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GPS front-end module packs FBAR filter, LNA

Posted: 12 Nov 2009 ?? ?Print Version ?Bookmark and Share

Keywords:GPS? front-end module? FBAR? LNA?

Avago Technologies has launched a miniature GPS front-end module (FEM) that combines a film bulk acoustic resonator (FBAR) filter with a high-gain, low noise amplifier (LNA). Avago's ALM-1912 comes in a compact package to provide a complete GPS RF FEM, simplifying simplifies the design of a wide range of GPS handset applications.

The device is designed for use in mobile handsets, PNDs and other GPS-enabled applications. It is housed in a 2.9mm x 2mm x 1mm MCOB package, making it suitable in space-constrained applications. The integration of FBAR pre-filtering enables the FEM to provide exceptional rejection at cell, PCS and Wi-Fi/Bluetooth frequencies. Also, this GPS FEM effectively leverages Avago's 0.25?m GaAs enhancement-mode pHEMT process to deliver a 1.62dB noise figure, 19.3dB gain, and +1.5dBm input third order intercept point (IIP3) and more than 50dBc of out of band rejection 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-1912 delivers a very low noise figure and high linearity which helps to significantly improve the sensitivity of GPS handset applications. A CMOS-compatible shutdown pin is included for turning the LNA on/off or for current adjustment. The integrated pre-filter uses Avago's leading-edge proprietary FBAR filtering technologies to provide exceptional rejection at cell/PCS-band, and Wi-Fi/Bluetooth frequencies making it a suitable solution to help enhance the performance of GPS receivers for S-GPS operation in handsets and other mobile devices.

The ALM-1912 has a built-in shunt inductor at the RF input pin to enhance ESD production, which allows the device to survive more than 3kV (HBM) ESD charge at the RF input pin. By integrating a GPS LNA with pre- and post high-rejection FBAR filters, the high-performance ALM-1912 simplifies and shortens the RF design process, reduces component count, and provides excellent RF performance levels that are critical in GPS applications.

The device also offers adjustable bias current via single external resistor/voltage. It is halogen- and Pb-free and RoHS-compliant.

The Avago ALM-1912 high-rejection GPS high-gain LNA is priced at $1.31 each in 10,000-piece quantities. Samples and production quantities are available now.

For application notes on front-end module click here.

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