[time-nuts] Over optimistic PN measurements

bruce at ko4bb.com bruce at ko4bb.com
Tue May 27 10:31:52 UTC 2014

There has been some controversy over the Phase noise of CMOS logic devices.
Perhaps the apparently anomalously low PN measures are due to the use of cross
correlation in the phase noise measurement equipment and the occurrence of
phenomena detailed in the recent NIST papers:



Such collapse of the cross-spectral function may also be present in the PN plots
shown in the datasheets for some OCXOs.


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