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I) A large no.of comparator are required to be used. For the 2 bit ADC , 3 comparators are used a 3 bit requires 7 comparators and 4-bit requires 15 comparators
n bit requires 2$^{n-1}$ comparators
No of comparators required almost doubles for each addded bit
iii) with increased no.of bits ānā the priority encoder becomes increasingly complex