LDO DC receiver cross feed vs shielding part 2 add DBM
Looking at the LO , RF and OUTPUT. You can see the inputs mix and produce a difference (lower frequency) output.
I added an inductor in each input leg with no ill effect.
When I "LINK" the inductors the output is lost.
So the point is this.
The LO is producing millvolts of signal and the RF is microvolts so we must prevent the LO feeding the antenna connection.
What can we do?