By Jim Harrison
The Skyworks SKY66186-11 amplifier addresses small cell communications in the 3G/4G LTE bands 12, 13, 14, and 17. With more mobile devices using LTE cellular to access the internet and 5G cellular on the way, there will be a strong deployment of small cell systems to meet bandwidth requirements. The IC requires minimal external components and is part of a high-linearity, pin-to-pin-compatible PA family supporting all 3GPP bands.
The SKY66186-11 power amplifier features 37-dB gain with very high linearity and excellent output return loss of less than −20 dB. The GaAs device has an integrated coupler for output power monitoring and needs only a single 3.3-V power supply. The 5 x 5-mm, 28-pin chip has 50-Ω input and output, and its active biasing circuitry compensates amplifier performance over temperature, voltage, and process variations. The amplifier can be turned on or off in 6.5 μs.
Power-added efficiency is specified as 12.5% at +23 dBm out and adjacent channel leakage (ACLR) is −50 dB typical, again at +23 dBm out. Quiescent supply current is 125 mA typical and 160 maximum, and typical operational current is 480 mA.
Recommended operating temperature range is 25°C to 85°C. Similar devices include the SKY66184-11 (2,110 to 2,170 MHz) and the SKY66185-11 (851 to 894 MHz). Samples are available now, as is an evaluation board.
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