My customer has designed a RF downconverter using AD8344 as the following conditions.
RF freq : 766.5MHz / -30dBm
LO freq : 579.1MHz / 0dBm
IF freq : 187.4MHz
Circuit design : EVB schematic in datasheet
The conversion gain is about 5 dB and the frequency convertion is normal.
However, the measured noise figure is more than 20dB (datasheet spec : 10.5dB).
Please advise the customer the cause of NF degrading and how to improve it.