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shireesha
Post subject: WiMAX amplifier Posted: Sat Sep 19, 2009 6:41 am

Captain

Joined: Wed Jun 04, 2008 3:23 am
Posts: 11
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?


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IR
Post subject: Re: WiMAX amplifierPosted: Sun Sep 20, 2009 3:48 pm

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello,

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 power.

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.

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