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RF/Microwave??

SAW filters aimed at GSM, CDMA cellphones

Posted: 13 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:SAW filter? cellphone? TriQuint Semiconductor?

TriQuint Semiconductor Inc. introduced a family of GSM and CDMA cellphone SAW filters measuring 1.4-by-1.2-by-0.5mm3 for next-generation cellphone designs. The new filters are said to be 40 percent smaller than the ones manufacturers typically use today.

According to Danny King, TriQuint product marketing manager, insertion loss for RF SAW filters directly affects the overall receiver noise figure (a ratio of the thermal noise power measured at output to that at the input point. Noise figures must be minimized to enhance signal clarity). A cellphone's overall noise figure is said to be considered one of most critical system level performance measures that phone manufacturers specify in their designs.

TriQuint claims to be the only SAW supplier maintaining hermeticity in its products today. Hermeticity involves sealing the SAW die inside a ceramic package so that sensitive circuitry is protected from environmental corrosion. Air inside the device is also replaced with inert nitrogen to further ward-off corrosion. Hermeticity is important for SAW filters because the transducers are made of nanometer-thick metal on the surface of a piezoelectric substrate. If moisture comes in contact with transducers, the product becomes susceptible to corrosion over time and reliability of the SAW filter can be put at risk.

The company also offers dual SAW filters in 2-by-1.5mm packages. Dual SAW filters are said to offer further cost and size reduction advantages compared to discrete filter solutions. They are offered in 900/1,800MHz and 850/1,900MHz combinations.

Product samples are currently available.




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