Extra exam question E7E10
Subelement E7, PRACTICAL CIRCUITS· Group E7E
How does a diode envelope detector function?
- A.By rectification and filtering of RF signals (correct answer)
- B.By breakdown of the Zener voltage
- C.By mixing signals with noise in the transition region of the diode
- D.By sensing the change of reactance in the diode with respect to frequency
WhyA diode envelope detector functions by rectification and filtering of RF signals. A diode envelope detector works by rectifying the RF signal (passing current only on one half of each RF cycle) and then filtering that rectified output to smooth it into a waveform that traces the original signal's amplitude envelope, recovering AM-type modulation, answer A. It doesn't rely on Zener breakdown, doesn't mix signals with noise in a transition region, and doesn't sense reactance changes with frequency, those describe entirely different detection mechanisms.
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.
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