What is a crystal lattice filter?

A crystal lattice filter uses multiple quartz crystals arranged in a bridge or lattice circuit network. This configuration achieves very steep, narrow band-pass filtering, which is highly desirable in the intermediate frequency (IF) stages of a receiver to isolate a single signal. These filters are specifically designed for low-level signals because high-level RF power can physically fracture the delicate quartz crystals or cause severe distortion. The distractors are incorrect because crystals are never used for power supply filtering, and the term "lattice" refers to the circuit's electrical wiring topology, not the physical shape of the crystals themselves.