Comment by RossBencina
3 days ago
out of interest, what would the physical setup look like? Hard to imagine you could achieve isotropic temperature approaching +/- 0.01 degree over the size of a typical PCB.
3 days ago
out of interest, what would the physical setup look like? Hard to imagine you could achieve isotropic temperature approaching +/- 0.01 degree over the size of a typical PCB.
Does it have to be isotopic though? The temperature must be constant over time, but a spatial gradient shouldn’t influence the stability of the crystal.
BTW, checkout my other comment in this thread about a GPSDO PCB with a resistor grid on the backside to evenly heat it.
A spatial gradient between the crystal and the temperature sensor, if it varies, can cause an error.
But is the error constant or does it vary over time? If it's the former, it can be calibrated away. If it's the latter, what is the mechanism behind it?
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