crystal filter的意思|示意

'

Crystals filters are electronic filters used in radio and telecommunications to filter out interference and noise in a signal. Crystals filters are used for both transmitting and receiving and can be used in AM and FM broadcast radios, satellite and mobile communications, medical imaging, and other applications involving communications, radar, and navigation.

Crystal filters are built using quartz crystals. Quartz crystals are piezoelectric, meaning they vibrate when a voltage is applied. This vibration is used to create filter responses with steep skirts, making them very efficient in removing noise and interference.

Crystal filters are similar in operation to other filters, such as low-pass, high-pass, Band-pass and band-stop (notch) filters. The crystal can be tuned to provide the desired filter frequency and bandwidth. The performance of the filter depends on the type of crystal. The type of crystal used in a filter determines the frequency range and passband shape.

The main advantages of crystal filters are their high selectivity and wide passband; they can also be tuned to operate at narrow frequencies and are inexpensive. However, the main disadvantage of crystal filters is that they are not as adjustable as other types of filters. This makes them difficult to tune and can cause problems with frequency stability.

In summary, crystal filters are used in radio and telecommunications applications to filter out interference and noise. They are built using quartz crystals and provide high selectivity and wide passband. However, they are not as adjustable as other types of filters, making them difficult to tune and causing issues with frequency stability.