Extra exam question E7C09
Subelement E7, PRACTICAL CIRCUITS· Group E7C
What is a crystal lattice filter?
- A.A power supply filter made with interlaced quartz crystals
- B.An audio filter made with four quartz crystals that resonate at 1 kHz intervals
- C.A filter using lattice-shaped quartz crystals for high-Q performance
- D.A filter for low-level signals made using quartz crystals (correct answer)
WhyA crystal lattice filter is a filter for low-level signals made using quartz crystals. A crystal lattice filter uses quartz crystals arranged to create a sharp, high-Q band-pass filter specifically suited for filtering low-level signals, commonly used in a receiver's IF stage, answer D. It isn't a power supply filter, isn't specifically an audio filter built from crystals resonating at fixed 1 kHz intervals, and while it does use a lattice-style arrangement, describing it just as "lattice-shaped crystals" misses that its actual defining purpose is filtering low-level IF signals.
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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