On 02/26/2012 05:20 PM, Bob Camp wrote:
Hi
The paper mentions HC-40 crystals. They probably have the crystal drive current
cranked down to optimize short term stability at 1 sec and longer. The phase
noise floor takes a back seat.
The other interesting thing in the paper is that the short term numbers shown
aren't into parts in the 13th.
Come to think of it, I never saw a good explanation as to why the
crystal drive current really has this effect. I can only seem to recall
hand-waving and experience show stuff. Could be I read it but forgot
about it as I don't design crystal oscillators, only tend to use the
once that others have designed and built for me.
Cheers,
Magnus
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