Wireless LAN Card

Wireless LAN Card

Block Diagram

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Reference Designs



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.

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Application Notes (1)

Title Abstract Type Size (KB) Date Views
HTM 8 KB 19 Nov 2008 658

Product Bulletin & White Papers

White Papers (1)

Title Abstract Type Size (MB) Date Views
PDF 213 KB 26 Mar 2009 250

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