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Transceiver eases ASIC-compliant base station implementation

Posted: 22 Jan 2010 ?? ?Print Version ?Bookmark and Share

Keywords:transceiver? MCU? microcontroller? 3G?

MAX9947 transceiver

Maxim Integrated Products has developed the MAX9947 fully-integrated, AISG-compliant transceiver. This single-chip solution packs a transmitter, receiver, and active filters into a 3mm x 3mm TQFN package that is 100x smaller than discrete solutions.

The transceiver provides an autodirection output to facilitate RS-485 bus arbitration in tower-mounted equipment without requiring a microcontroller. The high integration of the MAX9947 greatly simplifies the implementation of AISG-compliant base stations and tower-mounted equipment.

Targeting 3G
3G wireless networks were developed to provide the high-speed data services required by data-intensive smart phone applications. Yet, deployment of this infrastructure has been costly, and coverage has been notably inadequate in some areas.

Addressing both of these concerns, the Antenna Interface Standards Group (AISG) developed an interface protocol to enable intelligent antenna systems. The AISG specification allows digital remote control and monitoring of wireless infrastructure to dynamically optimize the network based on changing coverage requirements.

This open standard has quickly been adopted by telecommunications companies because it frees them from proprietary solutions while protecting their infrastructural investments. In turn, base-station and antenna manufacturers have benefited from a standardized technology roadmap, which has increased efficiency in product planning.

Getting AISG compliance
AISG transceivers can be implemented discretely using any number of components and methods. They might use active filters or passive filters, different methods for OOK modulation and demodulation, logic for bus arbitration, amplifiers, and, in some cases, ADCs. Since each transceiver implementation can use a different architecture to achieve AISG compliance, antenna and base-station OEMs must maintain multiple board layouts to accommodate various transceiver designs.


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