Custom Search
Over 9,000 pages indexed!
Your Host
Click here to read about RF CafeKirt
Blattenberger
... single-handedly
redefining what an
engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse riding business website - lots of info

Doggy Dynasty:
My son-in-law's dog training business
•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<
Job Board
About RF Cafe©
RF Cafe E-Mail
Product & Service
Directory		 Engineering
Jobs
Personally Selected
Manufacturers		 Employers Only
(no recruiters)
802.11 a/g power control - RF Cafe Forums
Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


wahooburger
 Post subject: 802.11 a/g power control
Posted: Thu Jun 23, 2005 10:48 am 
 
Captain

Joined: Thu Jun 23, 2005 10:47 am
Posts: 6
Hello all, does anyone know where I can find information on the power control scheme in 802.11a/g systems?

Is the transmit power controlled by adjusting the output of the 802.11 baseband processor, or is the power controlled in the RF portion of the circuit using a variable gain amplifier?

It sounds like 802.11h is the brains of the transmit power control system, but I would like to find out the physical implementation.

Thanks so much for any tips!


 
   
 
Kirt Blattenberger
 Post subject:
Posted: Fri Jun 24, 2005 11:04 am 
 
Site Admin
User avatar

Joined: Sun Aug 03, 2003 2:02 pm
Posts: 653
Location: Erie, PA
Greetings wahooburger (sounds a lot like my nane ;)):

Power control is implemented in the transceiver. The transceiver output typically feeds directly into the PA. Most WLAN PAs now have a built-in power detector that feeds back to the transceiver. Bias control on the PAs is used to achieve best performance (EVM, harmonics, Psat, etc.), but the gain of the PA is usually fixed by design (about 30 dB for a 3-stage device).

SiGe, RFMD, Fairchild, Gatax, Tavanza, RFIC, RF Solutions, Skyworks, and many others make WLAN PAs. You can get scads of info from their websites.


- Kirt Blattenberger :smt024




Posted  11/12/2012

RF Cafe Software

RF Cascade Workbook
 RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

Smith Chart™ for Excel
Smith Chart™ for Visio
RF & EE Symbols Word
RF Stencils for Visio
A Disruptive Web Presence™

Custom Search
Over 9,000 pages indexed!
 Read About RF Cafe
Webmaster: Kirt Blattenberger
KB3UON

Product & Service Directory
Personally Selected Manufacturers

 RF Cafe T-Shirts & Mugs
Calculator Workbook
RF Workbench
Please Support My Advertisers