AdvancedA-002-011-001
What is a crystal lattice filter?
D
Answer
Circuit design and power supplies
Type
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 with wide bandwidth and shallow skirts made using quartz crystals
D
A filter with narrow bandwidth and steep skirts made using quartz crystals
Answer Notes
A crystal lattice filter is an electronic RF filter that utilizes quartz crystals arranged in a lattice or bridge configuration. Because quartz crystals possess a mechanical resonance with an extremely high Q-factor (quality factor), they can filter radio frequencies with immense precision.
Thanks to this high Q-factor, crystal lattice filters are prized for providing a very narrow bandwidth along with steep "skirts" (meaning the filter's frequency response drops off very sharply outside the desired passband). They are extensively used in high-quality receivers to block adjacent channel interference, particularly in single sideband (SSB) and CW modes.
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What factor determines the bandwidth and response shape of a crystal lattice filter?