Thanks, everyone!
-Rex
Bruce Griffiths wrote:
Lux, Jim (337C) wrote:
-----Original Message-----
From: [email protected] [mailto:[email protected]] 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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The first 2 are the relevant patents.
You may also find it useful to download the 5125A manual.
This instrument uses subNyquist sampling together with a bank of
switched antialiasing bandpass filters to compare 2 sources over the
1-400MHz frequency range.
There may be additional patents pending for this.
Bruce
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