Which ADC type is known for its high speed but relatively lower resolution?

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RRB JE CBT 2 (Electronics Engineering) ReExam Official Paper (Held On: 04 Jun, 2025)
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  1. Flash ADC
  2. Sigma-Delta ADC
  3. Successive Approximation ADC
  4. Dual-Slope ADC

Answer (Detailed Solution Below)

Option 1 : Flash ADC
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Detailed Solution

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The correct answer is option 1

Explanation:

1) Flash ADC

  • Fastest ADC type.

  • Uses a parallel bank of comparators to convert input voltage in a single step.

  • Trade-off: very fast but limited resolution (typically 8 bits or less), because the number of comparators doubles with each bit of resolution.

2) Sigma-Delta ADC

  • Very high resolution, but slow, because it oversamples and averages.

3) Successive Approximation ADC (SAR)

  • Medium speed, medium resolution.

  • Not as fast as Flash ADC, but higher resolution.

4) Dual-Slope ADC

  • Very high resolution, but slowest.

  • Typically used in digital multimeters.

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