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NF improvement for AD8344

Question asked by jhshin on Jan 26, 2018
Latest reply on Jan 26, 2018 by bsam


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.