AD/DA conversion

In a delta-sigma AD converter, which digital circuit converts the fast, coarse quantized output into high-resolution data at a lower sampling rate?

  1. ASample-and-hold circuit
  2. BDecimation filter
  3. CR-2R ladder
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Answer: B. Decimation filter

A delta-sigma modulator outputs a coarse signal, such as 1 bit, at a high sampling rate. The decimation filter averages that output with a digital low-pass filter, removing the quantization noise pushed to high frequencies, and lowers the sampling rate while producing high-resolution data.

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More AD/DA conversion questions

  1. What is the brief spike-like error that appears at the output of a DA converter at the moment the input code changes?
  2. Which architecture runs several AD converters alternately with slightly staggered timing to achieve a high overall sampling rate?
  3. What is the main reason for placing a driver circuit, such as an op-amp, in front of a successive-approximation AD converter?
  4. Which architecture is used as the internal DAC in many successive-approximation AD converters?
  5. Which is a characteristic of a resistor-string DAC, which connects many resistors in series?