[time-nuts] Phase-noise through mixer?

Bob Camp kb8tq at n1k.org
Mon Oct 17 19:13:15 EDT 2016


Simple answer is yes.

More complex answer gets into things like the noise of the mixer (not just it’s floor), 
the levels of the signals, noise being coherent rather than non-coherent, AM <-> PM
conversion and on and on ….


> On Oct 17, 2016, at 4:45 PM, Anders Wallin <anders.e.e.wallin at gmail.com> wrote:
> Hi group!
> Can someone help me with how phase-noise through a mixer is calculated?
> Let's say I connect a 1 GHz signal with -80 dBc/Hz PN (wrt. 1GHz carrier)
> at some offset to the RF port.
> I then connect a 900 MHz signal with also -80dBc/Hz PN (wrt. 900MHz
> carrier) at the same offset.
> I'm interested in the 100 MHz IF signal (naively, will it have -77 dBc/Hz
> PN wrt 100MHz? carrier?)
> (ofcourse there might be a noise-figure through the mixer also)
> thanks!
> Anders
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