On 11/8/2010 9:04 AM, Poul-Henning Kamp wrote: > But since I happen to have access to much more stable frequencies > than voltages, I thought of a different way: > > 1. Mount a X-tal-osc with really lousy tempco inside the enclosure. > > 2. Compare its output to a stable reference frequency. > > 3. Use the output of the phase comparator to drive the Peltier. > > It is basically a PLL where temperature is used as EFC... > > Has anybody tried that ? It's been my experience that oscillators with really lousy temperature performance have really lousy repeatability as well. I'm never delved into why this is true, but I suspect it's a number of things and not limited to the quartz resonator.
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