calculating phase using ARCTAN(Q/I)

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sweethomela8

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I'm trying to calculate the phase of a signal by digitizing the inphase and quadrature parts and then doing an digital ARCTAN(Q/I) function on it. My question is, what happens when the inphase component=0? and is there anything you can do about it.

Thanks.
 

Standard C has a function atan2() fot this purpose.
 

You can always do the check (I wrote it in pseudocode):

if (I = 0)
then angle = 90
else angle = arctan(Q/I)
 

I !=0 doesn't actually guarantee that Q/I is a valid float value. That's one reason why atan2() is provided by most C compiler math libraries.
 

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