[time-nuts] NCOCXO anyone?
Richard (Rick) Karlquist
richard at karlquist.com
Fri Jul 22 14:23:35 EDT 2016
On 7/22/2016 10:15 AM, David wrote:
> It is too bad voltage control of an oscillator cannot be made
> ratiometric. Or can it? I have never heard of such a thing. That
> would remove some of the demands on a low drift reference.
That's what we tried to do with the E1938A. A multiplying DAC
is used based on a reference that is ovenized instead the
crystal oven. That certainly eliminated the tempco issue
with the reference, but then we discovered 1/f noise on the
reference. We had to redesign with a different reference.
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