when to use saw filter

What can a SAW filter be used for?

SAW filters are electromechanical devices used in wide range of radio frequency applications providing frequency control, frequency selection and signal processing capabilities. Their performance is based on piezoelectric characteristics of a substrate (which will almost always be a crystal).

What's the best frequency for a SAW filter?

Surface Acoustic Wave (SAW) filters are best suited for applications up to 3 GHz. The filter selectivity starts to decline above 1.5 GHz, and at about 3 GHz their use is limited to applications that have modest performance requirements. The center frequency of a SAW filter is impacted considerably by temperature variations.

How does a surface acoustic wave ( SAW ) filter work?

SAW filter. A Surface Acoustic Wave (SAW) filter is a filter whereby the electrical input signal is converted to a acoustic wave by so-called interdigital transducers (IDTs) on a piezoelectric substrate such as quartz.

When to use SAW filters instead of LC filters?

Initially, the SAW filters are used instead of LC filters at IF stage of TVs. Later on SAW filters are employed in radar, CATV, mobile phones, pagers, satellite tuners and so on. There are three main types of SAW filters. • The figure-1 depicts IIDT (Inter-digitated Inter-Digital Transducer) SAW filter structure.


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