aaron_do wrote on Nov 24th, 2009, 8:00am:I didn't quite understand question (1).
You observe IF output of "LNA+Mixer" in the conditions of the followings ?
- RF is no signal feed with termination of 50ohm
- LO is drived at some frequency by signal generator
aaron_do wrote on Nov 24th, 2009, 8:00am:I suppose that rules out noise on the ground node right?
What do you mean ?
aaron_do wrote on Nov 24th, 2009, 8:00am:In neither case was the 3.5 MHz noise signal affected.
What do you mean ?
You mean spike at 3.5MHz never disappear in any case ?