Avago Technologies has developed multiple new wireless products targeted at macrocell and small cell base stations, and portable GPS systems.
Power amplifiers in the MGA-43x28 series provide final stage gain for picocell and enterprise femtocell systems, offering 34 to 40 dB of gain and power-added efficiency ranging from a high of 15% to 13,8%. The devices are implemented as a three-stage design and display linearity of 50 dBc adjacent-channel leakage ratio (ACLR) at 27,3 dBm output power when biased with a 5 V supply.
The first three amplifiers in the family, MGA43428, 43528 and 43628, are each targeted at a different frequency band – 3GPP bands 5, 2/25 and 1, respectively. All are fabricated using an Avago 0,25 μm GaAs enhancement mode pHEMT process and also include a detector block integrated on the chip. The amplifiers are housed in a 5 x 5 mm package.
The MGA-16x16 series of balanced low-noise amplifiers (LNAs) includes integrated active biasing and shutdown functionality. They are designed for cellular infrastructure applications such as base station transceiver cards, remote radio heads, tower-mounted amplifiers and base station combiners.
The balanced LNAs deliver gain of 18,5 dB and elevated return-loss characteristics (S11, 18 dB minimum), thus improving signal quality. Offering a noise figure as low as 0,25 dB at 900 MHz, the first three members in the family, the MGA-16116, 16216 and 16316, are targeted for the 450 to 1450 MHz, the 1440 to 2350 MHz, and the 1950 to 2700 MHz frequency bands, respectively. A DC voltage applied to a control pin will shut down the amplifier and bypass it when the system already has sufficient signal strength, thus preventing over-amplification and signal distortion.
Also new is a filter-LNA module designed to simplify portable navigation systems and embedded GPS/GNSS systems. The AGPS-F001 pairs a patented Avago FBAR filter with a low-noise GaAs E-pHEMT amplifier in a single package. The combination gives excellent rejection across the cell/DCS/PCS/WLAN bands, ranging from 43 dBc to 53 dBc depending on the frequency band of the signal.
The AGPS-F001 has a typical noise figure of 1,7 dB, and the noise-figure distribution is tightly controlled to ensure consistent performance from unit to unit. A CMOS compatible shutdown pin allows the IC to shut down and reduce its current draw to less than 1 μA; during normal operation the filter/amplifier draws 5,5 mA from a 2,7 V supply and provides a gain of 16,5 dB at a frequency of 1,575 GHz.
For more information contact EBV Electrolink, +27 (0)21 402 1940, [email protected], www.ebv.com
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