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Phase calculation of EVAL-AD5933

Question asked by ml1 on Oct 14, 2015
Latest reply on Oct 15, 2015 by mcee

Hello,

 

I have problem understanding how the phase is calculated in the user guide of the AD5933 evaluation board.

Phase is atan(Imaginary/real).

 

In figure 16 of the user guide (http://www.analog.com/media/en/technical-documentation/user-guides/UG-364.pdf), for 30000Hz, imaginary is 8990 and real is -3726. How is the phase -7.88e-2 (close to 0)?

 

Thank you.

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