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Avago's 5x7x1mm FEM allows WiMAX, Wi-Fi co-existence

Posted: 07 Jun 2011     Print Version  Bookmark and Share

Keywords:front-end module  WiMAX  Wi-Fi 

Avago Technologies rolls out the AFEM-S257, its RF front-end module (FEM) that allows the co-existence of WiMAX with other cellular and Wi-Fi radios targeting space-constrained mobile applications in the 2.5GHz to 2.7GHz frequency range.

The module has two receive ports and a single transmit port in a small 5mm x 7mm x 1mm package. According to Avago, the AFEM-S257's small size provides up to 25 per cent space savings over discrete WiMAX solutions.

The module integrates multiple high-performance technologies, which reduces the PCB board footprint, simplifies the design of the device and cuts the time for production and time-to-market.

It also uses Avago's proprietary 0.25-µm GaAs enhancement-mode pHEMT process and leading-edge Film Bulk Acoustic Resonator (FBAR) filtering technologies.

The FBAR technology, according to Avago, delivers steep roll-off and low insertion loss, resulting in extended battery life and talk time and better signal quality. It also features a high noise rejection of 35dBc, enabling fewer interference issues between IEEE 802.16 WiMAX and other radios.

Further, the AFEM-S257 module has 24dBm of WiMAX-compliant output power and maintains an error vector magnitude (EVM) of 2.5 per cent at 16 quadrature amplitude modulation (QAM).

James Wilson, Avago's senior director of marketing for wireless products, said the module offers a complete and compact solution for easier and faster development of mobile WiMAX applications. "With Avago FBAR filtering technology delivering unparalleled out-of-band rejection, the module offers the performance major smartphone makers demand," Wilson said.

Other features of the module include 18 per cent power added efficiency (PAE); all RF ports matched to 50Ω for simplified design; 3V to 5V power supply for TX path; TX gain of 34dB; 3.5dB Noise Figure from ANT to RX; and 25dB of TX/RX isolation and RX1/RX2 isolation.

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