SiGe Semiconductor, Inc. announced two RF front-end modules designed to enable new wireless multimedia services in 802.11 a/b/g/n WLANs. The SE2547A and SE2548A integrate all of the functionality required between the transceiver and the antenna in dual-band WiFi systems. The devices include power amplifiers, filtering, power detector, diversity switch, diplexers and associated matching circuitry in a fully tested module that measures 25 mm2. The SE2547A and SE2548A are well suited for use in portable and consumer applications including mini-cards for personal computing, and can be used to support emerging 802.11n applications such as video distribution, video streaming and high-speed data..
The front-end modules can be used alone, or in stacked configurations to support multiple stream applications. The SE2548A is equipped with a single antenna port allowing it to be used in 2 stream by 2 antenna configuration. The SE2547A provides two antenna ports, allowing two stream by 3 antenna or two stream by 4 antenna configurations.
The SE2547A or SE2548A are optimized to deliver high linearity at industry-leading transmit power levels of +18dBm in 2.5 GHz and +17dBm at 5 GHz, with best-in-class ACPR performance. The front-end modules include a transmitter power detector for each band and transmit chain with 20 dB of dynamic range for each transmit chain.
All RF ports are matched to 50 . Each transmit chain has a separate digital enable control pin for transmitter power ramp on/off control to aid in power management. The RF front-end modules provide all matching and tuning and are fully tested.The SE2547A and SE2548A are in production now, priced at $2.15 and $2.05 in 10,000 unit volumes, respectively.