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LNAs improve GPS receiver sensitivity

Posted: 05 Nov 2009 ?? ?Print Version ?Bookmark and Share

Keywords:LNA? GPS? WiMAX?

Avago Technologies has rolled the a new high-gain LNA with variable current and shutdown functions for use in GPS, unlicensed Industrial, scientific and medical bands, and WiMAX applications. The MGA-231T6 offers a very low noise figure combined with high linearity to help significantly improve the sensitivity of GPS receivers. The compact LNA suits mobile handsets with GPS functions, recreational and navigation GPS receivers, and antennas.

Housed in a compact 2mm x 1.3mm x 0.4mm package, Avago's MGA-231T6 only requires four to five external matching components to help reduce the amount of PCB space and the number of components needed in the design. As a result, designers will be able to develop next-generation GPS applications that are more compact with more features and functions to satisfy the growing needs of consumers. The MGA-231T6 LNA uses Avago's proprietary GaAs Enhancement-mode pHEMT process to achieve high gain with a very low noise figure. In addition, the noise figure distribution is tightly controlled, and a CMOS-compatible shutdown pin which is included for turning the LNA on or off or for current adjustment.

The low-noise figure and high gain, coupled with low current consumption make the MGA-231T6 suitable for use in critical low-power GPS applications or during low battery situations.

The MGA-231T6 LNA features a low noise figure of 1dB typical; high gain of 17.1dB typical; high IIP3 and IP1dB; low external component count; low shutdown current of less than 0.4?A. It offers CMOS compatible shutdown pin and is usable down to a 1.8V supply. In addition, the LNA allows current adjustment via a single external resistor/voltage. It is Pb-free and RoHS-compliant.

Avago's MGA-231T6 GPS high-gain LNA with variable current and shutdown features is priced at $.55 each in 1,000-piece quantities. Samples and production quantities are available now through Avago's direct sales channel and worldwide distribution partners. For application notes on LNAs click here.

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