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WiMAX MIMO transceiver improves SNR by 10dB

Posted: 02 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:WiMAX MIMO transceiver? mobile WiMAX? wireless broadband?


Maxim Integrated Products claims the MAX2839, is the industry's first single-chip, 2.3-2.7GHz, WiMAX MIMO RF transceiver in high-volume production. This device uses a dual-receiver architecture to mitigate RF channel fading, thereby increasing the SNR by as much as 10dB compared to a single-receiver architecture. This improved performance maximizes the data throughput and radio-link range of nomadic and mobile WiMAX subscriber applications in notebook computers, express/PC cards, smartphones and in-home desktop CPE modems. Currently shipping in volume to customers worldwide, the MAX2839 is ideal for mobile WiMAX, Korean WiBro, and other OFDM-based wireless broadband systems.

Designed using Maxim's in-house, high-performance SiGe BiCMOS process, the MAX2839 provides the industry's best receiver noise performance. Both of the two receivers feature the industry's lowest noise figure at 2.3dB, -81dBm sensitivity for a 64-QAM signal at 5MHz channel bandwidth, and a 95dB gain control range that is digitally controlled in 1dB steps. Factory calibrated to achieve better than -35dB EVM, -45dBc of sideband suppression, and carrier leakage of -40dBc without DC-offset correction, the receivers significantly simplify integration with the digital MAC/baseband IC.

On the transmitter, the MAX2839 features a 62dB gain control range, digitally controlled in 1dB steps. It delivers a 0dBm linear output with a 64-QAM signal, greater than -45dBc of sideband suppression, and more than -36dB EVM, while meeting a -70dBr spectral mask.

The MAX2839 operates from a 2.7V to 3.6V supply. A low-power shutdown mode reduces current consumption to 10?A to save power in system-sleep/standby mode. This transceiver is available in a small, 8mm x 8mm, leadless, 56-pin TQFN package. Pricing starts at $9.31 (1,000-up). An evaluation kit is available to speed designs. Contact the factory for the radio reference design or the complete RF and MAC/baseband reference design.

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