Post subject: WiMAX amplifier Posted: Sat Sep 19, 2009
Joined: Wed Jun 04, 2008 3:23 am
In the datasheet for a WiMAX amplifier, a channel power is defined
as well as an output P1dB which is higher than the channel power. What
is the definition for both and how does one measure the quantities?
Post subject: Re: WiMAX amplifierPosted:
Sun Sep 20, 2009 3:48 pm
Joined: Mon Jun
27, 2005 2:02 pm
I guess that by channel power the definition is for the average
output power of the amplifier per a given channel (Frequenc band). This
is the output power in steady state under given settings like: filter
(Raised-Cosine etc), clipping rate, modulation scheme etc, which actually
set the PAR (Peak to Average Ratio) and by this determine the average
P1dB is the output power at which the amplifier's small-signal
gain is decreased by 1dB. This power level is close to the saturation
power level, and in many cases can be considered as the peak power.
Both these power levels can be measured with power meter. Don't
forget an adequate power attenuator infront of it to protect the power
sensor from excessive power.