[time-nuts] Method for comparing oscillators

Rex rexa at sonic.net
Wed Aug 5 01:08:23 UTC 2009


Thanks, everyone!

-Rex

Bruce Griffiths wrote:

>Lux, Jim (337C) wrote:
>  
>
>>>-----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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>>  
>>    
>>
>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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>  
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