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AD8307's datasheet mistake?

Question asked by edovis on Apr 18, 2017
Latest reply on Apr 19, 2017 by edovis

Hi, everybody.

 

I'm currently working on a SWR/RF Power meter using two AD8307. I would like to use the same circuit that appears on page 21 (or 22 from the beginning of pdf file) under title "1uW to 1kW 50 Ohm Power Meter". The application note says the circuit uses a 158:1 (or 44 dB) voltage attenuator in order to sample the main 50 Ohm transmission line. However, after a quick inspection and calculation I only can verify the 158:1 attenuation which is only 22 dB and not 44 dB as stated.

 

Am I missing something or is this a datasheet mistake?

 

Thanks for the help, guys!

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