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Noise Aware PLL Design Flow

Hello! Faced with problem of LPF model. At pllmmlib it looks like a cell but how can i set it's parameters? Besides it has only two ports but LPF can have three ports what should i do in this case?

Thanks in advance!

BR,

Denis

Tawna over 10 years ago

Hi Denis,

Just so you are aware, the PLL Noise Aware flow has been "end of lifed" (no longer supported) for some time now.

You didn't mention the version of Spectre and Virtuoso that you were using. Always good to provide that information when submitting a question to the Cadence RF forum.

virtuoso -W

spectre -W

commands typed into an xterm will give this information.

best regards,

Tawna
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DenAk over 10 years ago

Thank You for fast reply! I use IC5.1.41 and MMSIM7.2. Are there any alternative ways of pll analysis? And could you please explain how to define an LPF? Could it be extracted in the same manner as VCO or PFD-CP? I understood it's no longer supported but for educational purpose it would be a good example of using behavioural models .

Regards,

Denis
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Andrew Beckett over 10 years ago

Nowadays we're generally advocating using a phase-domain model approach for fast PLL simulation and analysis of the stability and noise in the loop. See the PLL Workshop on

Note however that the database for this example is assuming IC616 and MMSIM13.1 or MMSIM14.1

Another idea would be to look at Predicting the phase noise and jitter of PLL-based frequency synthesizers

Regards,

Andrew.
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DenAk over 10 years ago

Thank you Andrew! Hope it helps me! Best Regards, Denis
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