[time-nuts] locking oscillators - an increase in power and/or stability ?
Dr. David Kirkby (Kirkby Microwave Ltd)
drkirkby at kirkbymicrowave.co.uk
Wed Oct 8 16:46:27 EDT 2014
On 8 Oct 2014 20:26, "Bob Camp" <kb8tq at n1k.org> wrote:
> It’s called injection locking. The two oscillators (or what ever) lock up
at exactly the same frequency and some arbitrary phase. Depending on the
amplitude and phase at the sum point, the result can be anything from +6 db
to zero power. Anything that oscillates can injection lock if given the
right feedback at the right point.
> The gotcha is that they are at the same frequency, so they add as
voltages rather than power. In phase, equal amplitude, you get 6 db more
power. Exactly 180 degrees out of phase and exactly equal power and you get
nothing (no power at all) at the sum point. Off by a fraction of a degree
or a fraction of a db and you still get roughly 6 db in the zero degree
But while voltages could double, that is not going to happen if something
limits the current.
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