up table to correct the output. The look-up table should store digital codes with higher precision than the nominal resolution of the converter. The effective resolution of such a scheme with N comparators is roughly log₂(N) - 1 bits. The concept is demonstrated by a chip that achieves almost 7 bit resolution with 256 low-precision comparators