Microwave phase detection at the level of 10-11 rad

Ivanov, Eugene N.; Tobar, Michael E.
April 2009
Review of Scientific Instruments;Apr2009, Vol. 80 Issue 4, p044701
Academic Journal
We report on a noise measurement system with the highest spectral resolution ever achieved in the microwave domain. It is capable of detecting the phase fluctuations in rms amplitude of [formula] at Fourier frequencies above a few kilohertz. Such precision allows the study of intrinsic fluctuations in various microwave components and materials, as well as precise tests of fundamental physics. Employing this system we discovered a previously unknown phenomenon of down-conversion of pump oscillator phase noise into the low-frequency voltage fluctuations.


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