On Fri, 18 Feb 2022 11:56:02 +0100
Magnus Danielson via time-nuts <[email protected]> wrote:
> I think you have yourself a digital TCXO controller. Those use a
> tempsensor, use the reading to calculate the compensation and the use a
> normal varactor control to steer the frequency.
Quick side note: On modern, cheap TCXO systems, expecially those
for RTCs, frequency control is being done by a bank of switched
capacitors. This is mostly because capacitors can be implemented
in a standard digital CMOS process (or analog CMOS process).
A varactor, on the other hand, would need a special doping
profile (high-doping concentration with an abrupt transition).
Or in other words an additional half a dozen processing steps
which cost a lot of time and money... especially for a single
diode on a chip.
Attila Kinali
--
The driving force behind research is the question: "Why?"
There are things we don't understand and things we always
wonder about. And that's why we do research.
-- Kobayashi Makoto
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