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How to calculate phase noise from transient noise run of an RC oscillator

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Hi, 

we have quite a noisy osc for app. 65MHz, and we are not sure if pss and pnoise results are 100% correct (like using lorentzian setting or not). So we run a long tran noise simulation, and can e.g. plot period jitter vs time (or cycle). But how to get phase noise from this time domain data? Can I do it within Cadence?

Best regards Stephan


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