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!