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, [email protected] 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, [email protected] 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 > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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