How many comparators are used in a 4-bit flash Analog-to-Digital Converter (ADC)?

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BDL MT Electrical 17 April 2022 Official Paper
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  1. 4
  2. 5
  3. 15
  4. 16

Answer (Detailed Solution Below)

Option 3 : 15
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The correct answer is option 3):(15)

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) = 4

Number of comparators required = 24 -1 = 15

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