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Questions about  AD9361 dBFS and RSSI

Question asked by Keven.Chen@wpi-group.com on Oct 26, 2016
Latest reply on Oct 26, 2016 by Vinod

Dear Sir:

 

We use AD9361 (AD-FMCOMMS3-EBZ) + Xilinx interface board (EK-Z7-ZC706-G) to do testing, then encountered 2 questions need your help as below.

 

1. We measured receiver power is "-12dBFS@2400MHz" through "iio oscilloscope".  

    From UG-570, we know 0dBFS=0.625V,

    then, -12dBFS=0.625*10^(-12/20)=0.157V

    ==> 10log[(V^2/R)/1mW] = 10*log(0.157^2/50*1000) = -3.07dBm. 

 

    Is it correct?

    

2. We found the units of RSSI is "dB", not "dBm". What the mean of RSSI=0dB ? How can we convert it to dBm?

 

 

Rerards,

Keven

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