[time-nuts] Temperature controlled TCVCXO

[Tim Shoppa]

https://www.google.com/patents/US6166608 "Thermo-electric cooled oven
controlled crystal oscillator "

http://www.google.com/patents/US8653897  "Devices, systems, and methods for
controlling the temperature of resonant elements "


On Fri, May 13, 2016 at 4:15 AM, David <davidwhess at gmail.com> wrote:

> Has anybody tried using a thermoelectric cooler to maintain a TCVCXO
> at a constant temperature in lieu of using an OCXO?
>
> I was thinking about this after reading some application notes in
> connection with constant temperature control using TECs with bipolar
> drive.  The power required would be pretty low so I think a linear
> control circuit could be used avoiding the noise problems associated
> with a switching controller.  Temperature sensor placement would be a
> challenge.
>
> I suppose as part of an automated calibration, the temperature could
> be adjusted over a few degrees from ambient to find any flat spots in
> the oscillator's ppm/C curve.
>
> One place I have run across this application of TECs is with laser
> diodes where coherence length depends on very tight temperature
> control.  Typical laser diodes without temperature control have a
> coherence length of millimeters making them useless in more demanding
> applications like interferometry.
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