What is a Crystal filter?

A crystal filter is a filter that uses a crystal oscillator. Crystal filters are mainly used as bandpass filters to extract the required frequency components. Since crystal oscillators have a high Q and exhibit steep pass characteristics, crystal filters are effectively used to selectively extract frequencies. Similar to crystal filters, SAW filters are also used because they can extract the required frequency components. A SAW filter is a filter that selectively extracts specific frequencies by forming comb-shaped electrodes with a metal film on a substrate.

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