[ARC5] Drift in LC oscillators (and particularly the BC-453 series)

[Scott Robinson]

and Scott remarks:

If you think of an oscillator as an amplifier and a tuned circuit, noise 
in the amplifier part maps to jitter directly. In digital audio hardware 
design, jitter is important as it maps to noise in the output, so clock 
design for minimum jitter is important.

The commonly used digital design of using a logic gate biased to its 
center point as the amplifier in a crystal oscillator generates high 
jitter for this very reason.

FWIW,

Scott Robinson



On 12/19/17 3:37 AM, Leslie Smith wrote:
>    
> 
> I make a few brief comments about oscillator stability.
> 
> (1)  My comments are based on direct experience building (and monitoring) home-brew analog VFOs.
> 

> 
> (4)  Looking at the frequency of an oscillator over an interval of 10 seconds or so (this is the shortest period available to "count" frequency to a resolution of 0.1Hz at a few MHz) I see "jitter".  Either my oscillator is "noisy" or the counter is noisy (or both are noisy).  For a long time I have suspected that there is a relationship between the Gaussian distribution of observed "jitter" and the longer-term stability.  If anyone has a handle on how the two are related, I would like to know.  I suspect if this relationship is known, then the longer term stability can be estimated in a shorter time.  Any-one here know the maths?