Terje Mathisen wrote:
Depending upon the cut, quartz crystals can be more or less
temperature-sensitive, so it is in fact possible to get one that will
wander less when the surrounding temperature changes.
AT cut at ~10MHz has best performance.
A TCXO avoids the problem, as you noted, by having a
thermostat-controlled oven which keeps the temperature more or less
constant.
The most energy-efficient approach is to have a tiny temperature sensor
on or near the crystal, then use a sw lookup table to compensate for
temperature swings.
OCXO Oven Controlled ...
TCXO Temperature Comensated ...
TCXOs have made quite a rise in the last decade.
(you can't use an oven in a demand powered device like
GPS or mobile phone )
uwe
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