[time-nuts] Optimal oscillator topology for diffrent frequency range

[Richard (Rick) Karlquist]

Agreed, for low phase noise FLOOR, it is imperative to
take the signal out through the crystal.  However, for
close in noise (say ADEV at t=1), the Driscoll has
worked well for me.  I have been able to reach ADEV
= 10^-11 at 100 MHz at using suitable resonators.

Rick

On 2/6/2017 4:35 AM, KA2WEU at aol.com wrote:
> Not quiet, using the crystal also as filter gives much better numbers ,,,,,
> 73 de Ulrich N1UL
>
> In a message dated 2/6/2017 7:30:33 A.M. Eastern Standard Time,
> richard at karlquist.com writes:
>
>     I would say the 2 stage "Driscoll" oscillator is the
>     way to go.  I have had good luck with it up to 100 MHz.
>     The first stage has the crystal in series with the
>     emitter, but is otherwise a grounded emitter stage.
>     The second stage is in cascode as a grounded base.
>     The important operating condition is that only
>     the second stage limits.  First publications on
>     it were in the early 1970's (search Michael Driscoll).
>
>     Rick Karlquist N6RK
>
>     On 2/6/2017 1:06 AM, Yeti Yetos wrote:
>     > Good morning,
>     > What's the optimal  oscillator topology for low phase noise (low
>     frequency
>     > noise and phase noise floor) for  25Mhz/50Mhz/100Mhz frequency
>     range.?
>     >
>     > Best regards, Rafal
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