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SAW 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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TriQuint's latest additions to its SAW filter product portfolio are designed to further support network infrastructure roll-outs and upgrades across both emerging, cost-sensitive markets as well as in mature, feature-rich networks," said TriQuint's Director for Networks Product Marketing, Paul Gilgallon.
TriQuint Announces Complete Portfolio of RF Base Station / Repeater / ... by Business Wire
Prior to the TriQuint acquisition Sawtek primarily designed individual SAW filter components for wireless handsets, base stations and military applications.
TriQuint Semiconductor Re-brands SAWTEK Operations by Business Wire
Small and high performances As RF components -- the power amplifier (PA), SAW filter, SAW duplexer, etc.
Fujitsu Media Devices Launches World's Smallest Transmitter Module ... by Business Wire
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