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ADL5801 RF to LO isolation

Question asked by PaulvdM on Aug 31, 2015
Latest reply on Oct 22, 2015 by PaulvdM



Never thought I'd be interested in the isolation in this direction (instead of LO to RF)... but here's my reasoning:


I am using the ADL5801 in a radar receiver where the path length for the LO signal is unfortunately quite long.

I get some ghost returns which seem to coincide with the following path:

--> In at RF port of ADL5801

--> Out at LO port of ADL5801

--> along LO path to remote coupler (where LO signal originates)

--> reflect at the coupler port

--> return to mixer LO port

--> get mixed with original LO signal to form a ghost return


Is there anyone else who thinks this is plausible ?

What would the isolation typically be from the RF port to the LO port of a device like this?


Thank you!