[time-nuts] Phase-noise through mixer?

Richard (Rick) Karlquist richard at karlquist.com
Mon Oct 17 21:09:13 EDT 2016


Mixers also have the curious phenomenon of non-reciprocity

On 10/17/2016 4:13 PM, Bob Camp wrote:
> Hi
>
> 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 ….
>
> Bob
>
>
>
>> 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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