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WiMAX transceiver minimizes component count

Posted: 24 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:WiMAX transceiver? RF design? MAX-Link transceivers?

AT86RF535B WiMAX transceiver from Atmel

Atmel Corp. has announced the second of its MAX-Link series of transceivers designed specifically for WiMAX applications. Along with enhanced WiMAX system functionality, the AT86RF535B enables one of the lowest component costs of any RF reference design on the market today. This frequency-agile, single-chip transceiver operates at 3.5GHz with multiple bandwidth options addressing the requirements of WiMAX base stations and subscriber equipment. Internal configuration and control registers can be programmed to integrate with new and existing baseband devices from different vendors. All of the MAX-Link transceivers promise excellent RF performance with low current consumption, low cost and only a minimum of external components for the RF design.

Full digital control
On-chip integration techniques combine an LNA, power amplifier driver, receive/transmit mixer, receive/transmit filters, voltage-controlled oscillator, synthesizer, receive gain control and transmit power control all completely digitally controlled. The fully differential design of the transceiver can be configured for either low-IF or zero-IF applications and requires no external filters. The RF reference design incorporates power efficiency circuitry and antenna diversity all in a footprint of 40-by-35mm on a 4-layer PCB with components on one side only.

The AT86RF535B uses a proprietary internal calibration algorithm decreasing product cost and improving manufacturability. The calibration routine is performed between transmit and receive data frames, totally independent from the baseband and MAC processor, to optimize the image and local oscillator leakage performance characteristics.

Unique PID
The fractional-N synthesizer in the AT86RF535B uses a unique phase interpolation divider rather than the more conventional modulus divider architecture. The PID allows for very good frequency resolution and fast tuning speed. The calibrated VCO can be tuned in less than 10?s to support 100 MHz HFDD operations. The synthesizer has the speed and power advantages of an asynchronous divider and is fully programmable within the frequency range of the radio.

The AT86RF535B is available today. Pricing starts at $14.95 in quantities of 10,000. Modules incorporating the AT86RF535B transceiver, baseband, and MAC are included in the roadmap.

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