Avago Technologies has developed two next-generation, low-noise amplifiers (LNAs) for base-station (BTS) RF front-end design. With the addition of these 1500 MHz to 2300 MHz and 2300 MHz to 4000 MHz LNAs, Avago’s LNA series now covers all cellular bands for GSM, CDMA, UMTS and WiMAX, as well as next-generation LTE bands.
The devices target cellular infrastructure base station applications, such as transceiver radio cards, tower mounted amplifiers (TMAs), combiners, repeaters and remote/digital radio heads. At 1900 MHz and typical operating condition of 5 V/51 mA, Avago’s proprietary GaAs enhancement-mode pHEMT process technology gives a noise figure of 0,48 dB and an OIP3 of 35 dBm. At 2500 MHz and typical operating condition of 5 V/56 mA, the noise figure is 0,59 dB and OIP3 is 35 dBm.
With built-in active bias circuitry, the LNAs’ operating current is adjustable. This allows designers to make tradeoffs between operating current and output linearity, as measured by OIP3, while maintaining an optimum noise figure. BTS designers thus have the flexibility to meet various design needs and regional requirements with the same LNA. The two new LNAs are offered in 2,0 x 2,0 x 0,85 mm, 8-lead, surface mount QFN packages that are RoHS compliant. All devices operate over a temperature range from -40°C to +85°C.
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