We used the below shown schematic with ADL5906, in our existing developed board
Our operating frequency is 2700MHz to 3100MHz and need to detect the signal levels ranging from 0dBm to -55dBm.
But, we are getting an output voltage of 0.9 to 1.1V without the input signal to device and with the external supply feeding. The same level is observed even when we do 50OHM termination at C189 (18pF, as shown in schematic)
With this issue we are not able to detect our signals < -45dBm.
Please help us to proceed further
the input termination capacitors seems small on RFIN+/RFIN-. it would be good to follow the standard values in datasheet, 10nF, figure 51. also can terminate the source with 50ohm to see to if it's source related.