23 March 2010


Avago claims lowest noise figure for GPS filter-LNA-filter module

Avago Technologies has expanded its range of ultra-low-noise GPS front-end modules for mobile GPS applications. The ALM-2712, which has what is claimed to be the industry's lowest noise figure of any GPS filter-LNA-filter modules, integrates pre- and post-high-rejection FBAR filters. This provides low insertion loss in GPS band frequencies and exceptional out-of-band rejection at cellular, DCS/PCS and WLAN band frequencies, suiting use in simultaneous GPS (S-GPS), voice and data operations in today’s mobile handsets.

S-GPS and other location-based GPS services used in mobile handsets require a high level of receiver sensitivity, says Avago. The ALM-2712 delivers a very low noise figure and high-linearity performance, which helps to improve the sensitivity of GPS receivers. By integrating the low-noise amplifier (LNA), pre- and post-high-rejection FBAR filters, and other RF matching components into the module, the ALM-2712 needs no external RF matching components, helping to simplify design processes and reduce board space and component count (requiring just two bypass capacitors). It also has a built-in shunt inductor at the RF input pin to enhance ESD protection, allowing the device to survive more than 3kV of Human Body Model (HBM) ESD charge at the RF input pin.

The ALM-2712 GPS module is housed in a miniature 3.0mm by 2.5mm by 1.0mm MCOB package, suiting in space-constrained applications. At a typical operating condition of 2.7V and 7.5mA, the GPS front-end module effectively leverages Avago's 0.25µm GaAs enhancement-mode pHEMT process and its proprietary FBAR filtering technologies to deliver a 1.26dB noise figure, 14.2dB gain, and +5dBm input third order intercept point (IIP3) and 89/80/72dBc of out-of-band rejection at cellular, DCS/PCS and WLAN band frequencies. These features combine to make the ALM-2712 suitable for helping to enhance the performance of the GPS receivers used in mobile handsets and other GPS applications.

The ALM-2712 GPS module is priced at $1.44 each in 10,000 piece quantities.

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