Seek to some schematics and circuits of a Wi Fi transmitter.

[sulymani]

Heyy guys do u know any data base or websites that provide any schematics or circuits of Wi Fi wireless transmitter..

Ur inputs are appreciated..

 

[waht]

I don't think you can obtain wifi schematics. The good news is its design is no secret. Like other transmitters it consists of a frequency synthesizer, a digital modulator, a mixer, power amplifier, and a bunch of filters. Today, all these components can be embedded in a single chip.

 

[sulymani]

waht you're right it is no longer secret. somtimes, the person needs insight about something. personally, i am trying to know what exactly i need to build a radio that uses the WiFi mechanism since it goes under the legal medical band in the usa. I ve been lookin up to it online but none has come out. I am sure we have great members here in this great forum who have some insights about my unkown.. MY whole idea is to build a transmitter and reciever..

 

[waht]

You know WiFi operates in 2.4 GHz frequency range. It turns out it's very very difficult to build transmitters and receivers in a high frequency range without access to specialized test equipment.


Check out www.arrl.com, their arrl handbook is a valuable resource to have.

 

[berkeman]

waht you're right it is no longer secret. somtimes, the person needs insight about something. personally, i am trying to know what exactly i need to build a radio that uses the WiFi mechanism since it goes under the legal medical band in the usa. I ve been lookin up to it online but none has come out. I am sure we have great members here in this great forum who have some insights about my unkown.. MY whole idea is to build a transmitter and reciever..

For ISM transceivers, several manufacturers make chips or chipsets, and publish schematics, layouts and reference designs. They also generally have evaluation boards that you can purchase and use for testing, etc.

Analog Devices: http://www.analog.com/en/subCat/0,2879,770%255F851%255F0%255F%255F0%255F,00.html

TI: http://focus.ti.com/analog/docs/rfifcomponentshome.tsp?familyId=367&contentType=4&DCMP=TIHomeTracking&HQS=Other+OT+home_p_rf_if

AMI (now part of ON Semiconductor!): http://www.amis.com/products/wireless/index.html

Cypress Wireless USB Solutions: http://www.cypress.com/products/?fid=65&rpn=CYWUSB6935&ref=sch

Keep in mind, though, that the ISM band at 2.4GHz has a lot of existing WiFi traffic, as well as interference from microwave ovens and other sources. Even if you build some good radios, you may experience mediocre performace due to interference. Check out this white paper on my company's website for more information and insight into the problems:

"RF Control Networking, Why Poor Reliability Today Hampers What Could Be a Viable Technology in the Future"
http://www.echelon.com/support/documentation/documents/005-0171A_RF_White_Paper.pdf

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[berkeman]

By the way, here's a link to a pretty good Wireless newsletter that may be of general interest to you:

http://enews.penton.com/enews/rfdesign/emerging_wireless_technology/2008_04_22_rfd_ewt_042208/display

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