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RF front-end modules simplify Wi-Fi system design

Posted: 24 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:RF front-end modules? Wi-Fi? WLAN?

SiGe Semiconductor's newest 802.11a/b/g/n RF front-end modules reduce footprint significantly and provide all the functionality required between the transceiver and the antenna in dual-band Wi-Fi systems.

The SE2547A and SE2548A are complete 802.11a/b/g/n WLAN RF specifically tuned to the demands of wireless multimedia services in client access applications including game consoles, desktop and laptop computers, and home access points.

Each device includes power amplifiers, filtering, power detector, diversity switch, diplexers and other circuits. But the fully tested module that measure just 25 mm?about one-third of the size of previous front-end modules on the market.

Two devices can now be integrated into the footprint previously occupied by one. As a result, small consumer applications can now provide greater throughput and performance in support of emerging wireless multimedia applications such as media distribution throughout the home.

The SE2547A and SE2548A 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.

Systems based on the SE2547A or SE2548A will achieve excellent linearity at industry leading transmit power levels, of 18dBm in 2.5GHz and 17dBm at 5GHz, with best-in-class ACPR performance.

The SE2547A and SE2548A also include a transmitter power detector for each band and transmit chain with 20 dB of dynamic range for each transmit chain. Moreover, the high linearity optimizes transmission of greater data rates over longer distances, thereby allowing systems to support emerging 802.11n applications such as video distribution, video streaming and high-speed data.

All RF ports are matched to 50, which simplifies PCB layout and the interface to the transceiver RFIC. 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, which simplifies design to speed time to market.

The SE2547A and SE2548A are in production now, priced at $2.15 and $2.05 in 10,000 unit volumes, respectively.

- Jack Shandle
Wireless Net DesignLine




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