HI As long as you have a really poor crystal oscillator (wide band loop) they are quite easy to lock. If you have a high performance crystal oscillator (high Q / narrow band loop) they are relatively difficult to lock. If you are trying to *guarantee* a lock bandwidth and *guarantee* a level of performance they are not an easy way to go. A PLL probably will do what you want with a lot fewer headaches.
If you want absolute super performance multiplying, then by all means go with the approach. Plan on building a very good OCXO and then having it guarantee good locked performance over a really narrow ( think ppb to less than ppb) sort of range. Bob On Jul 19, 2014, at 4:45 PM, paul swed <[email protected]> wrote: > Attilla I did look at some of the documents. But none showed practical HF > class injection locking. Say as an example a 6 MHz xtal to a 1 or 2 MHz > reference. > It maybe as easy as a single transistor in the oscillators ground lead. > Always on till a brief pulse from the 1 or 2 MHz ref cuts it off. I think I > just talked myself into an attempt. > Regards > Paul > WB8TSL > > > On Sat, Jul 19, 2014 at 7:23 AM, Attila Kinali <[email protected]> wrote: > >> On Tue, 24 Jun 2014 21:18:20 +0200 >> Francesco Messineo <[email protected]> wrote: >> >>> what would be the best method to try injection locking a butler common >>> base crystal oscillator (see figure in >>> http://www.eska.dk/oscillator_data.htm for schematic)? >>> Any comment about close-in phase noise performance when adding >>> injection locking to such oscillators? >>> Thanks in advance for any hint. >> >> Moin, >> >> I cannot give you performance data, but i can point you at some papers >> that deal with injection locking. >> >> Probably one of the best known papers is from Robert Adler[1]. >> It mainly deals with how locking comes to be, what the conditions >> for locking are and how to calculate those. >> >> The other big name in injection locking is Kurokawa Kaneyuki. >> His first paper [2] deals, as the title suggests, with noise in >> coupled oscillators vs noise in single oscillators. >> His second paper [3] deals with injection locking itself, similar >> to what Adler did, but with a more "modern" terminology, but also >> with more math. >> (There are more papers from him on this topic, but i have not had >> time to read those) >> >> Chang et al. did a nice work on locking of multiple oscillators in [4] >> and how coupling directions affect them. >> >> Razavi did a nice rework of earlier findings on injection locking in [5]. >> In my opinion, this has one of the easier understandable math in all the >> papers i've read on injection locking. Also his liberal use of graphs >> simplify the interpretation of the formulas. >> >> Zhang et al. did a quite nice analysis of noise behavoir of coupled >> oscillators in [6]. But my main reason for mentioning it here is >> the measurements they made, which might give you an indiciation on where >> you might end up with your circuit. >> >> If you are more on the simulation side, [7] might give you a point to >> start how to model injection locking in spice (though, i must say that >> is one paper i stumbled upon and probably not the best in that area). >> >> HTH >> >> Attila Kinali >> >> >> [1] "A Study of Locking Phenomena in Oscillators", by Robert Adler, 1946 >> reprinted in Proceedings of IEEE October 1973 >> >> [2] "Noise in Synchronized Oscillators", by Kurokawa Kaneyuki, 1968 >> >> [3] "Injection Locking in Microwave Solid-State Oscillators", by Kurokawa >> Kaneyuki, 1973 >> >> [4] "Phase Noise in Coupled Oscillators: Theory and Experiment", >> by Chang, Cao, Mishra and York, 1997 >> >> [5] "A Study of Injection Locking and Pulling in Oscillators", by Behzad >> Razavi, 2004 >> >> [6] "A Theoretical and Experimental Study of the Noise Behavior of >> Subharmonically Injection Locked Local Oscillators", by Zhan, Zhou, >> and Daryoush, 1992 >> >> [7] "Capturing Oscillator Injection Locking via Nonlinear Phase-Domain >> Macromodels", >> by Lai and Roychowdhury, 2004 >> >> -- >> I pity people who can't find laughter or at least some bit of amusement in >> the little doings of the day. I believe I could find something ridiculous >> even in the saddest moment, if necessary. It has nothing to do with being >> superficial. It's a matter of joy in life. >> -- Sophie Scholl >> _______________________________________________ >> 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. _______________________________________________ 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.
