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SiGe Semiconductor announces integrated WLAN RF front-end modules optimized for cellular handsets. The RangeCharger™ SE2551A and SE2557A ensure that cellular handset manufacturers can support WLAN capability without impacting handset form factor, cellular performance or battery life. The SE2551A and SE2557A are based on SiGe Semiconductor's integrated 2.4 GHz RF front-end architecture, with each device incorporating a linear three-stage power amplifier, power detector, digital enable circuitry, transmit and receive filtering and a receive balun in a small form factor 6 × 5 × 1.4 mm chip-scale package. Featuring high power output as well as good rejection and isolation, the SE2551A and SE2557A each allow simultaneous transmission and reception of WLAN and cellular signals. Operating in 802.11g mode, the devices consume 120 mA, ensuring that WLAN capability can be added to cellular phones with minimal impact to battery life. The SE2551A and SE2557A are capable of +15 dBm output power with an error vector magnitude (EVM) of less than 3% while operating in 802.11g mode, or +17 dBm in 802.11b mode while meeting all ACPR requirements. Also integrated on chip is an integrated power detector that minimizes mismatch to 1.5 dB of variation over a 2:1 antenna mismatch.
SiGe Semiconductor, Inc.

SiGe Semiconductor
http://www.sige.com