[time-nuts] cheap 5V OCXO in 14DIP has about 1E-9 drift per day

[Magnus Danielson]

On 04/17/2011 09:13 PM, Bruce Griffiths wrote:
> As long as the divisor isnt too large such behaviour doesnt happen.
> When the divisor is too large and the filters detune too far then stable
> operation may not be possible.
> Until recently the reason for the demonstrated stability of regenerative
> dividers has been poorly understood.
> Non linear analysis is required as a linear analysis can lead to
> conclusions that conflict with the observed characteristics of a
> regenerative divider.
> To understand the stability requirements one has to examine the
> transient response and the phase portrait of the signals involved:
>
> http://www.its.caltech.edu/~kaushiks/KS_RFIC.pdf
> <http://www.its.caltech.edu/%7Ekaushiks/KS_RFIC.pdf>
>
> http://www.its.caltech.edu/~kaushiks/KS_TCAS.pdf
> <http://www.its.caltech.edu/%7Ekaushiks/KS_TCAS.pdf>
>
> In practice the behaviour of regenerative dividers is sufficiently
> stable and well established that they are being considered for use in
> various atomic frequency standards by NIST and others.

Thanks for the good links. The TCAS paper contains the goodies.

Cheers,
Magnus