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Save state from transient and use it for initial AC conditions

tobiasedstrom

Hi,

I have a large circuit with long startup time. I am running a transient simulation until the system has reached steady state (LDOs are up and running etc), then i start an AC simulation at a predefined time using the ?actimes and ?acnames parameters.  

The problem is that this is not very efficient, since the transient takes a long time, and the AC is rather quick. If i could run the transient once, save the state and then be able to run the AC from there, i would save a lot of time. 

How can i save the state from the transient, read the state and use it as a start state for my AC simulation? I am using spectre version -17.1.0.307.isr6. 

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  • Andrew Beckett

    You can use the savetime and savefile options for transient (on the State File tab of the tran options form in ADE) to pick the transient time to save the info at, and then use tran with the recover field to give it the state file to recover from. It will then start the transient as if it was continuing from the point at which it was saved, which should significantly reduce the time it takes.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    You can use the savetime and savefile options for transient (on the State File tab of the tran options form in ADE) to pick the transient time to save the info at, and then use tran with the recover field to give it the state file to recover from. It will then start the transient as if it was continuing from the point at which it was saved, which should significantly reduce the time it takes.

    Regards,

    Andrew.

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