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GPS LNA packs pre-/post-high rejection filters

Posted: 23 Sep 2009 ?? ?Print Version ?Bookmark and Share

Keywords:LNA? GPS? FBAR filter?

ALM-1812 LNA

Avago Technologies has introduced a miniature, compact and highly integrated GPS LNA that offers superior performance levels. Avago's ALM-1812 integrates an LNA and pre- and post high-rejection filters to provide a complete high-performance GPS RF front-end module that will help simplify the design of a wide range of GPS handset applications. Avago is a supplier of analog interface components for communications, industrial and consumer applications.

Avago's ALM-1812 is designed for the 1.575GHz frequency band and is housed in a miniature 4.5mm x 2.2mm x 1mm, Pb-free and RoHS-compliant MCOB package, reducing PCB space by more than 50 percent when compared to discrete-only solutions. The integration of FBAR filtering enables the ALM-1812 to reach more than 90dBc of Cell/PCS-band rejection. It effectively leverages Avago's 0.25?m GaAs enhancement-mode pHEMT process to deliver a 1.66dB noise figure, 18.5dB gain, and +2dBm input third order intercept point at typical operating conditions of 2.7V and 6mA.

Simultaneous GPS (S-GPS), and other location-based GPS services, require a high level of receiver sensitivity. Avago's ALM-1812 delivers a very low noise figure and high linearity which helps to significantly improve the sensitivity of GPS applications. Also, the integrated FBAR filter offers exceptional rejection at Cell/PCS-band frequencies and Wi-Fi/Bluetooth, which makes it an ideal device to help improve the performance of GPS receivers for S-GPS operation in handsets.

The ALM-1812 has a built-in shunt inductor at the RF input pin to enhance ESD production. By integrating a GPS LNA with pre- and post high-rejection film bulk acoustic resonator (FBAR) filters, the ALM-1812 simplifies and shortens the RF design process, reduces component count and provides excellent RF performance levels that are critical in the use of GPS applications.

Samples and production quantities of ALM-1812 high rejection GPS high-gain LNA are available now through Avago's direct sales channel and worldwide distribution partners.

For application notes on LNA click here.

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