AD/DA conversion

What type of filter is used as the anti-aliasing filter placed before an AD converter?

  1. AHigh-pass filter
  2. BBand-stop filter
  3. CLow-pass filter
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Answer: C. Low-pass filter

If components above half the sampling frequency (the Nyquist frequency) reach the ADC, they fold back into false low-frequency signals. To prevent this, a low-pass filter is placed before the ADC to remove components above the Nyquist frequency.

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More AD/DA conversion questions

  1. Which is a characteristic of an R-2R ladder DA converter?
  2. What is the role of a sample-and-hold circuit placed before an AD converter?
  3. 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)
  4. Which is a characteristic of the dual-slope AD converter often used in digital multimeters?
  5. Which correctly describes the differential nonlinearity (DNL) of an AD converter?