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Latest PAs and LNAs from Avago target femtocells

Fri, 06/22/2012 - 7:34am
ECN Europe

Avago has released several new wireless products targeted at macrocell and small cell base stations and portable GPS systems. Power amplifiers in the MGA-43×28 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 power amplifiers are implemented as a three-stage design and display performance of excellent linearity of 50 dBcadjacent-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, & 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 packaged in a 5mm x 5mm package that has a footprint 50% smaller than comparable devices, according to the company.

The MGA-16×16 series of balanced ultra-low-noise amplifiers include integrated active biasing and a shutdown functionality.  They are ideal solutions for cellular infrastructure applications such as base station transceiver cards, remote radio heads, tower-mounted amplifiers and base station combiners. The balanced LNAs deliver superior 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.

The amplifiers have excellent gain of 18.5 dB and deliver 2X the linearity of competing devices at 19.1 dB at 900 MHz. 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 released was a filter-LNA module designed to simplify portable navigation systems and embedded GPS/GNSS systems in tablets and cell phones. The AGPS-F001 pairs a patented Avago FBAR filter with a low-noise GaAs E-pHEMT amplifier in a single package, and continues Avago leadership of integrated LNA/filter solutions for GPS applications. The combination gives exceptional rejectionacross the Cell/DCS/PCS/WLAN bands, ranging from 43 dBc to 53 dBc depending on the frequency band of the signal, and linearity is 10 dBm higher in OOB IIP3 versus competing solutions.

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 AGPS-F001 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.

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