[time-nuts] Ultra low phase noise floor measurement system for RF devices.

[Dr Bruce Griffiths]

Said
> Actually I should have said -200dBc/Hz.
> With a +13dBm carrier this corresponds to a noise voltage of 100pV/rtHz 
> across a 50 ohm resistor or a noise current of 2pA/rtHz  flowing through it.
> Even with a 1Hz noise bandwidth thats an rms fluctuation of about 
> 12,500,000 electrons. You have to get down to noise currents of  around 
> 1attoAmpere/rtHz before you start "counting" individual electrons.
>
> Yes vibration isolation, is essential which is why their prototype was 
> built on a vibration isolated optical table.
>
> Bruce
>
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>   
Oops!
I meant 12,500,000 electrons/sec.
Bruce