SAW filter

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).
References in periodicals archive ?
Exhibit 10: Global SAW Filter Market 2013-2018 (US$ million)
Satellite radio is just one of the many applications for our SAW filter products.
TABLE 14 GLOBAL SAW FILTER SHIPMENT ESTIMATES BY AIR INTERFACE TECHNOLOGY,
The world SAW filter market is growing primarily due to the mobile devices market.
New SAW Filter Doubles Passband From 50 MHz to 100 MHz With Breakthrough Design for 2-Way Set-Top Box, Modem Applications
TriQuint's New Ultra Low Loss, High Rejection GPS SAW Filter Adds To Company's Broad PND Portfolio
It demonstrates how Clarisay's RF SAW filter technology can be leveraged to uniquely meet demanding system requirements such as ThinkCore faced and to facilitate the introduction of innovative wireless products.
With an estimated 66% GPS SAW filter share, TriQuint Semiconductor leads in supplying low-cost, high-performance devices for PNDs made by three of the top four(1) major manufacturers that include Garmin, Tom-Tom, Mio Technology and Magellan.
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.
Each of these region-specific UMTS front-end modules incorporates the power amplifier, transmit SAW filter and duplexer, which reduces the number of i/o interfaces, and therefore the integration complexity, faced by 3G multimode handset designers.
The single-chip solution eliminates an expensive, bulky IF SAW filter found on existing solutions today.