B39252B8312P810

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Surface acoustic wave (SAW) filters are widely used in many consumer electronic devices. They are especially suited for use in communications systems such as cellular phones, digital radios, and cable head-ends. With their low cost and compact size, SAW filters make it possible to obtain RF signal selectivity with excellent characteristics in very small packages.

The B39252B8312P810 is an example of a SAW filter. This 4-pole filter has an insertion loss of less than 1dB, and a bandwidth of 36MHz. The B39252B8312P810 is used in a variety of applications, including radios, automotive applications, and other consumer electronics that require narrowband transmission filtering.

The B39252B8312P810 is based on the SAW filter\'s operating principle. The device relies on the constant energy propagation in an acoustic wave along a piezoelectric substrate such as quartz. Two electrodes, called IDT fingers, are deposited on each side of the substrate, one for launching the acoustic wave, and the other for receiving the signal. The IDT electrodes are designed to have the same pattern and spacing, with each set of fingers having a slightly different period, as shown in the figure below.

The acoustic waves interact with the IDT fingers, producing reflections that cause some frequencies to be amplified and others to be attenuated. This effectively creates a band-stop or notch filter. By changing the design of the IDT electrodes and the period of each set of finger, more poles can be added to the filter, producing a firmer frequency response. This is why the B39252B8312P810 is a 4-pole filter with a very narrow bandwidth.

The B39252B8312P810, being just one example of a SAW filter, has a wide range of applications, primarily related to communications. It is used in cellular phones and other wireless communication systems for filtering narrowband transmissions. Automotive applications also use it for audio and navigation systems. Its small size, low cost, and excellent characteristics make it a popular choice for consumer electronics designs.

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