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

Richard (Rick) Karlquist richard at karlquist.com
Wed Jan 2 11:45:16 EST 2008


I forgot to mention that the crystals for the E1938A had to
be calibrated for series resonance at 10 MHz.

Rick Karlquist N6RK

Didier Juges wrote:
> 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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