AD/DA conversion

In the transfer characteristic of an AD converter, what is the error called when the output deviates from 0 at zero input?

  1. AOffset error
  2. BGain error
  3. CDifferential nonlinearity
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Answer: A. Offset error

Offset error is a parallel shift of the whole transfer characteristic, appearing as an output deviation at zero input. Error in the slope is called gain error. Both can usually be corrected by calibration.

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More AD/DA conversion questions

  1. What is an advantage of using a differential input for an AD converter?
  2. In a delta-sigma AD converter, which digital circuit converts the fast, coarse quantized output into high-resolution data at a lower sampling rate?
  3. What is the brief spike-like error that appears at the output of a DA converter at the moment the input code changes?
  4. Which architecture runs several AD converters alternately with slightly staggered timing to achieve a high overall sampling rate?
  5. What is the main reason for placing a driver circuit, such as an op-amp, in front of a successive-approximation AD converter?