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oscillation frequency estimate using harmonic balance

fishbed

 Hi,

 I am working on a crystal oscillator.  I want to estimate frequency pulling over temperature caused by circuit (excluding crystal).  I am looking at something around 0.01ppm/C level or less.  It takes too much time to use shooting mehod.  So I use harmonic balance to figure out oscillation frequency.  It gives good resulton 2ppm frequency pulling (matches my hand calculation).  But I do not know if 0.01ppm frequency pulling can be simulated by harmonic balance.  What parameters do I need to tighten?

 

The oscillator XIN and XOUT have small sinusoidal swing.  Not much harmonics at all.

Thank you in advance!


 

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