Extra exam question E7H11
Subelement E7, PRACTICAL CIRCUITS· Group E7H
What are the major spectral impurity components of direct digital synthesizers?
- A.Broadband noise
- B.Digital conversion noise
- C.Spurious signals at discrete frequencies (correct answer)
- D.Harmonics of the local oscillator
WhyThe major spectral impurity components of direct digital synthesizers are spurious signals at discrete frequencies. The major spectral impurities in a direct digital synthesizer's output are spurious signals appearing at specific, discrete frequencies, artifacts of the digital synthesis and DAC conversion process rather than a smooth, continuous noise floor, answer C. Broadband noise, generic "digital conversion noise," and local oscillator harmonics don't describe the characteristic discrete-frequency spurs a DDS is known for.
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.