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UltraSim DC convergence problem

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hmsheng

hmsheng

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Does anyone use UltraSim for PLL simulation?
DC convergence problem occurs when I use UltraSim to run a PLL simulation.
DC simulation can converge with Spectre simulator but can't with UltraSim.
How to solve this problem?
 

Hi,

Do you use any verilogA block in your PLL circuit?
If your circuit is pure active elements or res|cap, maybe the structure has a problem.

Added after 1 minutes:

By the way, what is the version of your Ultrasim?
The new version is more stable.
 

The version of UltraSim I used is 6.0.1.73
Is there new version available now?
 

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