Analog inputs are converted to digital outputs using op-amps as comparators. Assuming a 5-bit digital output, the number of comparators required would be

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ESE Electronics 2012 Paper 1: Official Paper

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Answer 1

Concept:

Flash Type ADC:

1) It is the fastest ADC among all the ADC types.

2) An n-bit flash type ADC requires:

2n -1 comparators, 2n resistors, and one 2n × n priority encoder.

Analysis:

Number of bits(n) = 5

Number of comparators required = 2n -1 = 31