[time-nuts] New very small OCMO

[Bob kb8tq]

Hi

Ovenized MEMS oscillators have been around for quite a while. They go back at 
at least a decade and likely quite a bit further. 

Bob

> On Nov 16, 2018, at 12:03 PM, Chris Caudle <chris at chriscaudle.org> wrote:
> 
> I did not see any mention of this on the list.  Could be interesting in
> some contexts:
> https://www.sitime.com/company/news/press-release/sitime-launches-emerald-platform-game-changing-mems-timing-solution-5g
> 
> An oven controlled MEMS oscillator.  I saw a sample recently, the idea
> seems to be to take a small MEMS based temperature compensated oscillator
> circuit, and put it in a very small oven (9x7x6.5 mm).  Because the
> circuit already has temperature compensation (pretty intrinsic to MEMS
> designs) the oven control does not have to be quite so tight, giving some
> flexibility on size.
> It is not a direct replacement for an SC cut quartz, but in contexts where
> low power and small size is more important than lowest phase noise it
> could be very useful.  Stability and accuracy should be pretty reasonable
> (claimed as 5ppb), and the aging claims look good, although I do not have
> a good understanding of aging process in MEMS based oscillators, so I
> don't know how much faith to put in low aging claims  yet.  ADEV is quoted
> as "2e-11 ADEV at 10 sec under airflow."
> 
> -- 
> Chris Caudle
> 
> 
> 
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