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Avago targets cellular, LTE base stations with LNAs

Posted: 07 Jun 2010     Print Version  Bookmark and Share

Keywords:LNA  amplifier  LTE  WiMAX  base station 

Avago Technologies is targeting the next-generation cellular market with two LNAs that handle1.5GHz to 2.3GHz and 2.3GHz to 4GHz for base station RF front-end. With these devices, the company will complete its next-generation LNA series that covers all cellular bands for GSM, CDMA, UMTS, and WiMAX and LTE bands.

The two new LNAs target cellular infrastructure base station applications, such as transceiver radio cards, tower mounted amplifiers, combiners, repeaters and remote/digital radio heads. They set new standards for low noise figure. The wireless infrastructure industry is challenged to provide optimum coverage with the best signal quality in crowded spectrum. Receiver sensitivity is one of the most critical requirements in a BTS receive path design. Proper LNA selection, in particular the first-stage LNA, greatly affects the BTS receiver sensitivity performance. Low noise figure is a key design goal. Avago offers noise figure of 0.48dB at 1900MHz.

Another key design factor is linearity, which affects the receiver's ability to distinguish between closely spaced wanted and spurious signals. Third order intercept, OIP3, is used to specify linearity. At 1900MHz and typical operating condition of 5V/51mA, Avago's proprietary GaAs Enhancement-mode pHEMT process technology gives a noise figure of 0.48dB and an OIP3 of 35dBm. At 2500MHz and typical operating condition of 5 V/56mA, the noise figure is 0.59dB and OIP3 is 35dBm. With a low NF and high OIP3, the new Avago LNAs offer more design margin for the BTS receiver path than previous amplifiers.

With built-in active bias circuitry, Avago's LNA operating current is adjustable. This allows designers to make trade-offs between operating current and output linearity, as measured by OIP3, while maintaining an optimum noise figure. BTS designers will have the flexibility to meet various design needs and regional requirements with the same Avago LNA.

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