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RF modules with high power output

Posted: 10 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:sige semiconductor? wlan rf? front-end module? rangecharger? se2551a?

SiGe Semiconductor claims the industry's first completely 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. Both products are based on SiGe Semiconductor's proven, highly integrated 2.4GHz 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-by-5-by-1.4mm chip-scale package. The two variants provide flexibility in meeting individual transceiver requirements, providing designers with a choice of a differential receive output with the SE2551A, or a single-ended receive output with the SE2557A.

The RF front-end modules are designed specifically for high performance and low power consumption. Featuring high power output as well as excellent rejection and isolation, both circuits allow simultaneous transmission and reception of WLAN and cellular signals.

Operating in 802.11g mode, the devices consume 120mA, ensuring that WLAN capability can be added to cellular phones with minimal impact to battery life. The SE2551A and SE2557A solve the primary challenge faced by cellular handset manufacturers looking to support WLAN capability: ensuring a positive user experience while simultaneously transmitting and receiving cellular and WLAN signals. Unlike competitive solutions, the new RF front-ends feature excellent rejection of typically 35dB in all 4 GSM bands, in both transmit and receive mode. This dramatically reduces interference, thereby enhancing signal integrity and improving overall system performance.

- Henri Arnold
Electronics Express Europe

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