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Digital ElectronicsADC & DAC

An n-bit flash ADC requires approximately how many comparators for direct quantization into 2^n levels?

  • An
  • B2n
  • C2^n - 1
  • D2^n + 1
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Correct Answer: C. 2^n - 1
Explanation: A conventional n-bit flash ADC uses one comparator for each decision threshold between adjacent output levels, giving 2^n − 1 comparators.
Reference: Standard digital electronics: flash ADC comparator count
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