On 06/01/2013 05:21 PM, Bob Camp wrote:
Hi
The electronics in an SC based OCXO will be different from the "stuff"
in an AT based part. At the very least you need additional traps for
the SC. You also need to do something to accommodate it's significantly
higher resistance. On the plus side, the SC probably can take 4X higher
drive than the AT for a given amount of delta frequency / delta drive.
Again, something that will impact the circuit.
Notice that BVAs can be driven at a significantly higher power, if one
should believe the articles I referenced.
Far more significant than any of that - marketing may well have asked
that the part be optimized in a different way so it would sell better.
Phase noise often seen as a better "bragging rights" spec than ADEV.
A difference could be exaggerated in the specing of them, which may be a
way to differentiate the market between the products, such that the
cheaper product does not eat out too much of the market of the more
expensive product, even if the actual difference isn't as large.
My personal opinion is that this bias is driven more by the fact that
fewer people understand (or trust) ADEV and it's derivatives.
They can be a bit difficult to interpret if you have not been taught
properly on them. It is interesting that either folks look at phase
noise or ADEV, but few seems to be looking at both sides of the coin,
depending on what they are doing.
Cheers,
Magnus
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