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SAW filter
(redirected from Electronic filter)

   Also found in: Wikipedia 0.01 sec.
SAW filter
(Surface Acoustic Wave filter) A semiconductor device that is used to filter out desired frequencies. Widely used in mobile phones to filter both RF and IF frequencies, a SAW filter uses the piezoelectric effect to turn the input signal into vibrations that are turned back into electrical signals in the desired frequency range.

Two sets of metal electrodes like teeth on a comb are adhered to a quartz crystal and spaced apart (in microns) based on the required frequencies. As few as five and as many as 5,000 electrodes are used. An intriguing analogy from Bruce Thomas at Sawtek, a subsidiary of TriQuint Semiconductor, is that the first set of electrodes is like throwing a large log in to a pond, which makes huge waves that cause little sticks to bounce out at the other side (second set).


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Some months later it was made, and it worked exactly as expected," the website said, noting that CCDs can, in addition to their use as image sensors, be used as computer memory, electronic filters and signal processors.
Much better are electronic filters, which trap around 88%, or even higher.
It also has an Intelli-Check Electronic Filter Indicator that monitors pre-filter and HEPA filter usage to tell whether the filters need changing or cleaning.
 
 
 
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