>
>    "if I have a strong 60 MHz clock that
>     is rectifying in a junction"
>
> THAT takes a lot of 'leakage' from a 'box' to do that.
>
> I rather doubt this condition is ever experienced in real
> life ...
>

Actually that is quite common.  It is the principal of the Bose
detector.

http://www.tuc.nrao.edu/~demerson/bose/bose.html

With modern high performance op amps it is becomming more of a problem.
At the operating frequency (audio or sonar) the op amp can close the
loop so it operates with a tiny input and in its linear range.  But if
an RF signal can apply 1mV of differential signal to the input, and it
is too fast for the feedback loop to handle, but the op amp front end is
fast enough to amplify it, then the middle and output sections of the op
amp will go non-linear and cause distortion of legitimate signals the
are being amplified at the same time.

Sherpa Doug

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