[time-nuts] xtal oscillator phase noise, parallel versus series

Didier Juges didier at cox.net
Wed Jan 2 11:26:47 EST 2008

I think the main difference between parallel and series resonance is that in parallel resonance mode, the capacitance of the crystal holder and wiring to the crystal is part of the frequency determining parameters, and in series mode it is not. So it may have a slight effect on temperature stability (series would be better?) but it should have no other effect. 

If the parasitics are well controlled, it should have the same stability.

The crystal is operating the same way, at a slightly different frequency, so if you had it specified for a series mode, you would be on the wrong frequency if you put it into a parallel resonant mode oscillator..

Didier KO4BB

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