FAQ: AD8302 Gain and Phase with no Input Signal

Document created by Larry Employee on Oct 28, 2009Last modified by AndyR on Jan 31, 2012
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Q.

What is the output voltage of the AD8302 gain/phase detector when there are no signals present on the inputs?

 

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A.

With no input signal, the AD8302 compares the noise on the two inputs.  The noise on the input is generally the same level, so the magnitude output is approximately 0.9V.  Due to an internal 90 deg phase shift, the Phase output is also approximately 0.9V.

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