A more practical offshoot of this concept is to subsample the 32 kHz oscillator at 128 Hz (ie a sampling phase detector) and use a slow loop to tune the 32768 kHz oscillator. The biggest problem here is that you have to have a tunable oscillator. Attempting to get around this by injection locking a non-tunable oscillator is probably not going to work very well, since the frequency tolerance is likely to be larger than the small amount of frequency pulling you can get with injection locking. Basically, if the oscillator tolerance is 0.01%, and it has a Q of >>10,000, it will be hit or miss depending on luck.
Rick N6RK Bruce Griffiths wrote: > Another approach is to divide the 10MHz by 5^7 (78125) and then use an > injection locked multiplier chain to generate 32768 Hz from the > resultant 128Hz output. > It may even be possible to do the 256x multiplication using a single > injection locked 32768Hz injection locked multiplier. > When designed correctly the close in phase noise of an injection locked > oscillator is determined by that of the injection source whereas the > phase noise floor is determined by that of the oscillator being locked. > To optimise the performance the oscillator to be injection locked should > be designed to facilitate injection locking. > > Bruce > > _______________________________________________ > 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.
