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AD8348, DC operation (phase & amplitude detection)


I would like to use AD8348 as a phase & amplitude detection. However, I couldn't get the DC values from IOPN, IOPP, QOPP, QOPN. It always spit out the down converted frequency (ex: LO-400MHz  IF-210MHz  then down-converted frequency - 10MHz), but not DC values. I need to get the DC values in order to obtain real and imaginary values from LO & IF differences. I used IOFS(QOFS) to null the voltage at the  IOPN, IOPP, QOPP, QOPN. I was able to get the DC values, but it's just stuck there. It's not changing with amplitude and phase variation of IF frequency.

If you have any idea about this problem, please let me know. Thanks.


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