AD/DA conversion

Which is a characteristic of a delta-sigma (ΔΣ) AD converter?

  1. AIt readily achieves high resolution through oversampling and noise shaping
  2. BIt is the fastest of all architectures
  3. CIt requires 2ᴺ−1 comparators for N-bit conversion
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Answer: A. It readily achieves high resolution through oversampling and noise shaping

A delta-sigma converter samples at a frequency far higher than the signal band (oversampling), pushes quantization noise to high frequencies (noise shaping), and removes it with a digital filter. Because it achieves high resolution at low frequencies, it is used in audio and measurement applications.

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More AD/DA conversion questions

  1. For a 10-bit AD converter with a full-scale input of 1.024 V, what voltage corresponds to 1 LSB?
  2. What type of filter is used as the anti-aliasing filter placed before an AD converter?
  3. Which is a characteristic of an R-2R ladder DA converter?
  4. What is the role of a sample-and-hold circuit placed before an AD converter?
  5. Which is the approximate formula for the signal-to-noise ratio (SNR) of an ideal N-bit AD converter, set by quantization noise? (For a full-scale sine-wave input)