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How to set different accuracy settings for different time periods in transient simulation.

vamshiky

Hi,

 

I have a circuit which takes some 10us for the initial transients to settle and reach a steady state.

Just wondering if can reduce the simulation accuracy to 'moderate'  during the initial times and later make it 'conservative' after reaching the steady state.


Is it doable using spectre simulator?

 

Thanks,

Vamshi

 

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  • Andrew Beckett

    Hamid,

    Using uppercase in the name wouldn't have worked anyway because spectre is case-sensitive. 

    To control the maximum timestep, you'd just use maxstep (not maxsteps) as the parameter. This works in both tran and pss analyses (I tested it).

    However, in general I can't see too many reasons to change this dynamically. The primary use of maxstep is to set it tightly to force time steps to get an oscillator to start more rapidly; once the oscillator is up and running it would probably take those time steps anyway. It is rather a blunt instrument to control accuracy, if that was your intent, and there are better ways to perform that than forcing the maximum timestep.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Hamid,

    Using uppercase in the name wouldn't have worked anyway because spectre is case-sensitive. 

    To control the maximum timestep, you'd just use maxstep (not maxsteps) as the parameter. This works in both tran and pss analyses (I tested it).

    However, in general I can't see too many reasons to change this dynamically. The primary use of maxstep is to set it tightly to force time steps to get an oscillator to start more rapidly; once the oscillator is up and running it would probably take those time steps anyway. It is rather a blunt instrument to control accuracy, if that was your intent, and there are better ways to perform that than forcing the maximum timestep.

    Regards,

    Andrew.

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