Plus the effect of a star quake when the crystalline crust rearranges
itself.
Somewhat analogous to a crystal jump.
Bruce
Bob Camp wrote:
Hi
Then there's the phase noise of the pulsar "oscillator" ....
-------------------------------------
For a simple crystal oscillator the two word answer might be "Leeson's model".
That of course is a cop out since it clearly defines multiple things that contribute to
phase noise.
Bob
On Mar 5, 2010, at 9:39 AM, Richard (Rick) Karlquist wrote:
Don Collie jnr wrote:
I`m not sure that questions like these is welcome on this list, but here goes
anyway : 1/ What are the the 10 sources of the most constant [invariant]
frequencies known to man, in order of decreacing constancy? Four immediately
come to mind.
I vaguely remember reading that pulsars have some fantastic
stability like 1E-20. I don't remember how they established
this.
2/ What is the mechanism in an oscillator, that is responsible for phase noise?
[In only one sentence please]
Thermal (Johnson) noise in the resonator and thermal and shot noise in the
active device.
If this is known, then it becomes easier to design low phase noise oscillators.
Perhaps, but just knowing the mechanism doesn't tell you that the
phase noise is inversely proportional to loaded Q, which you would
also need to know to optimize phase noise.
I hope you enjoy these questions,.................................Don.
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