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LNA series promise improved receiver sensitivity

Posted: 10 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:LNA? amplifier? base transceiver station? TMA applications?

Avago Technologies has released two series of low-noise amplifiers (LNAs), the MGA-63xP8 LNAs and ALM-11x36 fail-safe bypass LNA modules. Avago claims the LNAs feature excellent noise performance and high linearity and offer improved receiver sensitivity for base transceiver stations (BTS) and tower mounted amplifiers (TMA) applications.

The MGA-63xP8 devices and ALM-11x36 modules expand Avago's LNA portfolio for BTS applications, which leverage the company's proprietary 0.25?m GaAs Enhancement-mode pHEMT process to deliver low noise figure and high linearity. As opposed to a broadband approach, each device of the new series of LNAs is optimized for superior end performance at specific frequency operation ranges. Both new LNA series exemplify this philosophy.

Reflecting the portfolio's emphasis on integration, the ALM-11x36 modules can replace large discrete and surface-mount component counts in conventional designs, shortening design cycle time and providing board space savings.


Avago's MGA-63xP8 LNA series.

The high-linearity MGA-63xP8 LNA series integrates active bias circuitry and a power down function, simplifying design by eliminating the need for external discrete components to perform the same functions. The series offers high-gain performance consistent across 700每2600MHz, with the MGA-636P8 device operating from 450每1500MHz, while the MGA-637P8 and MGA-638P8 operate from 1500每2500MHz and 2500每4000MHz, respectively. The series supports all major cellular bands for GSM, CDMA and UMTS, as well as the next-generation LTE bands. The LNAs are housed in a common footprint miniature package measuring 2 x 2 x 0.75mm. With a shared pin-out and layout of external matching network, the LNAs provide a common PCB layout for customers when used at different frequencies. The series is designed as second or third stage LNAs for cellular BTS radio cards, TMAs, combiners, repeaters and remote or digital radio heads.


Avago's ALM-11x36 LNA modules.

The ALM-11x36 LNA modules are equipped with a fail-safe bypass function, which is critical for TMA applications to enable the LNA bidirectional bypass path during the absence of DC power supply. Their superior bypass isolation eliminates the possibility of oscillation issues, and the modules also feature low bypass insertion loss and high input and output return loss. All matching components are fully integrated within the modules and the 50? RF input and output pins are already internally AC-coupled. This makes the modules easy to use, as the only external parts required are DC supply bypass capacitors. The series delivers optimum performance across a wide range of bands, with the ALM-11036 module covering 776每870MHz, the ALM-11136 module covering 870每915MHz, the ALM-11236 module covering 1710每1850MHz and the ALM-11336 module covering 1850每1980MHz. All the modules share the same compact 7x10x1.5mm package and pin out configuration and are targeted for common platform designs.

The MGA-63xP8 LNAs ship in a surface mount 8-lead QFN package. The ALM-11x36 LNA modules ship in a 36-lead MCOB package. Samples and production quantities are available now through the Avago direct sales channel and via worldwide distribution partners.

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