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AD9361 output power for OFDM

Question asked by BuzzBizzell on Jan 6, 2017
Latest reply on Jan 9, 2017 by sripad

I have a very specific question about AD9361 output power

 

Basically, we are attempting to estimate the approximate output power that we can expect from the AD9361 transmitter for a DVB-T modulated signal within the 4.4-5.0GHz frequency range. (AD9361 LO freq = 4.4-5.0GHz).  Our usage info is listed below…

 

Modulation: DVB-T, OFDM (1705 carriers, 15dB max PAR, up to 64QAM constellation type)

Channel BW: up to 8MHz

AD9361 Attenuation Setting: 0dB

Frequency Range: 4.4-5.0GHz

 

In the data sheet, they list the max output power for the transmitters in the 5.5GHz band as +6.5dBm with a CW signal.  Based on that number, I would estimate we could obtain approximately a -8.5dBm RMS output for a 15dB PAR at 5.5GHz with a 0dB attenuator setting.  (6.5 max – 15dB PAR = -8.5dBm RMS).  I assume the output power would be marginally higher for the 4.4-5.0GHz band.  So I estimate we should be able to get approximately a -8dBm RMS output power for our DVB-T signal within the 4.4-5.0GHz band.  Does that agree with Analog’s estimated power? 

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