[time-nuts] Method for comparing oscillators

Lux, Jim (337C) james.p.lux at jpl.nasa.gov
Wed Aug 5 00:15:38 UTC 2009


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bruce Griffiths
> Sent: Tuesday, August 04, 2009 5:06 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Method for comparing oscillators
> 
> > http://www.uspto.gov/
> >
> > patent search
> > quick
> > symmetricom in "Assignee Name"
> >
> >
> Actually Timing Solutions corp would be better choice of assignee as
> they developed the concept until swallowed/absorbed by Symmetricom
> 
> Bruce
> 
1 	7,436,166 	Full-Text 	Direct digital synthesizer producing a signal representing an amplitude of a sine wave
2 	7,227,346 	Full-Text 	Two channel digital phase detector
3 	5,315,566 	Full-Text 	Time scale computation system
4 	5,155,695 	Full-Text 	Time scale computation system including complete and weighted ensemble definition

The second one, to Wayne Solbrig, looks interesting.

The present invention is directed to a digital phase detector that is capable of being used in a phase measurement system to make very low phase noise measurements and, in one embodiment, as low as about 180 dB/Hz below the carrier frequency


It would appear that some folks from Cal Tech and JPL, have used a similar technique in 7,511,469, for measuring small changes in laser frequencies.





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