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The quantisation error of a converter is at most

  • A.half of one least significant bit
  • B.one least significant bit
  • C.two least significant bits
  • D.zero

Answer: A

Rounding to the nearest level puts the true value at most half a step away from the number reported. That half bit is irreducible and independent of the quality of the reference or the amplifier, so it is the ultimate limit of a converter of that resolution.

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