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WiMAX RF transceiver cuts chip count, board space

Posted: 18 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:WiMAX RF transceiver? WiMAX? Wi-Fi?

Maxim Integrated Products introduced the MAX2837, a single-chip WiMAX RF transceiver in high-volume production.

Designed using a zero-IF architecture, this transceiver requires neither a SAW filter nor extra VCO circuitry, both of which are needed by existing superheterodyne solutions. As a result, MAX2837 reduces component count and board space. Designed for OFDM-based non-line-of-sight (NLOS) wireless broadband radio systems which operate in the 2.3 GHz to 2.7 GHz band, the MAX2837 is suitable for 802.16d/e fixed and mobile WiMAX, dual-mode WiMAX/Wi-Fi, Korean WiBro and future 4G LTE systems. An SPI-compatible interface enables electronic programming of channel filtering to support multiple channel bandwidths of 1.75-28MHz.

MAX2837 integrates a digitally controlled crystal oscillator (DCXO) which enables the use of a low-cost, ?25 ppm or higher crystal in place of an expensive TCXO. Combined with the 25 Hz step-size of the integrated RF synthesizer, the DCXO allows the implementation of digital automatic frequency control (AFC) for improved system range and data-throughput performance.

It features a 2.3dB receiver noise figure, -11dBm input IP3, -40dBc integrated VCO phase noise and 250mW power consumption. Receiver EVM is better than -35dB and sideband suppression is >45dB.

On the transmitter, MAX2837 delivers 0dBm linear output with 64-QAM signal, >45dB sideband suppression and better than -36dB EVM while meeting a -70dBr spectral mask. The high linearity of the transmitter output allows this transceiver to be used in WiMAX micro or pico base stations, in addition to subscriber CPE or PC card devices. MAX2837 operates from a 2.7V to 3.6V supply. A 10?A low-power shutdown mode helps save power in system-sleep/standby mode.

Devices are now available with pricing starting at $8.38 each in 1,000-piece quantities

- Emily Gleason

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