AD8302 Phase Detector, Labview interfacing

Having a reference of -30 dBm (-43 dBV in a 50 Ohm system) on one of the inputs is the optimum for maximum measurement range.  For example if one signal is at -30 dBm, the other signal can range from 0 dBm (-13 dBV) to -60  dBm (-73 dBV), to give a gain measurement of +30 dB to -30 dB, respectively.  

BTW, dBV is defined as:  X dBV = 20*log10(Vrms/1Vrms)

The phase detector is a little less sensitive with amplitude, but the VPHS output does vary a bit with different amplitude.  See Figures 42 through 47 in the datasheet.

You will probably need either a DMM or a scope to sample the outputs, VMAG and VPHS, to interface with Labview.

Regards,

Joel

Ok, if I use 2V 500MHz Sine signal as Input A and 20mV 500MHz as input B, Can AD8302 measure the phase difference between two?

what do you mean by scope? Is it Oscilloscope?

Thanks

If you have a 40 dB difference in signal amplitudes, there will be some slope error with VPHS (see figures 42 through 47) but it will work.

Yeah sorry, I meant oscilloscope.

Thanks,

Joel