![]() They are preferred because they are very stable mechanically and thus have little change in resonant frequency with changes in operating temperature. Crystal filters are commonly used in communication devices such as radio receivers.Ĭrystal filters are used in the intermediate frequency (IF) stages of high-quality radio receivers. ![]() Typical crystal filter attenuation in the band-pass is approximately 2-3 dB. The crystal's stability and its high Q factor allow crystal filters to have precise center frequencies and steep band-pass characteristics. In particular, quartz crystals can exhibit mechanical resonances with a very high Q factor (from 10,000 to 100,000 and greater - far higher than conventional resonators built from inductors and capacitors). Quartz crystals are piezoelectric, so their mechanical characteristics can affect electronic circuits ( see mechanical filter). ![]() An electronic filter can use quartz crystals as resonator components of a filter circuit. A 9 MHz crystal ladder filter with four matched crystals.Ī crystal filter allows some frequencies to 'pass' through an electrical circuit while attenuating undesired frequencies.
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