[time-nuts] AMC-123 patent

Brooke Clarke brooke at pacific.net
Sat Feb 20 21:23:22 UTC 2010

Hi Rick:

Thanks for the patent number.
High-Dynamic-Range Amplifier, David E. Norton, Adams-Russell, Nov 30, 
1971, *330/53* ; 330/293; 330/295; 330/68

Have Fun,

Brooke Clarke

Rick Karlquist wrote:
> Bruce Griffiths wrote:
>> Rick Karlquist wrote:
>>> Bruce Griffiths wrote:
>>>> He's made similar comments before.
>>>> It actually isnt that difficult to achieve an isolation amplifier phase
>>>> noise floor below -170dBc/Hz if one is careful to use appropriate
>>>> parts,
>>>> design techniques, and the input signal level is high enough.
>>>> The real problem is verifying that performance.
>>> The 10811 production engineers searched for a long time for
>>> a low noise buffer amplifier and settled on the ANZAC AMC-123.
>>> The data sheet refers to a patent that reads like
>>> a construction article.  You can make your own if you can find
>>> an old 2N5109 transistor.
>>> Rick Karlquist N6RK

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