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[help] pll simulation in spectre

reddevil011 over 11 years ago

I am trying to run a PSS analysis of a closed-loop PLL in spectre, but encounter converge problems.

Is it possible to run a PSS analysis of a closed-loop PLL?

thanks!

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Andrew Beckett over 11 years ago

Yes, this is possible - but it can be difficult if you have a large divide ratio. It's also only possible for integer-N PLLs (not Fractional PLLs).
See some discussion of this in Predicting the phase noise and jitter of PLL-based frequency synthesizers
Regards,
Andrew.
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Andrew Beckett over 11 years ago

Yes, this is possible - but it can be difficult if you have a large divide ratio. It's also only possible for integer-N PLLs (not Fractional PLLs).
See some discussion of this in Predicting the phase noise and jitter of PLL-based frequency synthesizers
Regards,
Andrew.
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