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Which of the following is the fastest A-D converter?
  • a)
    Successive approximation type
  • b)
    Flash type
  • c)
    Integration type
  • d)
    Ramp type
Correct answer is option 'B'. Can you explain this answer?
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Which of the following is the fastest A-D converter?a)Successive appro...
Concept:
Flash ADC (Fastest)
  • The flash ADC is the fastest type available. A flash ADC uses comparators, one per voltage step, and a string of resistors.
  • Flash-type ADC requires no counter For an n-bit ADC, flash-type ADC requires (2n – 1) comparators
  • A 4-bit ADC will have 15 comparators, and an 8-bit ADC will have 255 comparators.
  • The following figure shows a 3-bit flash ADC circuit.
  • It is formed of a series of comparators, each one comparing the input signal to a unique reference voltage.
  • The comparator outputs connect to the inputs of a priority encoder circuit, which then produces a binary output.
  • Vref is a stable reference voltage provided by a precision voltage regulator as part of the converter circuit.
  • As the analog input voltage exceeds the reference voltage at each comparator, the comparator outputs will sequentially saturate to a high state.
  • The priority encoder generates a binary number based on the highest-order active input, ignoring all other active inputs.
Additional Information
  • The successive approximation A/D converter has a shorter conversion time compared to the counter ramp A/D converter.
  • Counter type ADC and successive approximate ADC use DAC Counter type ADC uses linear search and successive approximation type ADC uses binary search
  • A ring counter is used in successive approximation-type ADC
  •  Dual slope ADC is the most accurate
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Which of the following is the fastest A-D converter?a)Successive approximation typeb)Flash typec)Integration typed)Ramp typeCorrect answer is option 'B'. Can you explain this answer?
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