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802.11 a/g power control - RF Cafe Forums
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| wahooburger
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Post subject: 802.11 a/g power control
Posted: Thu Jun 23, 2005 10:48 am
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Joined: Thu Jun 23, 2005
10:47 am
Posts: 6 |
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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!
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Kirt Blattenberger
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Post subject:
Posted: Fri Jun 24, 2005 11:04 am
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| Site Admin |
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Joined: Sun Aug 03, 2003
2:02 pm
Posts: 653
Location: Erie, PA
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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
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Posted 11/12/2012
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