[time-nuts] Divider circuit for Rubidium Standard

[Bruce Griffiths]

The Phase noise floor (~-143dBc/Hz @ 1kHz) of the 10MHz output of that divider is about 17dBc/Hz higher than either the LTC6957-4 (demo board) or the Holzworth HX2410 (both ~ -160dBc/Hz @ 1kHz).All measured with a 10MHz +14dBm input signal.For offsets below a few Hz shielding of the circuitry from air currents and reducing temperature fluctuations experienced by the circuitry is essential for accurate phase noise measurements.

Bruce 


     On Wednesday, 6 May 2015 2:36 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
   

 

On 4/26/2015 3:51 AM, Bryan _ wrote:
> All:
>
> P
  I was looking at the project from David partridges web site 
http://www.perdrix.co.uk/FrequencyDivider/index.html

> -=Bryan=-                       
> _______________________________________________
>

This is a comparator based circuit.  This will give
you worse performance than just about anything else,
but it may be good enough anyway.

Rick Karlquist N6RK
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