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cadence AMS simulation accuracy problem

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lanesu

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Dear all, I met a problem when doing mix signal simulation by using cadence AMS simulator.
In AMS, E2L is usually used. it uses event trigger method to get a fast simulation speed.
But simulator often gets error results especially when I use ultra sim(spectre is better but simulation speed is much slower).
Does anyone have experience on this problem? How can I get a fast simulation speed without this problem?
 

Can anyone help me?
Does anyone have experience on cadance ams simulation?
I have tried specter and error is still there.
 

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