Linear power amplifier intended for 4G LTE infrastructure

Avago’s latest high-gain, high-linearity power amplifier for high-data-rate applications is for 700-800 MHz cellular infrastructure equipment. The new high-linearity MGA-43128 amplifier provides superior signal transmission quality with low power consumption for LTE AP, CPE, and picocell equipment and can also serve as a base station driver amplifier.

Picture: Avago

The MGA-43128 features low distortion and high power added efficiency (PAE) that help reduce power consumption. RF input is fully matched while the output includes integrated pre-match circuitry for matching and application simplicity. An integrated bypass switch controlled attenuator provides up to 18.0 dB attenuation, and the device also has a temperature-compensated power detector on chip.

The new MGA-43128 device’s very linear output power is achieved by using an Avago proprietary 0.25 µm GaAs Enhancement-mode pHEMT process, which allows single 5V supply operation and useable performance down to 3.3V. The 700 MHz MGA-43128 joins Avago’s 29 dBm linear power amplifier family, following the released MGA-43228 and MGA-43328 power amplifiers that cover 2300 to 2500 MHz and 2500 MHz to 2700 MHz, respectively. All devices in the series have a common package footprint to further simplify design.

The MGA-43128 is offered in a miniature 5.0 x 5.0 x 0.85 mm surface mount, 28-lead QFN package and operates over a temperature range of -40° C to +85° C. The QFN package is lead free and halogen free, and it has a moisture sensitivity rating of MSL-2a to permit a floor-life of four weeks out of the bag.

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