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Power amp tailored for 2.4 to 2.5GHz WLAN apps

Posted: 04 Dec 2009     Print Version  Bookmark and Share

Keywords:power amplifier  WLAN  WiMAX 

Microsemi Corp. has started volume production of its LX5518 power amplifier (PA) for IEEE 802.11b/g/n WLAN applications in the 2.4- to 2.5GHz frequency range.

The LX5518 is optimised for ultra high linear output power from -40°to +85°C while delivering low power-added efficiency (PAE). It is designed for high-performance applications such as wireless access points and routers that demand improved broadcast range and data rates to accommodate challenging RF transmission environments. The LX5518 PA also meets these challenges by delivering 26.2dBm of OFDM output power at 3 per cent error vector magnitude while consuming only 391mA of current for cooler operation.

The device also features 50Ω input match, simplified output match, and temperature-compensated on-chip output power detector with wide dynamic range.

The LX5518 is pin-compatible with Microsemi's earlier LX5535 power amplifier, and adds 1.5—2dBm of output power, enabling customers to migrate easily to higher power without requiring changes to their existing designs.

"This new LX5518 device reflects Microsemi's leadership in WLAN power amplifiers, demonstrating our ability to alleviate difficult thermal performance challenges typically found in high-output power applications," said Kang Hee Kim, RF product line manager with Microsemi's analogue mixed signal group. "It can simplify the design of new high-output-power WLAN products as well as next-generation products migrating from our earlier LX5535 amplifier."

Microsemi's broad portfolio of IEEE 802.11a/b/g/n WLAN, 802.16e WiMAX and WiBro power amplifiers are used in a variety of applications including wireless access points and half mini-cards for notebooks and netbooks. Reference designs with WLAN chipset manufacturers are available.

The LX5518 is in volume production and housed in an RoHS-compliant 16-pin, 3mm x 3mm x 0.9mm QFN package. Pricing in 10,000-unit quantities is Rs. 35.06 ($0.75). Datasheets, application notes, and evaluation kit information are available.

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