AD/DA conversion

Which is a characteristic of an R-2R ladder DA converter?

  1. AIt can be built with only two resistor values (R and 2R), so few resistor values are needed
  2. BIt is built only from capacitors
  3. CIt switches current using inductors
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Answer: A. It can be built with only two resistor values (R and 2R), so few resistor values are needed

An R-2R ladder combines resistors R and 2R in a ladder to produce currents or voltages weighted according to each bit. Even as the number of bits increases, only two resistor values are needed, and it is easy to match the accuracy of resistor ratios.

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More AD/DA conversion questions

  1. What is the role of a sample-and-hold circuit placed before an AD converter?
  2. 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)
  3. Which is a characteristic of the dual-slope AD converter often used in digital multimeters?
  4. Which correctly describes the differential nonlinearity (DNL) of an AD converter?
  5. What is the AD converter defect called in which a certain output code never appears no matter how the input changes?