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Wireless LAN Card

Wireless LAN Card

Block Diagram


ADC 1 ADC 2 Baseband Processor & Medium Access Controller DAC 1 DAC 2 DC/DC Buck Converter Dual Output LDO I&Q Transceiver LDO PCI/CardBus/USB Host Interface RF Front End Supply Voltage Supervisor USB Power Control

Design Considerations

WLAN Card

The WLAN Card is used with a personal computer to access a Wireless Local Area Networks (WLAN), which can extend or replace traditional wired computer networks by transmitting and receiving data radio waves using Spread-Spectrum Technology (SST).

There are four main standards for WLANs: 802.11, 802.11a, 802.11b, and 802.11g. The last 3 standards operate in the same environment without causing interference with each other. The 802.11b is the dominant standard with 11-Mbps rates in the 2.4HGz band. The 802.11a is capable of reaching 54-Mbps rates in the 5GHz band. The 802.11g standard also has 54-Mbps but is compatible with 802.11b. The 802.11b technology implements the Digital Sequence Spread Spectrum (DSSS) modulation. The 802.11a/g implements the Orthogonal Frequency Division Multiplexing (OFDM) modulation.

Core Subsystem include:

  • RF/IF Front End
     - filters/amplifies RF signal and performs RF-to-IF conversion to generate I and Q data for ADC and DAC.
     
  • Baseband Processor of Physical Layer (PHY)
     - modulates and demodulates I and Q data and performs carrier sensing, transmission and receiving frames.
     
  • Medium Access Controller (MAC)
     - controls the communication (access) between client and applications.
     
  • Power Conversion
     - receives power supply via the host interface.


Application Notes

  • Board and System Design Considerations for the TMS320VC5503/06/07/09A DSPs (sprab14.htm, 8 KB)
    19 Nov 2008 Abstract
    

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