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Accuracy of Glitches Observed in Transient Simulation

anurans

Hi,

I am performing a transient simulation on standard cell based design in transistor level using spectre (IC6.1.7). At the moment I use APS with ++aps, liberal settings without post Layout-Optimizations in ADE. When I run the simulation for longer time periods (i.e. 3us), I see glitches at certain points and I do not see them when running it for shorter periods (i.e. 100n).

The observation is same for the conservative mode. Is it related to the simulation step size (this is default settings though)? Is there anyway to decouple the simulation time from the accuracy ?

Thanks & Regards

Anuradha

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  • Andrew Beckett

    That is a very hard question to answer without knowledge of the circuit. There are some things in the simulator which are dependent upon the duration of the simulation - maxstep is one, but that is not usually an issue for most real circuits. There are a few others related to transition times - but this is all guesswork without knowledge of the circuit.

    I suggest you contact customer support.

    Regards,

    Andrew.

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  • Andrew Beckett

    That is a very hard question to answer without knowledge of the circuit. There are some things in the simulator which are dependent upon the duration of the simulation - maxstep is one, but that is not usually an issue for most real circuits. There are a few others related to transition times - but this is all guesswork without knowledge of the circuit.

    I suggest you contact customer support.

    Regards,

    Andrew.

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