Extra exam question E8A10
Subelement E8, SIGNALS AND EMISSIONS· Group E8A
What is the purpose of a low-pass filter used at the output of a digital-to-analog converter?
- A.Lower the input bandwidth to increase the effective resolution
- B.Improve accuracy by removing out-of-sequence codes from the input
- C.Remove spurious sampling artifacts from the output signal (correct answer)
- D.All these choices are correct
WhyA low-pass filter at the output of a digital-to-analog converter removes spurious sampling artifacts from the output signal. A low-pass filter at a digital-to-analog converter's output removes spurious sampling artifacts, the stair-step and image-frequency content left over from the discrete, stepped nature of the DAC's output, smoothing it back into a clean analog waveform, answer C. It doesn't lower input bandwidth to boost resolution, and it doesn't remove out-of-sequence codes, those aren't functions a passive output filter performs.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- E8A01What technique shows that a square wave is made up of a sine wave and its odd harmonics?
- E8A02Which of the following is a type of analog-to-digital conversion?
- E8A03Which of the following describes a signal in the time domain?
- E8A04What is “dither” with respect to analog-to-digital converters?
- E8A05What is the benefit of making voltage measurements with a true-RMS calculating meter?