Difference between crystal filter vs ceramic filter basics
This page on crystal filter vs ceramic filter mentions basic difference between crystal filter and ceramic filter.
The filter is basically a circuit which passes certain range of frequencies and blocks certain range of frequencies. There are two main categories analog and digital. Depending on the transfer characteristics the filters are of four types viz. LPF, HPF, BPF and BSF.
Filters are used in communication receiver.
Sharp crystal filters are used to obtain better selectivity in wireless receivers. These crystal filters are usually made of lattice variety. Refer quartz crystal basics for more information.
Like crystal filters, the ceramic filters are also based on piezoelectric principle. Ceramic also has resonant frequency which depends on size and thickness. They are designed for specific bandwidth and hence are ideal to achieve desired selectivity.
Ceramic material can be cut and can be shaped as per requirement. Hence it is sharply resonant over narrow band of frequencies which has resonant frequency as center frequency.
The difference between them is ceramic BPFs are small and less expensive compare to crystal filters. Hence ceramic filters are widely used.
All modern receiver designs employ some form of ceramic or crystal filter. These filters are packaged as unit are connected directly in the circuit such as at the output of RF mixer.
Filter is the circuit which sets the bandwidth of the receiver.
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