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Amplifiers target wireless, portable designs

Posted: 25 Jun 2012 ?? ?Print Version ?Bookmark and Share

Keywords:power amplifiers? ultra-low noise amplifiers? filter-LNA?

Avago Technologies has unveiled a slew of 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 34dB to 40dB of gain and power-added efficiency ranging from a high of 15 percent to 13.8 percent. The power amplifiers are implemented as a three-stage design and display performance of excellent linearity of 50dBc adjacent-channel leakage ratio (ACLR) at 27.3dBm output power when biased with a 5V 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?m 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 percent smaller than comparable devices.

The MGA-16x16 series of balanced ultra-low-noise amplifiers include integrated active biasing and a shutdown functionality. They are suitable 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, 18dB minimum), thus improving signal quality. Offering a noise figure as low as 0.25dB at 900MHz, the first three members in the family, the MGA-16116, 16216, and 16316 are targeted for the 450MHz to 1,450MHz; 1,440MHz to 2,350MHz; and the 1,950MHz to 2,700MHz frequency bands, respectively.

The amplifiers offer a gain of 18.5dB and deliver twice the linearity of competing devices at 19.1dB and 900MHz. 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.

Avago wireless products

The devices are designed to simplify system design of small cell base stations, macrocells and GPS systems.

The company also released a filter-LNA module designed to simplify portable navigation systems and embedded GPS/GNSS systems in tablets and cellphones. The AGPS-F001 pairs a patented Avago FBAR filter with a low-noise GaAs E-pHEMT amplifier in a single package, claiming improved rejection across the Cell/DCS/PCS/WLAN bands, ranging from 43dBc to 53dBc depending on the frequency band of the signal, and linearity is 10dBm higher in OOB IIP3 versus competing solutions.

The AGPS-F001 has a typical noise figure of 1.7dB, 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?A; during normal operation the filter/amplifier draws 5.5mA from a 2.7V supply and provides a gain of 16.5dB at a frequency of 1.575GHz.

All the amplifiers and filter/amplifier are housed in small leadless packages. The MGA16x16 series is in 4 x 4 x 0.85mm 16-contact QFN packages. The MGA43x28 series is in 5 x 5 1mm 28-contact QFN packages. And the AGPS-F001 is in a 2.3 x 1.7 x 0.9mm 6-contact QFN package. Samples of all devices will be available in June, with production quantities available in 4Q12.

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